Wearable respiratory monitoring device based on ultra-low heat capacity thermistor

Abstract

This invention discloses a wearable respiratory monitoring device based on an ultra-low heat capacity thermistor, belonging to the field of respiratory monitoring technology. It includes: an ultra-low heat capacity thermistor, mounted on a wearable carrier close to the human respiratory airflow path, for real-time sensing of temperature changes caused by respiratory airflow and converting them into measurable resistance changes; a resistance acquisition module for real-time acquisition of the resistance changes of the ultra-low heat capacity thermistor and outputting a resistance signal; a controller for receiving the resistance signal and converting it into corresponding temperature data according to a preset resistance-temperature dependence relationship; and a preset algorithm for analyzing and processing the temperature data to identify various respiratory states, while generating temperature change curves, respiratory frequency, and average respiratory temperature difference corresponding to each respiratory state; and a power supply module for providing operating voltage to the controller. This invention balances monitoring accuracy and device portability, meeting the needs of daily life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of respiratory monitoring, and particularly relates to a wearable respiratory monitoring device based on an ultra-low heat capacity thermistor. BACKGROUND

[0002] Traditional respiratory monitoring equipment has the problem of insufficient portability and wearability, which is mainly due to the fact that existing respiratory monitoring devices are usually large in size and are not easy to carry around, and are difficult to wear for a long time. In this case, it is difficult to achieve continuous respiratory monitoring during the day and at night, especially for people who need to monitor their respiratory conditions for a long time. The existing technology cannot meet their needs. In addition, traditional equipment often cannot balance the accuracy of monitoring and the portability of the equipment, which limits its widespread application in daily life. SUMMARY

[0003] Therefore, the present application provides a wearable respiratory monitoring device based on an ultra-low heat capacity thermistor to solve the technical problems in the related art.

[0004] The present application provides a wearable respiratory monitoring device based on an ultra-low heat capacity thermistor, comprising:

[0005] At least one ultra-low heat capacity thermistor is arranged on a wearable carrier close to the respiratory airflow path of the human body, for real-time sensing of temperature changes caused by respiratory airflow, and converting the temperature changes into measurable resistance changes;

[0006] A resistance acquisition module is electrically connected to the ultra-low heat capacity thermistor, for real-time acquisition of resistance changes of the ultra-low heat capacity thermistor, and output of resistance signals;

[0007] A controller is electrically connected to the resistance acquisition module, for receiving the resistance signals, and converting the resistance signals into corresponding temperature data according to a pre-set resistance-temperature dependence relationship; and using a pre-set algorithm to analyze and process the temperature data to identify various respiratory states, while generating temperature change curves, respiratory frequencies and average temperature differences corresponding to various respiratory states; the respiratory states include normal respiratory state, deep breathing state and apnea state;

[0008] A power module is electrically connected to the controller, for providing working voltage for the controller.

[0009] In an optional embodiment, the wearable carrier includes at least one of a mask, a wearable mask, and a flexible substrate;

[0010] The ultra-low heat capacity thermistor is embedded in the mask or the wearable mask, or attached to one side of the flexible substrate;

[0011] The other side of the flexible substrate is coated with an adhesive material; when the wearable carrier is a flexible substrate, the side coated with the adhesive material is used to directly attach to the position below the nostril outlet of the human body.

[0012] In an alternative embodiment, the ultra-low thermal capacity thermistor comprises a plurality of

[0013] The plurality of ultra-low thermal capacity thermistors are embedded in the mask or wearable mask in a two-dimensional array arrangement, or attached to one side of the flexible substrate.

[0014] In an alternative embodiment, the controller and the resistance acquisition module are integrated;

[0015] The ultra-low thermal capacity thermistor is connected to the resistance acquisition module by a soft connection or a hard connection.

