PORTABLE SENSOR CONTROL SYSTEM FOR MONITORING CEREBRAL HEMODYNAMIC PARAMETERS

Abstract

The invention relates to a portable sensor control system (10) for monitoring the cerebral hemodynamic parameters of a user's head. The system (10) comprises at least one sensor device (20). Each of the at least one sensor device (20) comprises at least one red light emission module, at least one infrared light emission module, at least one light sensor, an emission control module, a power supply module, and a sensor communication module. The system (10) also comprises a control device (40). Said control device (40) comprises the control communication module (46). The control device (40) is remote from the at least one sensor device (20), and the sensor devices (20) are remote from each other. Figure to be published with the abbreviation: Fig 1

Description

Title of the invention: PORTABLE SENSOR CONTROL SYSTEM FOR MONITORING CEREBRAL HEMODYNAMIC PARAMETERS Technical field

[0001] The present invention relates to a portable sensor control system for monitoring cerebral hemodynamic parameters. Previous technique

[0002] Functional near-infrared spectroscopy (fNIRS) offers an opportunity to study human brains in everyday activities and environments. However, obtaining robust measurements under these dynamic conditions remains a challenge. The Modular Optical Brain Imaging (MOBI) system, as described in Hasan Ayaz et al., Continuous monitoring of brain dynamics with functional near-infrared spectroscopy as a tool for neuroergonomic research: empirical examples and a technological development, is designed to improve the coupling between the optode and the scalp and provide a real-time estimation of the probe's three-dimensional shape to enhance the use of fNIRS in everyday conditions. The MOBI system uses a flexible and lightweight modular circuit board design to improve the probe's conformity to the head surface and comfort for long-term wear.Combined with automatic module connection recognition, the orientation sensors integrated into each module can be used to estimate the three-dimensional positions of the optodes in real time, thus enabling advanced tomographic data analysis and motion tracking. Despite these advances, integrating such systems into a portable and user-friendly format capable of providing reliable and accurate monitoring of cerebral hemodynamic parameters in various environments, including those with high movement, remains a technical challenge.

[0003] Although the MOBI system offers advances in the field of fNIRS, particularly in improving scalp coupling and real-time estimation of the probe's three-dimensional shape, the system may encounter limitations when deployed in demanding environments. For example, system performance could be affected by extreme variations in environmental conditions that may not be fully accounted for by the current design. Furthermore, the lightweight and flexible nature of the modular circuit board design, while advantageous for user comfort and probe conformity, may pose challenges in terms of durability and robustness when is subjected to rigorous physical activity or impacts. Furthermore, automatic module connection recognition and orientation sensors, while effective at estimating the three-dimensional positions of optodes, may require further improvements to ensure consistent accuracy and reliability in high-movement environments where rapid user movements could lead to potential misalignments or data inaccuracies. These factors underscore the ongoing demand for optimization of portable fNIRS systems to withstand the complexities of real-world applications while maintaining the accuracy of cerebral hemodynamic monitoring.

[0004] The invention thus aims to address at least partially the technical problems presented above. Description of the invention

[0005] The invention relates to a portable sensor control system for monitoring cerebral hemodynamic parameters of a user's head, the system comprising: - at least one sensor device, each of the at least one sensor device comprising: • at least one red light emission module, said red light emission module being configured to be positioned on the user's head and to emit light through the skin of the user's head; • at least one infrared light-emitting module, said infrared light-emitting module being configured to be positioned on the user's head and to emit light through the skin of the user's head; • at least one light sensor, said at least one light sensor being configured to detect the light emitted by the light-emitting modules and generate measurement data; • an emission control module, said emission control module being configured to control said at least one red light emission module and said at least one infrared light emission module as well as to receive measurement data from said at least one light sensor; • a power supply module, said power supply module being configured to receive power from a power source; • and a sensor communication module, said sensor communication module being configured to exchange data at least with the emission control module and a control communication module; - a control device, said control device comprising: • the control communication module, said control communication module being configured to exchange data at least with the sensor communication module; and • wherein the control device is remote from at least one sensor device and the sensor devices are remote from each other.

[0006] According to one embodiment, at least one of the sensor devices can be configured to be positioned elsewhere than on the user's head. For example, a sensor device can be designed to be placed on the neck, torso, arm, or any other part of the user's body. This alternative configuration allows for the monitoring of other physiological parameters in addition to cerebral hemodynamic parameters, thus providing a more comprehensive view of the user's health status. Placing a sensor device on another part of the body can also facilitate comparison between cerebral measurements and measurements taken elsewhere, which can provide valuable information on overall blood circulation and the user's physiological response to various conditions.

[0007] The technical effect of the remote control device for the sensor device is to improve the flexibility and adaptability of the portable sensor control system. This configuration can, for example, allow the separation of processing and control functions from data acquisition functions, which can lead to improved signal processing capabilities and more efficient energy management. By remote control, the system can minimize interference and noise that may be introduced by the proximity of the control electronics to the sensitive sensor elements.Furthermore, this separation can facilitate the placement of the sensor device in an optimal position on the user's head for data collection, while allowing the control device to be placed elsewhere on the user's body where it is less bothersome, thus improving user comfort and compliance with long-term monitoring.

[0008] In this document, the term "remote" refers to a physical separation, such as a physical separation between the control device and at least one sensor device, for example. This separation is intended to allow the control device to be placed in a different location on the user's body or in their environment, rather than being integrated into or attached directly to the sensing device itself. The remote configuration allows the control device to perform its functions without being subject to the same conditions. Environmental or motion factors are separated from the detection device, which can improve the accuracy and reliability of data processing and energy management. This separation also enhances user comfort by reducing the bulk or weight of the detection device on the user's head, as well as minimizing potential thermal effects from the control device's operation at the detector site.

[0009] The remote configuration of the control device relative to the sensor device also provides a technical benefit related to heat dissipation management. By physically separating the control device, which can generate heat during operation, from one or more sensor devices positioned on the user's head, the system can reduce the thermal load applied to the head area. This is particularly beneficial because the light-emitting modules themselves also emit heat in addition to light. Minimizing the user's head's heat exposure not only improves comfort but also prevents any potential thermal interference with cerebral hemodynamic measurements, ensuring more accurate and reliable data collection.

[0010] In the context of the portable sensor control system, the emission control module is a multimodal interface. This interface is configured to manage the operation of the red and infrared light emission modules, including the initiation and cessation of light emission, the wavelength of the emitted light, and the adjustment of the light intensity. Furthermore, the emission control module is responsible for receiving measurement data from at least one light sensor, which detects the light emitted by the red and infrared light emission modules. The multimodal capabilities of the emission control module allow it to process and integrate data from multiple sources, facilitating complete control of the light emission process and ensuring accurate data acquisition for monitoring cerebral hemodynamic parameters.

[0011] The portable sensor monitoring system is designed to monitor cerebral hemodynamic parameters using at least one sensor device comprising an array of light-emitting modules positioned on the user's forehead. These sensors emit light at predetermined wavelengths that penetrate the skin and brain tissue. The light emitted by the red and infrared light-emitting modules is partially absorbed by the blood in the brain tissue, and the unabsorbed light is reflected back to the surface where it is detected by the light sensor(s). Variations in light absorption indicate changes in hemoglobin concentration in the tissues. cerebral. Specifically, the system is capable of distinguishing between oxyhemoglobin and deoxyhemoglobin, which are markers of oxygenated and deoxygenated blood, respectively. By analyzing the differential absorption of light at the two wavelengths, the device can infer the relative concentrations of these hemoglobin species. The measurement data generated by the sensor device is transmitted to the remote control device for the reasons mentioned. The emission control module is responsible for interpreting the signals from the sensors to determine the user's health status and cognitive workload. This information can then be used to provide real-time feedback to the user, potentially alerting them to changes in cerebral hemodynamics that may require attention.

[0012] The inclusion of red and infrared light-emitting modules in the portable sensor control system improves the accuracy of hemodynamic measurements by exploiting the distinct absorption characteristics of oxyhemoglobin and deoxyhemoglobin at different wavelengths of light. Oxyhemoglobin, which carries oxygen, has a higher absorption at the infrared wavelength, while deoxyhemoglobin, which is depleted of oxygen, absorbs more red light. By emitting light at both red and infrared wavelengths, the system can simultaneously measure the absorption of each state of hemoglobin. This dual-wavelength approach allows for the calculation of the relative concentrations of oxyhemoglobin and deoxyhemoglobin in brain tissue, providing a more comprehensive and accurate assessment of cerebral hemodynamics.The ability to differentiate between these two hemoglobin states is particularly valuable for determining brain oxygenation, which is a direct indicator of brain health and function. Accurate measurement of these parameters is instrumental in monitoring cognitive workload and health status, thereby increasing the reliability of the data collected by the system.

[0013] In addition to monitoring cerebral hemodynamic parameters, the portable sensor control system is configured to measure heart rate using light sensors to detect pulsating changes in blood volume in brain tissue. As the heart beats, it induces rhythmic fluctuations in blood volume and, consequently, changes in the light absorption characteristics of brain tissue. These pulsating changes are captured by the light sensors as variations in the intensity of light reflected from the skin of the head and from the brain tissue.

[0014] The emission control module, which manages the operation of the red and infrared light emission modules, is also configured to process the pattern The system analyzes the time series of light signals received, corresponding to the cardiac cycle. By analyzing the time series data of light absorption, the system can extract the periodicity and regularity of blood volume changes, which are indicative of the heart rhythm.

[0015] The sensor communication module then transmits the heart rate measurement data to the transmission control module, which processes this data to determine the user's heart rate. The system can use algorithms to filter noise and improve cardiac signal detection, ensuring an accurate and reliable heart rate measurement. This heart rate data can be used to provide additional information on the user's physiological state and can be integrated with cerebral hemodynamic measurements to offer a more comprehensive assessment of the user's health status.

