A fiber sensing system based on quantum dot lifetime modulation characteristics

Abstract

The application discloses a kind of optical fiber sensing systems based on quantum dot lifetime modulation characteristics, it is related to high-end equipment manufacturing technical field, the present application includes: excitation control module, for producing adjustable excitation signal, the intensity, frequency and pulse width of the excitation signal can be programmed setting according to actual application scene;Optical excitation module is connected with the excitation control module, receives excitation signal and generates corresponding wavelength excitation light, and the optical excitation module includes laser diode or light-emitting diode as light source.The advantage is that: through the sensing mechanism of quantum dot, the lifetime modulation characteristics of quantum dot material are used as the core sensing mechanism, compared with the traditional light intensity sensing mode, the light path loss and light source fluctuation have higher resistance.

Description

Technical Field

[0001] This invention relates to the field of high-end equipment manufacturing technology, and in particular to an optical fiber sensing system based on the lifetime modulation characteristics of quantum dots. Background Technology

[0002] In industrial process control, high-end equipment manufacturing, power systems, rail transportation, new energy, and complex electromechanical systems, temperature is one of the key physical quantities characterizing equipment operating status, safety margin, and life assessment. Existing industrial temperature measurement solutions mainly adopt electrical contact measurement methods such as thermocouples, resistance temperature detectors (RTDs), and semiconductor temperature sensors.

[0003] Traditional sensors and signal links rely on electrical connections, making them susceptible to interference in environments with strong electromagnetic interference, high voltage, or complex grounding. They also pose electrical safety hazards in flammable, explosive, or high-voltage environments. Long-distance transmission and multi-point measurement wiring are complex, resulting in poor system reliability and maintainability. Furthermore, they are easily affected by environmental changes during long-term operation, leading to insufficient stability. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an optical fiber sensing system based on the lifetime modulation characteristics of quantum dots, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A fiber optic sensing system based on quantum dot lifetime modulation characteristics includes: The excitation control module is used to generate an adjustable excitation signal, the intensity, frequency and pulse width of which can be programmed and set according to the actual application scenario. An optical excitation module, connected to the excitation control module, receives excitation signals and generates excitation light of a corresponding wavelength. The optical excitation module includes a laser diode or a light-emitting diode as a light source. The optical fiber transmission module includes an input optical fiber and an output optical fiber, which are used to transmit the excitation light to the sensing end and transmit the optical response with lifetime modulation characteristics returned by the sensing end, respectively. A quantum dot sensing module, located at the sensing end, includes one or more quantum dot fluorescent materials. The quantum dot fluorescent materials generate an optical response with lifetime modulation characteristics under the action of excitation light, and the lifetime modulation characteristics change significantly with temperature. The photoelectric detection module, including a photodiode or an avalanche photodiode, is used to convert the optical response into an electrical signal; The signal acquisition module, connected to the photoelectric detection module, includes a high-speed analog-to-digital converter for high-precision sampling of electrical signals to acquire time-series data related to the lifetime modulation characteristics of quantum dots. The data processing module, connected to the signal acquisition module, includes a microprocessor or a digital signal processor, for extracting lifetime characteristic parameters based on the time series data, and generating a sensing result including temperature parameters through a preset algorithm. The sensing result may further include other environmental parameters such as humidity and pressure.

[0006] Furthermore, the quantum dot fluorescent material in the quantum dot sensing module is selected from binary or ternary quantum dots such as CdSe, CdTe, and InP, or their core-shell structure quantum dots. The emission wavelength and lifetime modulation characteristics of the quantum dot fluorescent material can be controlled by adjusting the size, composition, or surface modification of the quantum dots to meet the measurement requirements of different temperature ranges.

[0007] Furthermore, it also includes a filter component and a beam splitter component, which are disposed between the optical fiber transmission module and the photoelectric detection module. The filter component includes a bandpass filter or a long-pass filter, which is used to filter out excitation light and other non-target wavelength optical signals. The beam splitting component includes a beam splitter or fiber coupler, which is used to effectively separate the excitation light from the quantum dot lifetime modulation optical response, reduce the impact of excitation light crosstalk on the detection signal, and improve the system's accuracy in extracting lifetime modulation features and the signal-to-noise ratio.

[0008] Furthermore, the excitation control module also includes a temperature compensation circuit, which is used to automatically adjust the parameters of the excitation signal according to changes in ambient temperature, so as to ensure the stability and consistency of the excitation light. The excitation control module supports external trigger signal input, enabling synchronous control with external devices.