[0016] In an alternative embodiment, the controller comprises:

[0017] The digital-to-analog conversion unit is electrically connected to the resistance acquisition module, used to receive the resistance signal and convert the resistance signal into a corresponding digital signal;

[0018] The signal processing unit is electrically connected to the digital-to-analog conversion unit, used to receive the digital signal and convert the digital signal into temperature data according to a pre-set resistance-temperature dependence; and calibrate and format the temperature data packet, and send the processed data packet to the data queue;

[0019] The breathing state analysis unit is electrically connected to the signal processing unit, used to obtain the data packet in the queue and perform time-frequency analysis on the data packet using a spectrum analysis method; and convert the analysis result into an amplitude scale diagram, and identify various breathing states according to the amplitude scale diagram;

[0020] The data output unit is electrically connected to the signal processing unit and the breathing state analysis unit, respectively, used to generate temperature change curves, breathing frequencies and average temperature differences corresponding to various breathing states according to the identified breathing states, time-frequency analysis results and temperature data in the data packet; the breathing states include: normal breathing state, deep breathing state and apnea state;

[0021] The power management unit is electrically connected to the power module, used to control the power module to provide a stable working voltage for the controller, and control the power module to enter a low-power mode when the controller is in a non-working state.

[0022] In an alternative embodiment, the controller further comprises:

[0023] The data display unit is connected with the data output unit, and is used for obtaining a temperature change curve corresponding to each position of the ultra-low heat capacity thermistor, and calculating a temperature difference between adjacent ultra-low heat capacity thermistors to generate a temperature difference change graph in a two-dimensional matrix form.

[0024] In an alternative embodiment, the ultra-low heat capacity thermistor comprises a substrate, a temperature-sensitive resistance film and a lead electrode; the temperature-sensitive resistance film is arranged on the upper surface of the substrate and is provided with a through hole; the lead electrode is arranged in the through hole in an upper and lower interconnection mode, and the lead electrode and the upper surface of the temperature-sensitive resistance film are on the same horizontal line.

[0025] In an alternative embodiment, the temperature resistance coefficient of the ultra-low heat capacity thermistor is greater than 0.5*10 -3 ℃ -1 ; the thickness of the temperature-sensitive resistance film is 5-100 nm; and the thermal conductivity coefficient of the substrate is greater than 50 W / (m*K).

[0026] In an alternative embodiment, the temperature-sensitive resistance film is in the shape of a water drop with two sharp parts connected, and the region where the sharp parts are connected is a temperature-sensitive region.

[0027] The present application has the following advantages:

[0028] 1. High sensitivity and real-time performance: the ultra-low heat capacity thermistor (temperature resistance coefficient > 0.5*10 -3 ℃ -1 , film thickness 5-100 nm) combined with the high thermal conductivity substrate (> 50 W / (m*K)) can quickly respond to the small temperature change caused by the respiratory airflow, realize millisecond-level signal acquisition, and accurately distinguish normal breathing, deep breathing and apnea state.

[0029] 2. Spatial resolution and visualization: through the two-dimensional array arrangement of the sensor network combined with the sharp end focusing design of the water drop-shaped temperature-sensitive film, a two-dimensional temperature difference change graph can be generated to locate the abnormal airflow area and assist in diagnosing the nasal structure problem.

[0030] 3. Comfort and clinical adaptability: the flexible carrier (mask / mask / medical silicone base material) combined with the adhesive attachment design ensures comfortable wearing; multi-dimensional data output (respiratory frequency, average temperature difference, temperature curve) supports remote medical access and improves the early screening ability of respiratory-related diseases.

[0031] The device of the present application comprehensively realizes high precision, low power consumption and wearing comfort of respiratory monitoring, and is suitable for daily respiratory monitoring, night apnea monitoring, sports health management and clinical auxiliary diagnosis scenes. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0033] Figure 1 is a structural schematic diagram of a wearable breath monitoring device based on an ultra-low thermal capacity thermistor according to an embodiment of the present application;

[0034] Figure 2 is a position schematic diagram of an ultra-low thermal capacity thermistor installed in a soft mask according to an embodiment of the present application;

[0035] Figure 3 is a position schematic diagram of an ultra-low thermal capacity thermistor installed in a hard mask according to an embodiment of the present application;