[0016] The relationship between blood volume in the head and heart rate is a dynamic physiological interaction where heart rate adjusts to maintain cerebral perfusion and overall circulatory homeostasis. When blood volume in the head is too high, potentially due to gravitational effects or postural changes, the body's baroreceptors—sensitive to changes in blood pressure—signal the heart to slow its rate. This decrease in heart rate, or bradycardia, allows blood to return to the body, thus reducing pressure and volume in the cerebral vessels. Conversely, when blood volume in the head is low, which can occur during rapid acceleration or deceleration, the heart rate increases to pump blood more efficiently to the head.This compensatory mechanism, known as tachycardia, ensures that the brain receives sufficient oxygen and nutrients by increasing blood flow to compensate for reduced cerebral blood volume. The ability of the wearable sensor control system to measure heart rate by detecting pulsatile changes in blood volume within brain tissue is therefore essential for monitoring the user's physiological state and maintaining cerebral hemodynamic stability.

[0017] According to one embodiment, each sensor device of the at least one sensor device includes a power supply, said power supply being configured to send power to the power module. Such an arrangement allows each sensor device of the at least one sensor device to be energy self-sufficient, thus allowing greater freedom of positioning on the user's head, and thus adapting more easily to the user's specific characteristics.

[0018] According to one embodiment, the control device includes a power supply, said power supply being configured to send power to the power module of each sensor device of at least one device of sensor. Such an arrangement allows the power source to be shared and thus facilitates user comfort by reducing the size or weight of the detection device on the user's head, while minimizing potential thermal effects.

[0019] According to one embodiment, at least one of the at least one sensor device includes an acceleration sensor, said acceleration sensor being configured to measure acceleration and generate acceleration data, and the emission control module is configured to receive the acceleration data.

[0020] According to one embodiment, the acceleration data also include gyroscopic data.

[0021] Including an acceleration sensor in the wearable sensor control system enhances the system's ability to monitor and analyze the user's physical movements and the associated physiological effects of those movements. The acceleration sensor is configured to measure the acceleration forces acting on the user's head, which can range from subtle movements to rapid changes in direction or speed. By generating acceleration data, the system can correlate these forces with cerebral hemodynamic parameters.

[0022] Static accelerations include gravity, allowing the sensor to determine the user's head orientation, while dynamic accelerations are related to movement and can indicate the onset of rapid maneuvers or impacts. The emission control module, which already manages the operation of the red and infrared light emission modules, is further configured to receive this acceleration data. This integration allows the system to account for motion artifacts in cerebral hemodynamic measurements, which can be particularly useful when monitoring pilots or individuals in high-movement environments.

[0023] Furthermore, acceleration data can provide valuable context for interpreting changes in cerebral blood flow and oxygenation. For example, an increase in cerebral blood volume may be associated with physical exertion, which can be confirmed by corresponding acceleration data. This additional layer of data enhances the system's ability to provide a comprehensive assessment of the user's physiological state, including the potential effects of physical activity or external forces on cerebral hemodynamics.

[0024] In summary, the inclusion of an accelerometer in the portable sensor control system provides a technical effect that improves the accuracy and reliability of the monitored cerebral hemodynamic parameters by taking into account the user's head movements and associated physiological responses. This allows for a more nuanced understanding of the user's health status and the cognitive load, particularly in dynamic or physically demanding environments.

[0025] According to one embodiment, at least one of the at least one sensor device comprises a temperature sensor, said temperature sensor being configured to measure temperature and generate temperature data, and where the emission control module is configured to receive the temperature data.

[0026] Including a temperature sensor in the portable sensor control system enhances the system's ability to monitor and analyze the user's head temperature and the physiological effects associated with temperature changes. The temperature sensor is configured to measure the temperature at the location where the sensor device is positioned on the user's head, which can vary due to environmental conditions, physical activity, or changes in cerebral blood flow. By generating temperature data, the system can correlate these temperature changes with cerebral hemodynamic parameters.

[0027] The ability to measure temperature provides valuable context for interpreting changes in cerebral hemodynamics. For example, an increase in head temperature may indicate an increase in cerebral blood flow or metabolic activity, which may be associated with cognitive exertion or stress. Conversely, a decrease in temperature may suggest reduced cerebral perfusion or exposure to a cold environment. The emission control module, which manages the operation of the red and infrared light emission modules, is further configured to receive this temperature data. This integration allows the system to account for the thermal effects on cerebral hemodynamic measurements, which can be particularly useful when monitoring individuals in varying environmental conditions or during physical exertion.

[0028] Furthermore, temperature data can be used to ensure the user's thermal comfort by monitoring potential overheating conditions that may arise due to prolonged use of the sensor device or exposure to high ambient temperatures. This additional data layer enhances the system's ability to provide a comprehensive assessment of the user's physiological state, including the potential effects of environmental temperature or body heat on cerebral hemodynamics.

[0029] In summary, the inclusion of a temperature sensor in the portable sensor control system provides a technical effect that improves the accuracy and reliability of the monitored cerebral hemodynamic parameters by taking into account the thermal state of the user's head. This allows for a more comprehensive understanding of the user's health status and cognitive workload, particularly in environments where temperature conditions vary or during activities that can affect body temperature.

[0030] According to one embodiment, at least one of the at least one sensor device comprises a humidity sensor, said humidity sensor being configured to measure humidity levels and generate humidity data, and where the emission control module is configured to receive the humidity data.

[0031] Including a humidity sensor in the wearable sensor control system enhances the system's ability to monitor and analyze humidity levels around the user's head and the physiological effects associated with changes in humidity. The humidity sensor is configured to measure humidity levels at the location where the sensor device is positioned on the user's head, which can vary due to environmental conditions, physical activity, or changes in perspiration rates. By generating humidity data, the system can correlate these humidity changes with cerebral hemodynamic parameters.

[0032] The ability to measure humidity provides valuable context for interpreting changes in cerebral hemodynamics. For example, increased humidity levels around the head may indicate increased perspiration, which could be associated with physical exertion or stress responses. Conversely, decreased humidity levels may suggest a drier environment or reduced perspiration. The emission control module, which manages the operation of the red and infrared light emission modules, is further configured to receive this humidity data. This integration allows the system to account for the effects of humidity on cerebral hemodynamic measurements, which can be particularly useful when monitoring individuals in varying environmental conditions or during activities that induce perspiration.

[0033] Furthermore, humidity data can be used to ensure user comfort by monitoring potential conditions that could lead to dehydration or heat stress. This additional layer of data enhances the system's ability to provide a comprehensive assessment of the user's physiological state, including the potential effects of environmental humidity or perspiration on cerebral hemodynamics.

[0034] In summary, the inclusion of a humidity sensor in the portable sensor control system provides a technical effect that improves the accuracy and reliability of the monitored cerebral hemodynamic parameters by taking into account the humidity levels around the user's head. This allows for a more comprehensive understanding of the user's health status and cognitive workload, particularly in environments where humidity conditions vary or during activities that can influence perspiration and hydration levels.

[0035] According to one embodiment, at least one of the at least one sensor device comprises a pressure sensor, said pressure sensor being configured to measure pressure and generate pressure data, and where the emission control module is configured to receive the pressure data.

[0036] Including a pressure sensor in the portable sensor control system enhances the system's ability to monitor and analyze pressure conditions in the user's environment and the physiological effects associated with pressure changes. The pressure sensor is configured to measure the pressure at the location where the sensor device is positioned on the user's body, which can vary due to environmental conditions such as changes in altitude, cabin pressurization, or rapid maneuvers in an aircraft cockpit. By generating pressure data, the system can correlate these pressure changes with cerebral hemodynamic parameters.

[0037] The ability to measure pressure provides valuable context for interpreting changes in cerebral hemodynamics. For example, a sudden drop in ambient pressure may indicate a rapid ascent or a decompression event, which can lead to hypoxia or other altitude-related physiological responses. Conversely, an increase in pressure may be associated with a descent or with the pressurization of the aircraft cabin. The emission control module, which manages the operation of the red and infrared light emission modules, is further configured to receive this pressure data. This integration allows the system to take into account the effects of pressure on cerebral hemodynamic measurements, which can be particularly useful when monitoring pilots or individuals in environments where pressure conditions are subject to change.

[0038] Furthermore, pressure data can be used to ensure the user's safety and well-being by monitoring potential hazardous conditions that may arise due to sudden pressure changes or prolonged exposure to suboptimal pressure levels. This additional data layer enhances the system's ability to provide a comprehensive assessment of the user's physiological state, including the potential effects of environmental pressure changes on cerebral hemodynamics.

[0039] In summary, the inclusion of a pressure sensor in the portable sensor control system provides a technical effect that improves the accuracy and reliability of the monitored cerebral hemodynamic parameters by taking into account the pressure conditions experienced by the user. This allows for a more complete understanding of the user's health status and cognitive load, particularly in environments where pressure conditions can change rapidly, such as during flight operations.

[0040] According to one embodiment, the emission control module is configured to calculate the cerebral hemodynamic parameters of the user's head based on the received data.

[0041] As used herein, the term “received data” refers to data acquired by the emission control module from various sources, including, for example, but not limited to, measurement data generated by the light sensor, acceleration data, temperature data, humidity data, and pressure data. Received data may include measurement data indicating the light absorbed and reflected by brain tissue, as well as any additional data such as acceleration data from the accelerometer. This data is processed and analyzed to calculate cerebral hemodynamic parameters and other physiological measurements relevant to the user's health status and cognitive workload.

[0042] Such a configuration allows each sensor device to autonomously calculate cerebral hemodynamic parameters, thereby decentralizing data processing and reducing the computational load on the control device. This autonomy improves system efficiency by enabling real-time processing at the data capture point, which is particularly advantageous in dynamic environments where rapid changes in cerebral hemodynamics can occur. By equipping each sensor device with the ability to calculate these parameters, the system can provide immediate feedback to the user and facilitate timely interventions. Furthermore, this configuration allows parallel processing between multiple sensor devices, potentially increasing the overall system data throughput and providing a richer hemodynamic dataset for comprehensive analysis.