[0009] Furthermore, the photoelectric detection module also includes a preamplifier to amplify weak photoelectric signals and improve the detection sensitivity of the system. The photoelectric detection module supports multi-channel detection and can simultaneously monitor the optical responses returned by multiple quantum dot sensing modules.

[0010] Furthermore, the signal acquisition module also includes a digital filter for filtering the sampled time series data, removing noise interference, and improving the purity of the data; The signal acquisition module supports multiple sampling modes, such as equal-interval sampling and triggered sampling, to meet the needs of different application scenarios.

[0011] Furthermore, the data processing module also includes a data storage unit for storing historical sensing data, supporting data backtracking and analysis; The data processing module supports remote communication and can upload the sensing results to a cloud server or monitoring center via wired or wireless means to achieve remote monitoring and early warning.

[0012] Furthermore, the sensing end does not contain any electrical components and transmits signals entirely through optical fibers, making it suitable for complex industrial environments such as strong electromagnetic fields and high voltage, thereby improving the system's safety and environmental adaptability.

[0013] Compared with existing technologies, the advantages of this invention are: 1: By using the quantum dot sensing mechanism and taking the lifetime modulation characteristics of quantum dot materials as the core sensing mechanism, it has a higher tolerance to optical path loss and light source fluctuations compared to traditional light intensity sensing methods.

[0014] 2: By introducing optical crosstalk suppression and signal-to-noise ratio optimization mechanisms, filter components and beam splitting components are introduced to effectively distinguish and suppress the excitation light and quantum dot lifetime modulation optical response, thereby reducing the impact of excitation light crosstalk on the detection signal and improving the system's accuracy in extracting lifetime modulation features and the signal-to-noise ratio.

[0015] 3. Through a system-level, modular architecture, the system can carry out overall design at the system level, which facilitates multi-channel expansion, centralized control and industrial deployment, and improves high security and environmental adaptability. The sensing end does not contain electrical components, making it suitable for complex industrial environments such as strong electromagnetic fields and high voltage. Attached Figure Description

[0016] Figure 1 This is a system architecture diagram of the present invention; Figure 2 This is a flowchart of the present invention. Detailed Implementation

[0017] Example Reference Figures 1-2 A fiber optic sensing system based on quantum dot lifetime modulation characteristics, comprising: The excitation control module is used to generate an adjustable excitation signal. The intensity, frequency, and pulse width of the excitation signal can be programmed and set according to the actual application scenario. The excitation control module is responsible for generating adjustable excitation signals. The intensity, frequency, and pulse width of these signals can be programmed and set according to the actual application scenario to adapt to different measurement requirements. The high flexibility and programmability ensure that the system can adapt to various complex environments.

[0018] An optical excitation module, connected to an excitation control module, receives excitation signals and generates excitation light of a corresponding wavelength. The optical excitation module includes a laser diode or a light-emitting diode as a light source. The optical excitation module is closely connected to the excitation control module, receiving the excitation signal output by the module and generating excitation light of the corresponding wavelength according to the excitation signal. The light source can be a laser diode or a light-emitting diode, which has efficient and stable light output characteristics. There are various light sources to choose from, and the configuration can be optimized according to specific needs.

[0019] The optical fiber transmission module includes an input optical fiber and an output optical fiber, which are used to transmit excitation light to the sensing end and transmit the optical response with lifetime modulation characteristics returned by the sensing end, respectively. The fiber optic transmission module includes an input fiber and an output fiber, which are responsible for transmitting the excitation light to the sensing end and transmitting the optical response returned from the sensing end back to the detection end, respectively. This enables long-distance, lossless transmission of optical signals, ensuring the accuracy and reliability of the measurement signals. Fiber optic transmission has advantages such as resistance to electromagnetic interference and intrinsic safety, making it suitable for complex industrial environments.

[0020] A quantum dot sensing module, located at the sensing end, contains one or more quantum dot fluorescent materials. Under the action of excitation light, the quantum dot fluorescent materials generate an optical response with lifetime modulation characteristics, which change significantly with temperature. The quantum dot sensing module is located at the sensing end and is the core sensing element of the system. It contains one or more quantum dot fluorescent materials. These materials generate an optical response with lifetime modulation characteristics under the action of excitation light. Moreover, the lifetime modulation characteristics change significantly with temperature, exhibiting high sensitivity and high stability, and can accurately reflect temperature changes.