[0036] Figure 4 is a position schematic diagram of an ultra-low thermal capacity thermistor attached below the air outlet of a nostril according to an embodiment of the present application;

[0037] Figure 5 is a program running logic block diagram of a controller according to an embodiment of the present application;

[0038] Figure 6 is an amplitude scale diagram of an embodiment of the present application;

[0039] Figure 7 is a temperature change curve diagram of various respiratory states according to an embodiment of the present application; wherein (a) is a temperature change curve diagram of normal respiratory state; (b) is a temperature change curve diagram of deep breathing state; (c) is a temperature change curve diagram of apnea state.

[0040] Figure 8 is a temperature difference change diagram in the form of a two-dimensional matrix corresponding to deep breathing state according to an embodiment of the present application;

[0041] Figure 9 is a structural schematic diagram of an ultra-low thermal capacity thermistor according to an embodiment of the present application;

[0042] Figure 10 is a plane schematic diagram of an ultra-low thermal capacity thermistor according to an embodiment of the present application;

[0043] Reference signs:

[0044] 1, base; 2, temperature-sensitive resistance film; 21, through hole; 3, lead electrode. DETAILED DESCRIPTION

[0045] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0046] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to simplify the description of the present application, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements, it can be wireless connection, or wired connection. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict between them.

[0049] As shown in Figure 1 The present application provides a wearable breath monitoring device based on ultra-low thermal capacity thermistor, comprising: at least one ultra-low thermal capacity thermistor, resistance acquisition module, controller and power module.

[0050] Specifically, the ultra-low thermal capacity thermistor is arranged on the wearable carrier close to the human respiratory airflow path, for real-time sensing of temperature change caused by respiratory airflow, and converting the temperature change into measurable resistance change.

[0051] Among them, the ultra-low thermal capacity thermistor is a special type of thermistor. Compared with ordinary thermistors, the ultra-low thermal capacity thermistor has a smaller size, only millimeter level, which can be more conveniently integrated into the wearable carrier without occupying too much space, and has higher wearability.

[0052] At the same time, compared with ordinary thermistors, the ultra-low heat capacity thermistor has extremely low heat capacity, which can absorb or release heat faster, thereby responding to temperature changes quickly. This feature makes the ultra-low heat capacity thermistor have unique advantages in occasions that require fast temperature monitoring.

[0053] The resistance acquisition module is electrically connected with the ultra-low heat capacity thermistor, and is used for acquiring the resistance change of the ultra-low heat capacity thermistor in real time and outputting a resistance signal.

[0054] The controller is electrically connected with the resistance acquisition module, and is used for receiving the resistance signal, converting the resistance signal into corresponding temperature data according to a preset resistance-temperature dependence relationship, and analyzing and processing the temperature data by using a preset algorithm to identify various respiratory states, and generating temperature change curves, respiratory frequencies and average temperature differences corresponding to various respiratory states. The respiratory states include normal respiratory state, deep respiratory state and respiratory pause state.

[0055] The preset resistance-temperature dependence relationship is calibrated by the physical properties of the thermistor in the ultra-low heat capacity thermistor.

[0056] The expression of the resistance-temperature dependence relationship is:

[0057]

[0058] wherein, R0 is the initial resistance value of the thermistor, which is used as a reference value for calculating the resistance value at other temperatures; T is the current temperature of the thermistor, which is a key factor affecting the resistance value; B is the temperature coefficient, which determines the sensitivity of the resistance to temperature change. k The greater the value is, the more significant the change of the resistance with temperature is; R R is the resistance value at the current temperature.

[0059] Based on the preset resistance-temperature dependence relationship and the current resistance value of the thermistor, the temperature value corresponding to the current resistance value can be determined, which is convenient for subsequent analysis and processing.

[0060] The power module is electrically connected with the controller, and is used for providing working voltage for the controller, and thereby providing working power source for the entire wearable respiratory monitoring device.

[0061] Preferably, the power module can be a battery.

[0062] In an alternative embodiment, the controller and the resistance acquisition module are integrated in one design.