[0043] Such a configuration also allows the portable sensor control system to create redundancy. The inclusion of redundancy in the design of the portable sensor control system provides a technical effect that improves the system's reliability and robustness. By incorporating several autonomous sensor devices, the system can continue to operate effectively even if one sensor device fails.

[0044] According to one embodiment, the emission control module is configured to generate an alert based on at least the calculated cerebral hemodynamic parameters.

[0045] According to one embodiment, the emission control module is configured to generate an alert based on calculated cerebral hemodynamic parameters as well as other data such as acceleration, temperature, humidity, and pressure data. Such a configuration enables proactive management of risks associated with cerebral hemodynamic changes. By generating alerts based on a comprehensive set of data parameters, including acceleration, temperature, humidity, and pressure data, the system can provide early and accurate warnings of conditions that may negatively affect cerebral hemodynamics. This allows for timely interventions to mitigate risks, improve user safety and well-being, and prevent complications that may arise due to extreme environmental conditions or physiological stressors.Furthermore, this multifaceted approach to monitoring allows for a more holistic understanding of the user's condition, leading to better decision-making and personalized care in medical and high-performance settings.

[0046] According to one embodiment, the sensor communication module is configured to transmit the alert to the control communication module and / or to an external device.

[0047] Such a configuration enables a versatile and comprehensive approach to managing and responding to alerts generated by the portable sensor control system. By allowing the sensor communication module to transmit alerts not only to the control communication module but also to an external device, the system ensures that alerts can be communicated to a wider range of recipients. The ability to transmit to an external device expands the potential for real-time intervention and response, as alerts can be received by healthcare professionals or caregivers who can take immediate action. Furthermore, this configuration allows the integration of the portable sensor control system into existing monitoring infrastructures, thereby improving the overall utility and efficiency of the system in various applications.

[0048] An external device, in the context of the portable sensor control system, can refer to a variety of devices or systems capable of receiving data from the sensor communication module. Examples of external devices include, but are not limited to, smartphones, tablets, computers, medical monitoring equipment, and dedicated portable receivers. These devices often have the ability to display, store, analyze, or transmit the data they receive.

[0049] For example, a smartphone could receive alerts from the portable sensor control system via a Bluetooth connection. The smartphone could then display These alerts can be sent to the user via a dedicated application, the data can be recorded for future reference, or the information can be sent to a healthcare professional for immediate attention. Similarly, a tablet or computer could be used by medical staff to monitor a patient's cerebral hemodynamic parameters in real time, allowing for a rapid response to any changes that might indicate a medical problem.

[0050] In a high-performance context, such as a pilot in an aircraft cockpit, the external device could be an avionics system that integrates sensor data with other flight information. This system could provide the pilot with a comprehensive overview of the aircraft's condition and their own condition, thereby improving situational awareness and flight safety.

[0051] In a research or clinical setting, the external device could be a medical monitoring system collecting and analyzing data from several patients simultaneously. This system could use advanced algorithms to detect patterns or abnormalities in cerebral hemodynamic parameters, aiding in the diagnosis or study of various medical conditions.

[0052] Furthermore, an external device could also be a remote server or a cloud platform where data is sent for storage, analysis, and access by authorized users from any location. This could facilitate long-term monitoring and trend analysis of an individual's health status, as well as enable telemedicine applications where healthcare professionals can remotely assess a patient's condition.

[0053] In summary, an external device in the portable sensor control system serves as a versatile endpoint for data generated by sensor devices, providing a bridge between the user and the wider digital ecosystem for health monitoring, data analysis and decision support.

[0054] According to one embodiment, each of the sensor devices comprises two red light emission modules and two infrared light emission modules.

[0055] The inclusion of two red light-emitting modules and two infrared light-emitting modules in each sensor device provides a technical effect that improves the redundancy, accuracy, and reliability of cerebral hemodynamic measurements. By having multiple light-emitting modules of each type, the system can continue to operate and provide accurate data even if one of the modules fails or becomes obstructed. This redundancy is particularly beneficial in dynamic environments where the sensor device may be subject to movement or partial occlusion. Furthermore, The use of multiple modules allows for a more uniform distribution of light over the measurement area, which can improve the quality of the data collected and reduce the impact of localized variations in tissue characteristics.

[0056] According to one embodiment, each of the sensor devices comprises five light sensors.

[0057] The inclusion of five light sensors in each sensor device improves the spatial resolution and accuracy of cerebral hemodynamic measurements. By using multiple light sensors, the system can capture a more detailed spatial map of the hemodynamic activity of brain tissue. This increased spatial resolution allows for more precise localization of changes in cerebral blood flow and oxygenation, which can be particularly valuable for assessing the distribution of cerebral hemodynamic responses in different brain regions. Furthermore, the use of five light sensors increases the system's redundancy, ensuring that even if one sensor fails or becomes obstructed, the remaining sensors can continue to provide reliable data, thus improving the system's robustness and reliability in dynamic and challenging environments.

[0058] According to one embodiment, at least one light sensor can be of any kind, such as a photodiode for example.

[0059] According to one embodiment, the emission control module is configured to calibrate the light emission modules.

[0060] Calibrating the light emission modules using the emission control module ensures that the intensity and / or wavelength of the emitted light are adjusted to optimize the measurement of cerebral hemodynamic parameters. This calibration process may involve adjusting the light intensity to account for individual user characteristics such as skin tone and tissue thickness, as well as environmental factors that may affect light transmission. By calibrating the light emission modules, the system can adapt to changes in users and maintain measurement accuracy over time and under varying conditions, thereby improving the reliability of the data collected for monitoring cerebral hemodynamics.Calibration also ensures that the optimal light intensity is sufficient for accurate measurements while preventing excessive heat generation, which can cause user discomfort. By carefully adjusting the light intensity during the calibration process, the system guarantees that the emitted light does not raise the temperature at the point of contact with the user's skin. This is particularly important for long-term monitoring, where prolonged heat exposure could affect user comfort. The user and potentially influence the measured hemodynamic parameters. The emission control module's ability to regulate light intensity thus contributes to user comfort and the overall safety of the monitoring process.

[0061] The emission control module, responsible for calibrating and controlling the light emission modules, adjusts the intensity and wavelength of the emitted light according to the calibration process. This process takes into account the individual characteristics of the user's head, such as skin tone and tissue thickness, as well as environmental factors that may influence light transmission. The calibrated light intensity is carefully controlled to ensure that the emitted light is of sufficient intensity to penetrate brain tissue and be detected by the light sensors, without causing discomfort or overheating at the point of contact with the user's skin.

[0062] The calibration process for the light-emitting modules begins with the emission control module setting the intensity of the light-emitting modules to a minimum level. An algorithm trained in different environments then evaluates the quality of the signal received by the light sensors to differentiate between poor-quality, noisy signals and those containing physiological information. If the signal is deemed valid, the calibration process continues; otherwise, the intensity of the light-emitting modules is incrementally increased to improve the signal quality. If the intensity reaches its maximum and / or if the temperature of an emission module reaches or exceeds 40°C without obtaining a valid signal, the user is alerted that the signal from the sensor device in question is of poor quality or that the sensor device is saturated.Once a valid signal is obtained, the emission control module begins data collection. This calibration process is not limited to intensity adjustments but also extends to other factors such as wavelength and emission duration, ensuring that the emitted light is optimized for accurate measurement of cerebral hemodynamic parameters while maintaining user comfort and safety.

[0063] During operation, the light-emitting modules emit light that passes through the skin of the head and brain tissue. The light is then partially absorbed by the blood in the brain tissue, with the unabsorbed light being reflected back to the surface. The light sensors detect this reflected light and generate measurement data indicative of the absorption characteristics of the brain tissue. This data is then used to calculate cerebral hemodynamic parameters, such as oxyhemoglobin and deoxyhemoglobin concentrations, which are indicative of the brain's oxygenation status.

[0064] The sensor device's ability to autonomously calculate these parameters and generate alerts based on the collected data demonstrates the sophisticated design and arrangement of the light-emitting modules and light sensors. This design ensures that the portable sensor control system can provide accurate, reliable, and comprehensive assessments of cerebral hemodynamics, facilitating real-time monitoring and timely interventions for the user's health and safety.

[0065] The sensor device of the portable sensor control system is meticulously designed to optimize the measurement of cerebral hemodynamic parameters. Each sensor device comprises two red light-emitting modules and two infrared light-emitting modules, strategically positioned to emit light at specific wavelengths that penetrate brain tissue. The red and infrared light-emitting modules are arranged close to each other to ensure that both wavelengths of light can be emitted simultaneously and uniformly over the measurement area.

[0066] Surrounding these light-emitting modules are five light sensors, configured to detect light reflected by brain tissue. The spatial arrangement of these light sensors is such that they are placed at various distances from the light-emitting modules, allowing the capture of reflected light through a range of tissue depths. This configuration enables the system to collect data reflecting the absorption characteristics of brain tissue at multiple points, improving the spatial resolution of the measurements.

[0067] The light sensors are positioned to form a pattern that maximizes coverage of the measurement area while minimizing signal loss or potential interference. Typically, one light sensor is placed at the center relative to the light-emitting modules, while the other four light sensors are distributed around this central point. The precise distances between the light sensors and the light-emitting modules ensure that the emitted light has an adequate path length through the tissues to provide meaningful data on cerebral blood flow and oxygenation.

[0068] According to one embodiment, at least one red light emission module is configured to emit light at a wavelength of 750+50 nm.

[0069] The selection of a wavelength of 750 ± 50 nm for at least one red light emission module is based on the absorption characteristics of deoxyhemoglobin, which absorbs more light in the red spectrum compared to oxyhemoglobin. By emitting light at this specific wavelength, the system can effectively differentiate between oxyhemoglobin and deoxyhemoglobin concentrations in brain tissue. This wavelength was chosen To optimize the measurement of cerebral hemodynamic parameters, particularly to assess changes in deoxyhemoglobin concentration, which is an indicator of oxygen depletion in brain tissue. The precise wavelength allows for targeted penetration of brain tissue and improves the accuracy of hemodynamic measurements obtained by light sensors.

[0070] According to one embodiment, at least one red light emission module is configured to emit light at a wavelength of approximately 750 nm.

[0071] As used herein, the term "approximately" refers to a value within a range of plus or minus 10 nm of a given wavelength. This range accounts for slight variations in wavelength that may occur due to manufacturing tolerances, environmental conditions, or other factors that could affect the precise emission of light. The term ensures that the light-emitting modules are considered to be operating at the desired wavelength even if there are slight deviations from the exact numerical value specified.

[0072] According to one embodiment, at least one infrared light-emitting module is configured to emit light at a wavelength of 850+50 nm.

[0073] The selection of a wavelength of 850 ± 50 nm for at least one infrared light-emitting module is based on the absorption characteristics of oxyhemoglobin, which absorbs more light in the infrared spectrum compared to deoxyhemoglobin. By emitting light at this specific wavelength, the system can effectively differentiate between oxyhemoglobin and deoxyhemoglobin concentrations in brain tissue. This wavelength was chosen to optimize the measurement of cerebral hemodynamic parameters, particularly for assessing changes in oxyhemoglobin concentration, which is an indicator of oxygenation in brain tissue. The precise wavelength allows for targeted penetration of brain tissue and improves the accuracy of hemodynamic measurements obtained by the light sensors.

[0074] According to one embodiment, at least one infrared light-emitting module is configured to emit light at a wavelength of approximately 850 nm.

[0075] According to one embodiment, the light-emitting modules are light-emitting diodes (LEDs).

[0076] According to a preferred embodiment, the light-emitting modules are high-power light-emitting diodes.

[0077] High-power light-emitting diodes are light-emitting diodes capable of emitting a higher luminous intensity compared to standard LEDs. These high-power LEDs are designed to operate at higher electrical power levels, which allows them to produce more light. Intense. This characteristic is particularly beneficial for medical and monitoring applications, such as portable sensor monitoring systems, where strong and precise light emission is required to penetrate tissues and facilitate accurate measurement of cerebral hemodynamic parameters. High-power LEDs also have a higher efficiency, or energy efficiency, allowing them to produce more light and less heat than other LEDs. High-power LEDs are typically equipped with advanced heat dissipation mechanisms to manage the increased heat generated by their higher operating power, ensuring LED longevity and user safety.The use of high-power LEDs in the sensor device allows for a more effective and efficient capture of light reflected by brain tissue, which is then used to calculate cerebral hemodynamic parameters indicative of the brain's oxygenation status.

[0078] According to one embodiment, at least one of the sensor devices comprises at least one isobestic light-emitting module. This isobestic light-emitting module is configured to emit light at a wavelength approximately equal to the isobestic wavelength of hemoglobin and deoxyhemoglobin. The inclusion of at least one isobestic light-emitting module operating at the isobestic point, where the absorption spectra of oxyhemoglobin and deoxyhemoglobin intersect, enables the measurement of the total hemoglobin concentration, providing a baseline reference for other measurements. This additional data point can be used to improve the accuracy of the hemodynamic parameters calculated by the emission control module, as it provides a stable reference insensitive to variations in oxygenation levels.The use of this third light-emitting module thus contributes to a more comprehensive assessment of cerebral blood volume and hemodynamic changes.

[0079] The invention also relates to a method for monitoring cerebral hemodynamic parameters of a user's head, said method being implemented by the portable sensor control system as described above, the method comprising: - the initiation of a measurement cycle by the emission control module, the measurement cycle comprising a sequence of light emissions from the red light emission module and the infrared light emission module; - the emission of light by the red light emission module and by the infrared light emission module, the emitted light penetrating the skin of the user's head and the brain tissues; - the detection, by the light sensor, of the light reflected by brain tissues and the generation of measurement data indicative of the absorption characteristics of brain tissues; - the calculation, by the emission control module, of cerebral hemodynamic parameters based on measurement data, the parameters including oxyhemoglobin and deoxyhemoglobin concentrations indicative of the brain's oxygenation state; - the generation of an alert based on calculated cerebral hemodynamic parameters when the parameters indicate a deviation from a predetermined range of cerebral oxygenation levels.

[0080] According to one embodiment, the predetermined range of cerebral oxygenation levels is dynamic over time. This feature allows adaptation to changes in the user's environment or situation. Indeed, for a user piloting an aircraft, the predetermined range of cerebral oxygenation levels will be more restrictive during cruise flight, when the user's cerebral oxygenation level is expected to remain relatively stable, than during landing, and even more so during a landing in zero visibility, for example.

[0081] According to one embodiment and taking into account the speed of propagation of light in the media considered, the detection, by the light sensor, of the light reflected by the brain tissues and the generation of measurement data indicative of the absorption characteristics of the brain tissues is carried out in parallel with the emission of light by the red light emission module and by the infrared light emission module, the emitted light penetrating the skin of the user's head and the brain tissues.

[0082] In one embodiment of the method for monitoring cerebral hemodynamic parameters, said method includes, prior to the initiation of the measurement cycle, calibration steps to ensure the accuracy and reliability of the measurements. The calibration steps begin with the emission control module initiating a pre-measurement calibration cycle, which comprises a series of steps designed to optimize the performance of the sensor device according to the current environmental conditions and the individual physiological characteristics of the user.

[0083] The calibration steps, also referred to as the light emission module calibration process, may include the following steps: - the emission control module regulates the intensity of the light emission modules to a minimum level; - An algorithm trained in different environments then evaluates the quality of the signal received by the light sensors to differentiate between poor-quality, noisy signals and those containing physiological information. If the signal is deemed valid, the calibration process continues; otherwise, the intensity of the light-emitting modules is incrementally increased to improve the signal quality. - if the intensity reaches its maximum and / or if the temperature of an emission module reaches a temperature equal to or greater than 40°C without obtaining a valid signal, the user is alerted that the signal from the sensor device in question is of poor quality or that said sensor device is in saturation; - Once a valid signal is obtained, the emission control module begins data collection. This calibration process is not limited to intensity adjustments but also extends to other factors such as emission duration, ensuring that the emitted light is optimized for accurate measurement of cerebral hemodynamic parameters while maintaining user comfort and safety.

[0084] The embodiments, technical effects, and definitions disclosed herein with respect to the portable sensor control system also apply to the method described herein. The method includes steps that fully exploit the functionalities and features of the portable sensor control system described herein. Therefore, all embodiments, technical effects, and definitions concerning the device also apply to the method. This ensures a complete and unified understanding of the aspects of the portable sensor control system and the method of the invention, facilitating the implementation and use of the disclosed technology in a range of applications.

[0085] The invention also relates to a computer program product comprising instructions to cause the portable sensor control system described above to perform the steps of the process described above.

[0086] The various non-incompatible aspects defined above can be combined. Brief description of the drawings

[0087] The invention will be better understood and other features and advantages thereof will become apparent from the following description of particular embodiments of the invention, given by way of illustrative and non-limiting examples, and with reference to the accompanying drawings, among which:

[0088] [Fig-1] represents a schematic view of a portable sensor control system according to the invention;

[0089] [Fig.2] represents a schematic view of a sensor device according to the invention;

[0090] [Fig.3] represents a calibration of a sensor device according to the invention; and

[0091] [Fig.4] represents a monitoring method according to the invention. Description of the implementation methods

[0092] Figure 1 represents a portable sensor control system 10 for monitoring the cerebral hemodynamic parameters of a user's head. The system 10 comprises two identical sensor devices and a control device 40.

[0093] As shown in [Fig. 2], each sensor device 20 comprises two red light-emitting modules 21, namely high-power light-emitting diodes (LEDs). These red light-emitting modules 21 are configured to be positioned on the user's head and emit light through the skin of the user's head. Each sensor device 20 also comprises two infrared light-emitting modules 22. These infrared light-emitting modules 22 are configured to be positioned on the user's head and emit light through the skin of the user's head. The inclusion of two red light-emitting modules 21 and two infrared light-emitting modules 22 in each sensor device 20 provides a technical effect that improves the redundancy, accuracy, and reliability of cerebral hemodynamic measurements.By having multiple light-emitting modules 21, 22 of each type, the system 10 can continue to function and provide accurate data even if one of the modules fails or becomes obstructed. This redundancy is particularly beneficial in dynamic environments where the sensor device 20 may be subject to movement or partial occlusion. Furthermore, the use of multiple modules allows for a more uniform distribution of light over the measurement area, which can improve the quality of the collected data and reduce the impact of localized variations in tissue characteristics.

[0094] The red light emission modules 21 are configured to emit light at a wavelength of 750 + 50 nm, and preferably around 750 nm. The selection of a wavelength of 750 + 50 nm for the red light emission modules 21 is based on the absorption characteristics of deoxyhemoglobin, which absorbs more light in the red spectrum compared to oxyhemoglobin. By emitting light at this specific wavelength, the system 10 can effectively differentiate between oxyhemoglobin and deoxyhemoglobin concentrations in brain tissue. This wavelength was chosen to optimize the measurement of cerebral hemodynamic parameters, in particular to assess changes in deoxyhemoglobin concentration, which is an indicator of oxygen depletion in brain tissue. The wavelength precise allows targeted penetration of brain tissues and improves the accuracy of hemodynamic measurements obtained by light sensors 23.