[0063] Of course, the controller and the resistance acquisition module can also be designed separately.

[0064] The ultra-low heat capacity thermistor is connected to the resistance acquisition module through a soft connection or a hard connection, which can ensure stable signal transmission while taking into account the flexibility and comfort of the device worn.

[0065] In an alternative embodiment, as shown in Figures 2-4 The wearable carrier includes at least one of a mask, a wearable mask, and a flexible substrate.

[0066] The mask includes, but is not limited to, a general child / adult mask, a medical mask, a daily protective mask, an industrial dust mask, etc.

[0067] The ultra-low heat capacity thermistor is embedded in the mask or the wearable mask, or attached to one side of the flexible substrate.

[0068] The other side of the flexible substrate is coated with an adhesive material; when the wearable carrier is a flexible substrate, the side coated with the adhesive material is used to directly attach to the position below the nostril outlet of the human body, as shown in Figure 4

[0069] It should be noted that as long as the installation position of the ultra-low heat capacity thermistor can ensure that it does not come into contact with the skin, any other arrangement can achieve monitoring of the respiratory temperature.

[0070] In an alternative embodiment, the ultra-low heat capacity thermistor includes a plurality of

[0071] The plurality of ultra-low heat capacity thermistors are arranged in a two-dimensional array and embedded in the mask or the wearable mask, or attached to one side of the flexible substrate.

[0072] Preferably, the number of ultra-low heat capacity thermistors is 1-30.

[0073] In an alternative embodiment, the controller includes a digital-to-analog conversion unit, a signal processing unit, a respiratory state analysis unit, a data output unit, and a power management unit.

[0074] Specifically, the digital-to-analog conversion unit (ADC) is electrically connected to the resistance acquisition module, for receiving the resistance signal and converting the resistance signal into a corresponding digital signal.

[0075] The signal processing unit is electrically connected to the digital-to-analog conversion unit, for receiving the digital signal and converting the digital signal into temperature data according to a pre-set resistance-temperature dependence relationship; and calibrating and formatting the temperature data packet, and sending the processed data packet to a data queue.

[0076] ​Specifically, the signal processing unit first reads the ADC data to obtain the raw data input; then it performs data conversion (resistance value to temperature value) and calibration to ensure data accuracy and consistency; subsequently, it formats the data packet to standardize the data format for subsequent processing; finally, it sends the processed data packet to the data queue to complete the temporary storage and transmission preparation of the data, such as... Figure 5 Task 1 is shown.

[0077] The respiratory state analysis unit, electrically connected to the signal processing unit, is used to acquire data packets in the queue and perform time-frequency analysis on the data packets using a spectrum analysis method; and to convert the analysis results into an amplitude scale diagram and identify various respiratory states based on the amplitude scale diagram.

[0078] Specifically, the respiratory status analysis unit retrieves data from the data queue, processes the data, performs analysis or calculations on the received data, and ultimately stores or transmits the data, completing the final data processing and output. Figure 5 Task 2 is shown.

[0079] This invention enables orderly collaboration through task allocation and utilizes a data queue as an intermediate bridge to realize a complete process from ADC data acquisition and processing to final storage or transmission. This ensures the efficiency and logic of data processing and is suitable for application scenarios with clear division of labor and sequence requirements in the data processing process, thereby improving the standardization and reliability of system data processing.

[0080] Secondly, in the respiratory state analysis unit, a spectral analysis method is used to perform time-frequency analysis on the data packets, involving a respiratory state analysis technique based on amplitude scaling diagrams. By performing time-frequency analysis on the temperature data in the data packets and converting it into amplitude scaling diagrams, the characteristics of different respiratory states are visually presented, such as... Figure 6 As shown: Normal breathing (0.35Hz), deep breathing (0.18Hz), mouth breathing, and sleep apnea, etc. Figure 6 It exhibits a clear time-frequency dimension. Utilizing the visualization capabilities of amplitude scaling diagrams, this technology accurately distinguishes various respiratory states, providing a clear basis for respiratory status monitoring. It helps to promptly identify respiratory abnormalities, improves the accuracy and effectiveness of respiratory monitoring, and can be applied to respiratory monitoring scenarios in fields such as healthcare.