[0095] The infrared light-emitting modules 22 are configured to emit light at a wavelength of 850 + 50 nm, and preferably around 850 nm. The selection of a wavelength of 850 + 50 nm for the infrared light-emitting modules 22 is based on the absorption characteristics of oxyhemoglobin, which absorbs more light in the infrared spectrum compared to deoxyhemoglobin. By emitting light at this specific wavelength, the system 10 can effectively differentiate between oxyhemoglobin and deoxyhemoglobin concentrations in brain tissue. This wavelength was chosen to optimize the measurement of cerebral hemodynamic parameters, in particular to assess changes in oxyhemoglobin concentration, which is an indicator of oxygenation in brain tissue.The precise wavelength allows targeted penetration of brain tissue and improves the accuracy of hemodynamic measurements obtained by light sensors 23.

[0096] According to an embodiment not shown, at least one of the sensor devices comprises at least one isobestic light emission module. This isobestic light emission module is configured to emit light at a wavelength approximately equal to the isobestic wavelength of hemoglobin and deoxyhemoglobin. The inclusion of at least one isobestic light emission module operating at the isobestic point, where the absorption spectra of oxyhemoglobin and deoxyhemoglobin intersect, enables the measurement of the total hemoglobin concentration, providing a baseline reference for other measurements. This additional data point can be used to improve the accuracy of the hemodynamic parameters calculated by the emission control module 24, as it provides a stable reference insensitive to variations in oxygenation levels.The use of this third light-emitting module thus contributes to a more comprehensive assessment of cerebral blood volume and hemodynamic changes.

[0097] According to an embodiment not shown, each light-emitting module includes an optical lens. The use of an optical lens makes it possible to concentrate the light emitted by the light-emitting modules 21, 22 and thus increase the accuracy of the system 10, reduce the energy consumption of the system 10 as well as the amount of heat emitted.

[0098] Each sensor device 20 comprises five light sensors 23, namely photodiodes. Said light sensors 23 are configured to detect the light emitted by the light-emitting modules 21, 22 and generate measurement data. The portable sensor control system 10 is designed to monitor the Cerebral hemodynamic parameters are measured using two sensor devices. The light-emitting modules 21 and 22 emit light at predetermined wavelengths that penetrate the skin and brain tissue. The light emitted by the red light-emitting modules 21 and infrared light-emitting modules 22 is partially absorbed by the blood in the brain tissue, and the unabsorbed light is reflected back to the surface where it is detected by the light sensors 23. Variations in light absorption indicate changes in hemoglobin concentration in the brain tissue. Specifically, the system 10 is capable of distinguishing between oxyhemoglobin and deoxyhemoglobin, which are markers of oxygenated and deoxygenated blood, respectively. By analyzing the differential absorption of light at the two wavelengths, the device can infer the relative concentrations of these hemoglobin species.The measurement data generated by the sensor device 20 is transmitted to the remote control device 40. The emission control module 24 is responsible for interpreting the signals from the sensors to determine the user's health status and cognitive workload. This information can then be used to provide real-time feedback to the user, potentially alerting them to changes in cerebral hemodynamics that may require attention. Thus, the inclusion of red light emission modules 21 and infrared light emission modules 22 in the portable sensor control system 10 improves the accuracy of hemodynamic measurements by exploiting the distinct absorption characteristics of oxyhemoglobin and deoxyhemoglobin at different wavelengths of light.Oxyhemoglobin, which carries oxygen, has a higher absorption rate at infrared wavelengths, while deoxyhemoglobin, which is oxygen-depleted, absorbs more red light. By emitting light at both red and infrared wavelengths, System 10 can simultaneously measure the absorption of each hemoglobin state. This dual-wavelength approach allows for the calculation of the relative concentrations of oxyhemoglobin and deoxyhemoglobin in brain tissue, providing a more comprehensive and accurate assessment of cerebral hemodynamics. The ability to differentiate between these two hemoglobin states is particularly valuable for determining the brain's oxygenation status, which is a direct indicator of brain health and function. Accurate measurement of these parameters is instrumental in monitoring cognitive workload and health status, thereby increasing the reliability of the data collected by System 10.The inclusion of five light sensors 23 in each sensor device 20 improves the spatial resolution and accuracy of cerebral hemodynamic measurements. By using multiple light sensors 23, the system 10 can capture a more detailed spatial map of the hemodynamic activity of brain tissue. This spatial resolution... This increased capability allows for more precise localization of changes in cerebral blood flow and oxygenation, which can be particularly valuable for assessing the distribution of cerebral hemodynamic responses in different brain regions. Furthermore, the use of five light sensors increases the system's redundancy, ensuring that even if one sensor fails or becomes obstructed, the remaining sensors can continue to provide reliable data, thus improving the system's robustness and reliability in dynamic and challenging environments.

[0099] Each sensor device 20 includes an emission control module 24. This emission control module 24 is configured to control the light emission modules 21, 22 and to receive measurement data from the light sensors 23. In the context of the portable sensor control system 10, the emission control module 24 is a multimodal interface. This interface is configured to manage the operation of the red light emission modules 21 and infrared light emission modules 22, including the initiation and cessation of light emission, the wavelength of the emitted light, and the adjustment of the light intensity. Furthermore, the emission control module 24 is responsible for receiving measurement data from at least one light sensor 23, which detects the light emitted by the red light emission modules 21 and infrared light emission modules 22.The multimodal capabilities of the 24 emission control module allow it to process and integrate data from multiple sources, facilitating complete control of the light emission process and ensuring accurate data acquisition for monitoring cerebral hemodynamic parameters.

[0100] Each sensor device 20 includes a power supply module 25. Said power supply module 25 is configured to receive power from a power source and to supply power to the various sensors and modules of the sensor device 20.

[0101] Each device also includes a sensor communication module 26. Said sensor communication module 26 is configured to exchange data with the emission control module 24 and a control communication module 46.

[0102] Each sensor device 20 includes an acceleration sensor 27. The acceleration sensor 27 is configured to measure acceleration and generate acceleration data that also includes gyroscopic data. The transmission control module 24 is configured to receive the acceleration data. Including an acceleration sensor 27 in the portable sensor control system 10 enhances the system 10's ability to monitor and analyze the user's physical movements and the associated physiological effects of those movements. The acceleration sensor 27 is configured to measure the acceleration forces acting on the user's head, which can range from subtle movements to rapid changes in direction or speed. By generating acceleration data, the system 10 can correlate these forces with cerebral hemodynamic parameters. Static accelerations include gravity, allowing the sensor to determine the user's head orientation, while dynamic accelerations are related to movement and can indicate the onset of rapid maneuvers or impacts. The emission control module 24, which already manages the operation of the red light 21 and infrared 22 emission modules, is further configured to receive this acceleration data.This integration allows System 10 to account for motion artifacts in cerebral hemodynamic measurements, which can be particularly useful when monitoring pilots or individuals in high-motion environments. Furthermore, acceleration data can provide valuable context for interpreting changes in cerebral blood flow and oxygenation. For example, an increase in cerebral blood volume may be associated with physical exertion, which can be confirmed by corresponding acceleration data. This additional data layer enhances System 10's ability to provide a comprehensive assessment of the user's physiological state, including the potential effects of physical activity or external forces on cerebral hemodynamics.In summary, the inclusion of a 27-inch accelerometer in the 10-inch portable sensor control system provides a technical effect that improves the accuracy and reliability of monitored cerebral hemodynamic parameters by taking into account the user's head movements and associated physiological responses. This allows for a more nuanced understanding of the user's health status and cognitive workload, particularly in dynamic or physically demanding environments.

[0103] Similarly, each sensor device 20 includes a temperature sensor 28. This temperature sensor 28 is configured to measure temperature and generate temperature data. The transmission control module 24 is configured to receive the temperature data. Including a temperature sensor 28 in the portable sensor control system 10 enhances the system 10's ability to monitor and analyze the user's head temperature and the physiological effects associated with temperature changes. The temperature sensor 28 is configured to measure the temperature at the location where the sensor device 20 is positioned on the user's head, which may vary due to environmental conditions, physical activity, or changes in cerebral blood flow. By generating temperature data, the system 10 can correlate these temperature changes with cerebral hemodynamic parameters.. The ability to measure temperature provides valuable context for interpreting changes in cerebral hemodynamics. For example, an increase in head temperature may indicate increased cerebral blood flow or metabolic activity, which could be associated with cognitive exertion or stress. Conversely, a decrease in temperature may suggest reduced cerebral perfusion or exposure to a cold environment. The emission control module 24, which manages the operation of the red light emission modules 21 and infrared emission modules 22, is further configured to receive this temperature data. This integration allows System 10 to account for the thermal effects on cerebral hemodynamic measurements, which can be particularly useful when monitoring individuals in varying environmental conditions or during physical exertion. Furthermore, temperature data can be used to ensure user thermal comfort by monitoring for potential overheating conditions that may arise from prolonged use of the sensor device 20 or exposure to elevated ambient temperatures. This additional data layer enhances System 10's ability to provide a comprehensive assessment of the user's physiological state, including the potential effects of environmental temperature or body heat on cerebral hemodynamics.In summary, the inclusion of a temperature sensor 28 in the portable sensor control system 10 provides a technical effect that improves the accuracy and reliability of monitored cerebral hemodynamic parameters by taking into account the thermal state of the user's head. This allows for a more comprehensive understanding of the user's health status and cognitive workload, particularly in environments where temperature conditions vary or during activities that can affect body temperature.

[0104] Each sensor device 20 includes a humidity sensor 29. This humidity sensor 29 is configured to measure humidity levels and generate humidity data. The emission control module 24 is configured to receive the humidity data. Including a humidity sensor 29 in the portable sensor control system 10 enhances the system 10's ability to monitor and analyze humidity levels around the user's head and the physiological effects associated with changes in humidity. The humidity sensor 29 is configured to measure humidity levels at the location where the sensor device 20 is positioned on the user's head, which may vary due to environmental conditions, physical activity, or changes in perspiration rates. By generating humidity data, the system 10 can correlate these humidity changes with cerebral hemodynamic parameters.The ability to measure humidity provides valuable context for interpreting changes in cerebral hemodynamics. For example, increased humidity levels around the head may indicate increased perspiration, which could be associated with physical exertion or stress responses. Conversely, decreased humidity levels may suggest a drier environment or reduced perspiration. The emission control module 24, which manages the operation of the red light emission modules 21 and infrared emission modules 22, is further configured to receive this humidity data. This integration allows System 10 to account for the effects of humidity on cerebral hemodynamic measurements, which can be particularly useful when monitoring individuals in varying environmental conditions or during activities that induce sweating. Furthermore, humidity data can be used to ensure user comfort by monitoring for conditions that could lead to dehydration or heat stress. This additional data layer enhances System 10's ability to provide a comprehensive assessment of the user's physiological state, including the potential effects of environmental humidity or perspiration on cerebral hemodynamics.In summary, the inclusion of a humidity sensor 29 in the portable sensor control system 10 provides a technical effect that improves the accuracy and reliability of monitored cerebral hemodynamic parameters by taking into account the humidity levels around the user's head. This allows for a more comprehensive understanding of the user's health status and cognitive workload, particularly in environments where humidity conditions vary or during activities that can influence perspiration and hydration levels.

[0105] Each sensor device 20 includes a pressure sensor 30. Said pressure sensor 30 is configured to measure pressure and generate pressure data. The emission control module 24 is configured to receive the pressure data. Including a pressure sensor 30 in the portable sensor control system 10 enhances the system's ability to monitor and analyze pressure conditions in the user's environment and the physiological effects associated with pressure changes. The pressure sensor 30 is configured to measure the pressure at the location where the sensor device 20 is positioned on the user's body, which may vary due to environmental conditions such as changes in altitude, cabin pressurization, or rapid maneuvers in an aircraft cockpit.By generating pressure data, System 10 can correlate these pressure changes with cerebral hemodynamic parameters. The ability to measure pressure provides valuable context for interpreting changes in cerebral hemodynamics. For example, a sudden drop in ambient pressure may indicate a rapid ascent or decompression event, which could lead to hypoxia or other responses. Physiological effects related to altitude. Conversely, an increase in pressure can be associated with descent or with the pressurization of the aircraft cabin. The emission control module 24, which manages the operation of the red light emission modules 21 and infrared 22, is further configured to receive this pressure data. This integration allows the system 10 to take into account the effects of pressure on cerebral hemodynamic measurements, which can be particularly useful when monitoring pilots or individuals in environments where pressure conditions are subject to change. In addition, pressure data can be used to ensure user safety and well-being by monitoring for potentially hazardous conditions that may arise due to sudden pressure changes or prolonged exposure to suboptimal pressure levels.This additional data layer enhances the system's ability to provide a comprehensive assessment of the user's physiological state, including the potential effects of environmental pressure changes on cerebral hemodynamics. In summary, the inclusion of a pressure sensor in the portable sensor control system provides a technical benefit that improves the accuracy and reliability of monitored cerebral hemodynamic parameters by taking into account the pressure conditions experienced by the user. This allows for a more complete understanding of the user's health status and cognitive workload, particularly in environments where pressure conditions can change rapidly, such as during flight operations.

[0106] The control device 40 includes the control communication module 46 with which the sensor communication module 26 communicates. Said control communication module 46 is therefore configured to exchange data with the sensor communication module 26.

[0107] The control device 40 further includes a data storage unit, also called storage, configured to store data received from the sensor communication module 26. This data storage is designed to retain measurement data transmitted by the sensor communication module 26, including, but not limited to, cerebral hemodynamic parameters, acceleration data, temperature data, humidity data, and pressure data. The data storage allows for the archiving of historical data, enabling long-term analysis and monitoring of trends in the user's physiological state. Furthermore, the data storage capacity facilitates data retrieval for post-processing, detailed analysis, or subsequent review.The inclusion of data storage within the control device 40 ensures that valuable physiological data is not lost and can be accessed as needed by the user or healthcare professionals.

[0108] According to one embodiment, the control device 40 includes a power supply, said power supply being configured to send power to the power supply module 25 of each sensor device 20. Such an arrangement makes it possible to share the power supply and thus facilitates user comfort by reducing the size or weight of the sensing device on the user's head, while minimizing potential thermal effects.

[0109] According to a preferred embodiment, each sensor device 20 includes a power supply, said power supply being configured to send energy to the power supply module 25. Such an arrangement allows each sensor device 20 to be energy self-sufficient, which allows greater freedom of positioning on the user's head, thus adapting more easily to the particularities of said user.

[0110] The control device 40 is separated from the sensor devices, and the sensor devices 20 are separated from each other. In this document, the term "separated" refers to a physical separation, such as a physical separation between the control device 40 and at least one sensor device 20, for example. This separation is intended to allow the control device 40 to be placed in a different location on the user's body or in their environment, rather than being integrated into or attached directly to the sensing device itself. The separated configuration allows the control device 40 to perform its functions without being subject to the same environmental or motion conditions as the sensing device, which can improve the accuracy and reliability of data processing and energy management.This separation also improves user comfort by reducing the bulk or weight of the sensing device on the user's head, as well as minimizing potential thermal effects from the operation of the control device 40 at the detector site. The technical effect of locating the control device 40 away from the sensor device 20 is to enhance the flexibility and adaptability of the portable sensor control system 10. This configuration can, for example, allow the separation of processing and control functions from data acquisition functions, which can lead to improved signal processing capabilities and more efficient power management. By locating the control device 40, the system 10 can minimize interference and noise that might be introduced by the proximity of the control electronics to the sensitive sensor elements.Furthermore, this separation can facilitate the placement of the sensor device 20 in an optimal position on the user's head for data collection, while allowing the control device 40 to be placed elsewhere on the user's body where it is less bothersome, thus improving user comfort and compliance with long-term monitoring. The remote configuration of the control device 40 relative to the sensor device 20 also provides a technical benefit related to heat dissipation management. By physically separating the control device 40, which can generate heat during operation, from one or more sensor devices positioned on the user's head, the system 10 can reduce the thermal load applied to the head area. This is particularly beneficial because the light-emitting modules 21, 22 themselves also emit heat in addition to light. Minimizing the user's head's heat exposure not only improves comfort but also prevents any potential thermal interference with cerebral hemodynamic measurements, ensuring more accurate and reliable data collection.

[0111] In addition to monitoring cerebral hemodynamic parameters, the portable sensor control system 10 is configured to measure heart rate using the light sensors 23 to detect pulsating changes in blood volume in brain tissue. As the heart beats, it induces rhythmic fluctuations in blood volume and consequently in the light absorption characteristics of brain tissue. These pulsating changes are captured by the light sensors 23 as variations in the intensity of light reflected from the skin of the head and from the brain tissue. The emission control module 24, which manages the operation of the red light 21 and infrared light 22 emission modules, is also configured to process the temporal pattern of the received light signals corresponding to the cardiac cycle.By analyzing time-series data on light absorption, the system 10 can extract the periodicity and regularity of blood volume changes, which are indicative of heart rhythm. The sensor communication module 26 is configured to transmit heart rhythm measurement data to the emission control module 24, which processes this data to determine the user's heart rhythm. The system 10 can use algorithms to filter noise and improve cardiac signal detection, ensuring accurate and reliable heart rhythm measurement. This heart rhythm data can be used to provide additional information about the user's physiological state and can be integrated with cerebral hemodynamic measurements to offer a more comprehensive assessment of the user's health status.

[0112] The relationship between blood volume in the head and heart rate is a dynamic physiological interaction where heart rate adjusts to maintain cerebral perfusion and overall circulatory homeostasis. When blood volume in the head is too high, potentially due to gravitational effects or postural changes, the body's baroreceptors—sensitive to changes in blood pressure—signal the heart to reduce its rate. This decrease in Heart rate slows, or bradycardia allows blood to return to the body, thus reducing pressure and volume in the cerebral vessels. Conversely, when blood volume in the head is low, which can occur during rapid acceleration or deceleration, the heart rate increases to pump blood more efficiently to the head. This compensatory mechanism, known as tachycardia, ensures that the brain receives sufficient oxygen and nutrients by increasing blood flow to compensate for the reduced cerebral blood volume. The ability of the portable sensor control system to measure heart rate by detecting pulsatile changes in blood volume in brain tissue is therefore essential for monitoring the user's physiological state and maintaining cerebral hemodynamic stability.

[0113] Thus, the emission control module 24 is configured to calculate, among other things, the user's head cerebral hemodynamic parameters based on received data. As used here, the term "received data" refers to data acquired by the emission control module 24 from various sources, including, for example, but not limited to, measurement data generated by the light sensor 23, acceleration data, temperature data, humidity data, and pressure data. The received data may include measurement data indicating the light absorbed and reflected by brain tissue, as well as any additional data such as acceleration data from the acceleration sensor 27. This data is processed and analyzed to calculate cerebral hemodynamic parameters and other physiological measurements relevant to the user's health status and cognitive workload.This configuration allows each sensor device 20 to autonomously calculate cerebral hemodynamic parameters, thereby decentralizing data processing and reducing the computational load on the control device 40. This autonomy improves the efficiency of the system 10 by enabling real-time processing at the data capture point, which is particularly advantageous in dynamic environments where rapid changes in cerebral hemodynamics can occur. By equipping each sensor device 20 with the ability to calculate these parameters, the system 10 can provide immediate feedback to the user and facilitate timely interventions. Furthermore, this configuration allows parallel processing between multiple sensor devices, potentially increasing the overall data throughput of the system 10 and providing a richer hemodynamic dataset for comprehensive analysis.Such a configuration also allows the portable sensor control system 10 to create redundancy. The inclusion of redundancy in the design of the portable sensor control system 10 provides a technical effect that improves the... reliability and robustness of system 10. By incorporating several autonomous sensor devices, system 10 can continue to operate effectively even if one sensor device 20 fails.