[0081] The data output unit is electrically connected to the signal processing unit and the respiratory state analysis unit, respectively. It is used to generate temperature change curves, respiratory rates and average respiratory temperature differences corresponding to various respiratory states based on the identified respiratory state, time-frequency analysis results and temperature data in the data packet. The respiratory states include: normal breathing state, deep breathing state and apnea state.

[0082] For example, such asFigure 7 As shown, Figure 7 (a) in the figure is the temperature change curve during normal breathing, with a respiratory rate of 21 breaths / minute and an average respiratory temperature difference of 0.91℃. Figure 7 (b) in the figure shows the temperature change curve during deep breathing, with a breathing rate of 11 breaths / minute and an average temperature difference of 1.68℃. Figure 7 (c) in the figure represents the temperature change curve during breath-holding.

[0083] The power management unit is electrically connected to the power module and is used to control the power module to provide a stable operating voltage to the controller, and to control the power module to enter a low-power mode when the controller is not in operation.

[0084] In one optional implementation, the controller further includes: a data display unit;

[0085] Specifically, the data display unit is connected to the data output unit to obtain the temperature change curves corresponding to the ultra-low heat capacity thermistors at various locations; and to calculate the temperature difference between adjacent ultra-low heat capacity thermistors and generate a two-dimensional matrix-style temperature difference change map.

[0086] For example, such as Figure 8 As shown, using the temperature difference change graph corresponding to deep breathing as an example, the temperature difference change (ΔT, unit: ℃) during deep breathing is presented in a two-dimensional matrix. The horizontal and vertical axes represent parameters at different locations, and the values ​​in each cell accurately indicate the temperature difference at the corresponding location. The color gradient intuitively reflects the magnitude of the temperature difference. This visualization method clearly shows the temperature change characteristics of each region during deep breathing, providing intuitive data support for in-depth analysis of the heat transfer mechanism during breathing. It helps to optimize the layout of temperature sensors or respiratory monitoring algorithms, and improves the accuracy and reliability of wearable devices in monitoring respiratory-related physiological parameters.

[0087] In one alternative implementation, such as Figure 9 and Figure 10 As shown, the ultra-low heat capacity thermistor includes a substrate 1, a temperature-sensing resistance film 2, and lead electrodes 3; the temperature-sensing resistance film 2 is disposed on the upper surface of the substrate 1 and has a through hole 21; the lead electrodes 3 are disposed in the through hole 21 in an interconnected manner, and the upper surfaces of the lead electrodes 3 and the temperature-sensing resistance film 2 are on the same horizontal line.

[0088] This invention is based on the fabrication of microelectromechanical interconnect structure to transfer the lead of lead electrode 3 to the bottom of the device, so as to achieve unobstructed temperature sensing plane, high device integration and easy expansion into high-density sensor array.

[0089] In one alternative implementation, the temperature resistivity of the ultra-low heat capacity thermistor is greater than 0.5 × 10⁻⁶. -3 ℃-1 The thickness of the temperature sensing resistance film is 5nm-100nm, and the thermal conductivity of the substrate is greater than 50W / (m.K).

[0090] Preferably, the substrate is selected from, but not limited to, hard materials such as silicon substrate, glass substrate, or flexible materials such as polyimide, thermoplastic polyurethane elastomer, etc.

[0091] In an alternative embodiment, as shown in Figure 10 The temperature sensing resistance film has a shape of a water drop with two sharp ends connected, and the area where the two sharp ends are connected is the temperature sensing area.

[0092] Although the embodiments of the present application have been described with reference to the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes are intended to fall within the scope of the present application defined by the appended claims.