[0114] The emission control module 24 is also configured to generate an alert based on at least the calculated cerebral hemodynamic parameters. More specifically, the emission control module 24 is configured to generate an alert based on the calculated cerebral hemodynamic parameters as well as other data such as acceleration, temperature, humidity, and pressure data. Such a configuration allows for proactive management of risks associated with cerebral hemodynamic changes. By generating alerts based on a comprehensive set of data parameters, including acceleration, temperature, humidity, and pressure data, the system 10 can provide early and accurate warnings of conditions that may negatively affect cerebral hemodynamics.This allows for timely interventions to mitigate risks, improve user safety and well-being, and prevent complications that may arise due to extreme environmental conditions or physiological stressors. Furthermore, this multifaceted approach to monitoring enables a more holistic understanding of the user's condition, leading to better decision-making and personalized care in medical and high-performance settings.

[0115] The sensor communication module 26 is configured to transmit the alert to the control communication module 46 and / or to an external device. Such a configuration allows for a versatile and comprehensive approach to managing and responding to alerts generated by the portable sensor control system 10. By enabling the sensor communication module 26 to transmit alerts not only to the control communication module 46 but also to an external device, the system 10 ensures that alerts can be communicated to a wider range of recipients. The ability to transmit to an external device expands the potential for real-time intervention and response, as alerts can be received by healthcare professionals or caregivers who can take immediate action.Furthermore, this configuration allows the integration of the portable sensor control system into existing monitoring infrastructures, thereby improving the overall utility and efficiency of the system in various applications. An external device, in the context of the portable sensor control system, can refer to a variety of devices or systems capable of receiving data from the sensor communication module. Examples of external devices include, but are not limited to, smartphones, tablets, computers, medical monitoring equipment, and wearable receivers. Dedicated devices often have the ability to display, store, analyze, or transmit the data they receive. For example, a smartphone could receive alerts from the wearable sensor monitoring system via a Bluetooth connection. The smartphone could then display these alerts to the user through a dedicated app, save the data for future reference, or send the information to a healthcare professional for immediate attention. Similarly, a tablet or computer could be used by medical personnel to monitor a patient's cerebral hemodynamic parameters in real time, allowing for a rapid response to any changes that might indicate a medical problem. In a high-performance context, such as a pilot in an aircraft cockpit, the external device could be an avionics system that integrates sensor data with other flight information.This system could provide the pilot with a comprehensive overview of the aircraft's condition and their own, thereby improving situational awareness and flight safety. In a research or clinical setting, the external device could be a medical monitoring system collecting and analyzing data from multiple patients simultaneously. This system could use advanced algorithms to detect patterns or anomalies in cerebral hemodynamic parameters, aiding in the diagnosis or investigation of various medical conditions. Furthermore, an external device could also be a remote server or cloud platform where data is sent for storage, analysis, and access by authorized users from any location.This could facilitate long-term monitoring and trend analysis of an individual's health status, as well as enable telemedicine applications where healthcare professionals can remotely assess a patient's condition. In summary, an external device within the portable sensor control system serves as a versatile endpoint for data generated by sensor devices, providing a bridge between the user and the broader digital ecosystem for health monitoring, data analysis, and decision support.

[0116] In addition to the processing performed at the level of each sensor device 20, the portable sensor control system 10 can also benefit from a global analysis of the entire brain. This global analysis can be performed by an external device, for example in the cockpit of an aircraft, which receives pre-processed data and alerts from each sensor device 20 via sensor communication modules 26. This external device can thus have a complete view of the user's cerebral hemodynamic state. By combining the information from several sensor devices 20 positioned at different locations on the head, as illustrated in [Fig. 1], the external device can perform more sophisticated analyses, such as mapping brain activity and detecting circulatory patterns. abnormal blood levels, or the identification of specific brain areas showing significant changes. This comprehensive approach can provide more nuanced information about the user's cognitive and physiological state, enabling more accurate risk assessment and more informed decision-making. In the context of an airline pilot, for example, this holistic view could help detect early signs of fatigue, stress, or hypoxia, thus contributing to improved flight safety. Furthermore, by integrating this comprehensive data with other monitoring systems, System 10 can offer a more complete understanding of the user's condition within their operational environment.

[0117] The emission control module 24 is configured to calibrate the light emission modules 21, 22 as shown in [Fig. 3]. Calibration of the light emission modules 21, 22 by the emission control module 24 ensures that the intensity and / or wavelength of the emitted light are adjusted to optimize the measurement of cerebral hemodynamic parameters. This calibration process may involve adjusting the light intensity to take into account individual user characteristics such as skin tone and tissue thickness, as well as environmental factors that may affect light transmission.By calibrating the light emission modules 21 and 22, the system 10 can adapt to changes in users and maintain measurement accuracy over time and under varying conditions, thus improving the reliability of the data collected for monitoring cerebral hemodynamics. Calibration also ensures that an optimal light intensity is maintained for accurate measurements while avoiding excessive heat generation, which could cause user discomfort. By carefully adjusting the light intensity during the calibration process, the system 10 guarantees that the emitted light does not raise the temperature at the point of contact with the user's skin. This is particularly important for long-term monitoring, where prolonged heat exposure could affect user comfort and potentially influence the measured hemodynamic parameters.The ability of the emission control module 24 to regulate light intensity thus contributes to user comfort and the overall safety of the monitoring process. Responsible for calibrating and controlling the light emission modules 21 and 22, the emission control module 24 adjusts the intensity and wavelength of the emitted light according to the calibration process. This process takes into account the individual characteristics of the user's head, such as skin tone and tissue thickness, as well as environmental factors that can influence light transmission. The calibrated light intensity is carefully controlled to ensure that the emitted light is of sufficient intensity to penetrate the tissues. brain activity and be detected by the light sensors 23, without causing discomfort or overheating at the point of contact with the user's skin. The calibration process of the light-emitting modules 21, 22 begins with the emission control module 24 setting the intensity of the light-emitting modules 21, 22 to a minimum level. An algorithm trained in different environments then evaluates the quality of the signal received by the light sensors 23 to differentiate between poor-quality, noisy signals and those containing physiological information. If the signal is deemed valid, the calibration process continues; otherwise, the intensity of the light-emitting modules 21, 22 is incrementally increased to improve the signal quality.If the intensity reaches its maximum and / or the temperature of an emitting module reaches or exceeds 40°C without obtaining a valid signal, the user is alerted that the signal from the sensor device 20 is of poor quality or that the sensor device 20 is saturated. Once a valid signal is obtained, the emission control module 24 begins data collection. This calibration process is not limited to intensity adjustments but also extends to other factors such as wavelength and emission duration, ensuring that the emitted light is optimized for accurate measurement of cerebral hemodynamic parameters while maintaining user comfort and safety. During operation, the light emission modules 21 and 22 emit light that passes through the skin of the head and brain tissue.Light is then partially absorbed by the blood in brain tissue, with the unabsorbed light being reflected back to the surface. The light sensors 23 detect this reflected light and generate measurement data indicative of the absorption characteristics of brain tissue. This data is then used to calculate cerebral hemodynamic parameters, such as oxyhemoglobin and deoxyhemoglobin concentrations, which are indicative of the brain's oxygenation status. The ability of the sensor device 20 to autonomously calculate these parameters and generate alerts based on the collected data demonstrates the sophisticated design and arrangement of the light-emitting modules 21, 22, and the light sensors 23.This design ensures that the portable sensor monitoring system can provide accurate, reliable, and comprehensive assessments of cerebral hemodynamics, facilitating real-time monitoring and timely interventions for the user's health and safety. The sensor device of the portable sensor monitoring system is meticulously designed to optimize the measurement of cerebral hemodynamic parameters. Each sensor device comprises two red light emission modules and two infrared light emission modules, strategically positioned to emit light at specific wavelengths that penetrate brain tissue. The emission modules... Red light 21 and infrared light 22 are positioned close to each other to ensure that both wavelengths of light can be emitted simultaneously and uniformly over the measurement area. Around these light-emitting modules 21 and 22 are five light sensors 23, configured to detect light reflected from brain tissue. The spatial arrangement of these light sensors 23 is such that they are placed at varying distances from the light-emitting modules 21 and 22, allowing the capture of reflected light across a range of tissue depths. This configuration enables the system 10 to collect data reflecting the absorption characteristics of brain tissue at multiple points, improving the spatial resolution of the measurements. The light sensors 23 are positioned to form a pattern that maximizes coverage of the measurement area while minimizing signal loss or potential interference.Typically, a light sensor 23 is positioned at the center relative to the light-emitting modules 21, 22, while the four other light sensors 23 are distributed around this central point. The precise distances between the light sensors 23 and the light-emitting modules 21, 22 ensure that the emitted light has an adequate path length through the tissues to provide meaningful data on cerebral blood flow and oxygenation.

[0118] As shown in [Fig. 4], the invention also relates to a method for monitoring the cerebral hemodynamic parameters of a user's head, said method being implemented by the portable sensor control system 10 as described above, the method comprising: - the initiation of a measurement cycle 60 by the emission control module 24, the measurement cycle comprising a sequence of light emissions from the red light emission module 21 and the red light emission module 22; - the emission of light 70 by the red light emission module 21 and by the red light emission module 22, the emitted light penetrating the skin of the user's head and the brain tissues; - the detection 80, by the light sensor 23, of the light reflected by brain tissues and the generation of measurement data indicative of the absorption characteristics of brain tissues; - the calculation 90, by the emission control module 24, of cerebral hemodynamic parameters on the basis of measurement data, the parameters including the concentrations of oxyhemoglobin and deoxyhemoglobin indicative of the oxygenation state of the brain; - the generation of an alert 100 based on calculated cerebral hemodynamic parameters when the parameters indicate a deviation from a predetermined range of cerebral oxygenation levels.