Claims

1. A wearable breath monitoring device based on ultra-low thermal mass thermistor, characterized in that, The application relates to a wearable device for monitoring respiratory state, comprising: at least one ultra-low thermal capacity thermistor arranged on a wearable carrier close to a human respiratory airflow path, for sensing temperature changes caused by respiratory airflow in real time and converting the temperature changes into measurable resistance changes; a resistance acquisition module electrically connected with the ultra-low thermal capacity thermistor, for acquiring the resistance changes of the ultra-low thermal capacity thermistor in real time and outputting resistance signals; a controller electrically connected with the resistance acquisition module, for receiving the resistance signals and converting the resistance signals into corresponding temperature data according to a preset resistance-temperature dependence relationship, and for analyzing and processing the temperature data by using a preset algorithm to identify various respiratory states and generate temperature change curves, respiratory frequencies and respiratory average temperature differences corresponding to the various respiratory states; the respiratory states include normal respiratory state, deep breathing state and apnea state; a power module electrically connected with the controller, for providing working voltage for the controller; the ultra-low thermal capacity thermistor comprises a substrate, a temperature-sensing resistance film and lead electrodes; the temperature-sensing resistance film is arranged on the upper surface of the substrate and is provided with a through hole; the lead electrodes are arranged in the through hole in an upper-lower interconnection mode, and the lead electrodes and the upper surface of the temperature-sensing resistance film are on the same horizontal line; The temperature resistance coefficient of the ultra-low heat capacity thermistor is greater than 0.5*10 -3 ℃ -1 -5; the thickness of the temperature sensing resistance film is 5nm-100nm; and the heat conductivity coefficient of the substrate is greater than 50W / (m*K). the temperature-sensing resistance film has a shape of a water drop with two sharp parts connected, and a temperature-sensing area is arranged at the position where the two sharp parts are connected; the controller comprises: a digital-analog conversion unit electrically connected with the resistance acquisition module, for receiving the resistance signals and converting the resistance signals into corresponding digital signals; a signal processing unit electrically connected with the digital-analog conversion unit, for receiving the digital signals, converting the digital signals into temperature data according to a preset resistance-temperature dependence relationship, calibrating and formatting the temperature data, and sending the processed data packets to a data queue; a respiratory state analysis unit electrically connected with the signal processing unit, for acquiring the data packets in the queue, performing time-frequency analysis on the data packets by using a spectrum analysis method, converting the analysis results into an amplitude scale diagram, and identifying various respiratory states according to the amplitude scale diagram; a data output unit electrically connected with the signal processing unit and the respiratory state analysis unit, for generating temperature change curves, respiratory frequencies and respiratory average temperature differences corresponding to various respiratory states according to the identified respiratory states, the time-frequency analysis results and the temperature data in the data packets; the respiratory states include normal respiratory state, deep breathing state and apnea state; a power management unit electrically connected with the power module, for controlling the power module to provide stable working voltage for the controller, and controlling the power module to enter a low-power consumption mode when the controller is in a non-working state.

2. The apparatus of claim 1, wherein, the wearable carrier comprises at least one of a mask, a wearable mask and a flexible substrate; the ultra-low thermal capacity thermistor is embedded in the mask or the wearable mask or attached to one side of the flexible substrate. The other side of the flexible substrate is coated with an adhesive material; when the wearable carrier is a flexible substrate, the side coated with the adhesive material is used to directly attach to the position below the air outlet of the human nostril.

3. The apparatus of claim 2, wherein, The ultra-low heat capacity thermistor includes a plurality of; The plurality of ultra-low heat capacity thermistors are embedded in the mask or wearable mask in a two-dimensional array arrangement, or attached to one side of the flexible substrate.

4. The apparatus of claim 1, wherein, The controller and the resistance acquisition module are integrated; The ultra-low heat capacity thermistor is connected to the resistance acquisition module by a soft connection or a hard connection.

5. The apparatus of claim 3, wherein, The controller further includes: The data display unit is connected with the data output unit, used to obtain the temperature change curve corresponding to the ultra-low heat capacity thermistor at each position; and calculate the temperature difference between adjacent ultra-low heat capacity thermistors, and generate a temperature difference change graph in the form of a two-dimensional matrix.

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