[0119] The predetermined range of cerebral oxygenation levels is dynamic over time. This characteristic allows adaptation to changes in the environment or the user's situation. Indeed, in the case of a user piloting an aircraft, the predetermined range of cerebral oxygenation levels will be more restrictive during cruise flight, when the user's cerebral oxygenation level is expected to remain relatively stable, than during landing, and even more so during a landing in zero visibility, for example.

[0120] Given the speed of propagation of light in the media considered, the detection, by the light sensor 23, of the light reflected by the brain tissues and the generation of measurement data indicative of the absorption characteristics of the brain tissues is carried out in parallel with the emission of light by the red light emission module 21 and by the red light emission module 22, the emitted light penetrating the skin of the user's head and the brain tissues.

[0121] The method includes, prior to the initiation of the measurement cycle, calibration steps 50 to ensure the accuracy and reliability of the measurements. The calibration steps begin with the emission control module 24 initiating a pre-measurement calibration cycle, which includes a series of steps designed to optimize the performance of the sensor device 20 according to the current environmental conditions and the individual physiological characteristics of the user.

[0122] The calibration steps, also referred to as the calibration process of the light-emitting modules 21, 22, may include the following steps: - the emission control module 24 regulates the intensity 51 of the light emission modules 21, 22 to a minimum level; - An algorithm trained in different environments then evaluates the quality of the signal 52 received by the light sensors 23 to differentiate between poor-quality, noisy signals and those containing physiological information. If the signal is deemed valid, the calibration process continues; otherwise, the intensity of the light-emitting modules 21, 22 is incrementally increased to improve the signal quality; - if the intensity reaches its maximum and / or if the temperature of an emission module reaches a temperature equal to or greater than 40°C without obtaining a valid signal, the user is alerted 53 that the signal from the sensor device 20 in question is of poor quality or that said sensor device 20 is in saturation; - otherwise, the emission control module 24 increases the intensity 54 of the light emission modules 21, 22 and step 52 is repeated; - once a valid signal is obtained, the emission control module 24 begins data collection.

[0123] This calibration process is not limited to intensity adjustments but also extends to other factors such as wavelength and emission duration, ensuring that the emitted light is optimized for accurate measurement of cerebral hemodynamic parameters while maintaining user comfort and safety.

[0124] The embodiments, technical effects, and definitions disclosed herein with respect to the portable sensor control system also apply to the method described herein. The method includes steps that fully exploit the functionalities and features of the portable sensor control system described herein. Therefore, all embodiments, technical effects, and definitions concerning the device also apply to the method. This ensures a complete and unified understanding of the aspects of the portable sensor control system and the method of the invention, facilitating the implementation and use of the disclosed technology in a range of applications.

[0125] The invention also relates to a computer program product comprising instructions to cause the portable sensor control system 10 as described to perform the steps of the process also described.

[0126] The present portable sensor control system 10 is suitable for industrial applications in various sectors. System 10 is particularly relevant in the field of aviation, where it can be used to monitor the physiological and cognitive state of pilots during flight operations. System 10's ability to measure cerebral hemodynamic parameters, such as oxyhemoglobin and deoxyhemoglobin concentrations, provides valuable information on the pilot's cerebral oxygenation levels, which can indicate cognitive load, fatigue, and overall health. This information can be used to improve flight safety by alerting pilots or ground personnel to health risks or performance issues.

[0127] In addition to aviation, the portable sensor control system 10 can also find applications in other industries where monitoring cerebral hemodynamics is beneficial. For example, in the medical field, the system 10 can be used for patient monitoring in clinical settings, providing real-time data on cerebral oxygenation levels that can aid in the diagnosis and treatment of various neurological conditions. In the field of sports and fitness, the system 10 can be used to monitor the Physiological responses of athletes to physical exertion help optimize training regimens and prevent overtraining. In the field of occupational health and safety, System 10 can be used to monitor workers in high-risk or high-stress environments, such as mines, construction sites, or emergency services, providing valuable data that can inform interventions to improve worker safety and well-being.

[0128] It is appreciated that the concepts, systems, circuits, and techniques that are sought to be protected herein are not limited to use in the example applications described herein (e.g., aviation, medicine, sports and fitness, occupational health and safety), but may rather be useful in virtually any application where it is desired to monitor cerebral hemodynamic parameters in a portable and user-friendly format. Although particular embodiments and applications of this disclosure have been illustrated and described, it is understood that the disclosure is not limited to the precise constructs and compositions disclosed herein and that various modifications, changes, and variations may be apparent from the preceding descriptions without departing from the spirit and scope of the disclosure as defined in the appended claims.

[0129] Although exemplary embodiments of the invention have been described, it will be understood by those skilled in the art that various changes, omissions, and / or additions may be made, and equivalents may be substituted for their elements without departing from the spirit and scope of the invention. Furthermore, numerous modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is understood that the invention is not limited to the particular embodiments disclosed for the realization of this invention, but that the invention will include all realizations falling within the scope of the appended claims. Moreover, unless otherwise indicated, the use of the terms first, second, etc., does not denote any particular order or importance, but rather the terms first, second, etc., are used to distinguish one element from another.

Claims

1. Demands Portable sensor control system (10) for monitoring cerebral hemodynamic parameters of a user's head, the system (10) comprising: - at least one sensor device (20), each of the at least one sensor device (20) comprising: (i) at least one red light emitting module (21), said at least one red light emitting module (21) being configured to be positioned on the user's head and to emit light through a skin of the user's head; ii) at least one infrared light-emitting module (22), said infrared light-emitting module (22) being configured to be positioned on the user's head and to emit light through the skin of the user's head; iii) at least one light sensor (23), said at least one light sensor (23) being configured to detect the light emitted by the light-emitting modules (21, 22) and generate measurement data; an emission control module (24), said emission control module (24) being configured to control said at least one red light emission module (21) and said at least one infrared light emission module (22) as well as to receive measurement data from said at least one light sensor (23); (iv) a power supply module (25), said power supply module (25) being configured to receive power from a power source; (v) and a sensor communication module (26), said sensor communication module (26) being configured to exchange data at least with the emission control module (24) and a control communication module (46); - a control device (40), said control device (40) comprising: (i) the control communication module (46), said control communication module (46) being configured to exchange data at least with the sensor communication module (26); and ii) in which the control device (40) is offset from at least one sensor device (20) and the sensor devices (20) are offset from each other.

2. Portable sensor control system (10) according to claim 1, wherein at least one of the at least one sensor device (20) comprises an acceleration sensor (27), said acceleration sensor being configured to measure acceleration and generate acceleration data, and the emission control module (24) is configured to receive the acceleration data.

3. Portable sensor control system (10) according to any one of claims 1 or 2, wherein at least one of the at least one sensor device (20) comprises a temperature sensor (28), said temperature sensor being configured to measure temperature and generate temperature data, and wherein the emission control module (24) is configured to receive the temperature data.

4. Portable sensor control system (10) according to any one of claims 1 to 3, wherein at least one of the at least one sensor device (20) comprises a humidity sensor (29), said humidity sensor being configured to measure humidity levels and generate humidity data, and wherein the emission control module (24) is configured to receive the humidity data.

5. Portable sensor control system (10) according to any one of claims 1 to 4, wherein at least one of the at least one sensor device (20) comprises a pressure sensor (30), said pressure sensor being configured to measure pressure and generate pressure data, and wherein the emission control module (24) is configured to receive the pressure data.

6. A portable sensor control system (10) according to any one of claims 1 to 5, wherein the emission control module (24) is configured to calculate the user's head cerebral hemodynamic parameters based on the received data.

7. Portable sensor control system (10) according to claim 6, wherein the emission control module (24) is configured to generate an alert based on at least the calculated cerebral hemodynamic parameters.

8. Portable sensor control system (10) according to claim 7, wherein the sensor communication module (26) is configured to transmit the alert to the control communication module (46) and / or to an external device.

9. Portable sensor control system (10) according to any one of claims 1 to 8, wherein each of the sensor devices comprises two red light emitting modules (21) and two infrared light emitting modules (22).

10. Portable sensor control system (10) according to any one of claims 1 to 9, wherein each of the sensor devices comprises five light sensors (23).

11. Portable sensor control system (10) according to any one of claims 1 to 10, wherein the emission control module (24) is configured to calibrate the light emission modules (21, 22).

12. Portable sensor control system (10) according to any one of claims 1 to 11, wherein at least one red light emitting module (21) is configured to emit light at a wavelength of 750+50 nm.

13. Portable sensor control system (10) according to any one of claims 1 to 12, wherein at least one infrared light-emitting module (22) is configured to emit light at a wavelength of 850+50 nm.

14. A method for monitoring cerebral hemodynamic parameters of a user's head, said method being implemented by the portable sensor control system (10) according to claim 1, the method comprising: - initiating a measurement cycle (60) by the emission control module (24), the measurement cycle comprising a sequence of light emissions from the red light emission module (21) and the infrared light emission module (22); - emitting light (70) by the red light emission module (21) and by the infrared light emission module (22), the emitted light penetrating the skin of the user's head and the cerebral tissues; - detecting (80), by the light sensor (23), the light reflected by the cerebral tissues and generating data from indicative measurements of the absorption characteristics of brain tissues; - the calculation (90), by the emission control module (24), of cerebral hemodynamic parameters on the basis of measurement data, the parameters including the concentrations of oxyhemoglobin and deoxyhemoglobin indicative of the oxygenation state of the brain; - the generation of an alert (100) based on calculated cerebral hemodynamic parameters when the parameters indicate a deviation from a predetermined range of cerebral oxygenation levels.

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