[0021] A photoelectric detection module, including a photodiode or an avalanche photodiode, is used to convert optical responses into electrical signals; The photoelectric detection module includes photoelectric conversion elements such as photodiodes or avalanche photodiodes, which convert the optical response returned by the quantum dot sensing module into an electrical signal for subsequent processing and analysis. It features high response speed, low noise, and ensures the accuracy and reliability of the electrical signal.

[0022] The signal acquisition module, connected to the photoelectric detection module, includes a high-speed analog-to-digital converter for high-precision sampling of electrical signals to acquire time-series data related to the lifetime modulation characteristics of quantum dots. The signal acquisition module is closely connected to the photoelectric detection module, receiving the electrical signals output by the module. It includes a high-speed analog-to-digital converter, which performs high-precision sampling of the electrical signals to acquire time-series data related to the lifetime modulation characteristics of quantum dots. It features high sampling rate and high precision, ensuring the integrity and accuracy of the time-series data.

[0023] The data processing module, connected to the signal acquisition module, includes a microprocessor or digital signal processor. It is used to extract lifetime characteristic parameters based on time series data and generate sensing results including temperature parameters through a preset algorithm. The sensing results may further include other environmental parameters such as humidity and pressure.

[0024] The data processing module is connected to the signal acquisition module, receiving its output time-series data, including data from a microprocessor or digital signal processor. Based on the time-series data, it extracts lifetime characteristic parameters and generates sensing results including temperature parameters using a preset algorithm. These sensing results can further include other environmental parameters such as humidity and pressure to meet diverse measurement needs. The module possesses powerful data processing capabilities and flexible algorithm configuration, ensuring the accuracy and real-time performance of the sensing results.

[0025] The quantum dot fluorescent material in the quantum dot sensing module is selected from binary or ternary quantum dots such as CdSe, CdTe, and InP, or their core-shell structure quantum dots. The emission wavelength and lifetime modulation characteristics of the quantum dot fluorescent material can be controlled by adjusting the size, composition, or surface modification of the quantum dots to meet the measurement requirements of different temperature ranges.

[0026] By using binary or ternary quantum dots such as CdSe, CdTe, and InP, and their core-shell structure variants as fluorescent materials for quantum dot sensing modules, and by employing methods such as size control, composition control, and surface modification, their emission wavelength and lifetime modulation characteristics can be finely controlled, thereby achieving high-precision measurements over different temperature ranges and improving the system's flexibility and adaptability.

[0027] It also includes a filter component and a beam splitter component, which are located between the optical fiber transmission module and the photoelectric detection module. The filter component includes a bandpass filter or a long-pass filter, which is used to filter out excitation light and other non-target wavelength optical signals. By setting up a filter assembly and a beam splitter assembly between the fiber optic transmission module and the photoelectric detection module, the performance of the optical measurement system is improved. The filter assembly, through the appropriate selection of different types of filters such as bandpass filters and longpass filters, can accurately filter out excitation light and other non-target wavelength light signals, effectively improving the purity of the light signal entering the photoelectric detection module and reducing interference. The beam splitter assembly has the ability to separate mixed light signals based on optical characteristics, enabling the system to process multiple light signals with different components simultaneously, realizing the synchronous measurement and analysis of multiple target light signals, and enhancing the system's multifunctionality and measurement efficiency.

[0028] The beam splitting assembly, including a beam splitter or fiber coupler, is used to effectively separate the excitation light from the quantum dot lifetime modulation optical response, reduce the impact of excitation light crosstalk on the detection signal, and improve the system's accuracy in extracting lifetime modulation features and the signal-to-noise ratio.

[0029] The beam splitter utilizes the reflection and refraction properties of light to reflect the excitation light onto a specific optical path, allowing the quantum dot fluorescence signal to pass through for detection. The fiber optic coupler, on the other hand, uses the fiber optic coupling principle to achieve precise separation of the excitation light and fluorescence signal in the fiber optic system. It has the advantages of low insertion loss and good transmission stability, effectively separating the excitation light from the quantum dot lifetime modulation optical response, thus reducing the impact of excitation light crosstalk on the detection signal at the source.

[0030] The excitation control module also includes a temperature compensation circuit, which automatically adjusts the parameters of the excitation signal according to changes in ambient temperature to ensure the stability and consistency of the excitation light. The excitation control module is equipped with a temperature compensation circuit, which can automatically adjust the excitation signal parameters according to changes in ambient temperature, thereby ensuring the stability and consistency of the excitation light.

[0031] The excitation control module supports external trigger signal input to achieve synchronous control with external devices. By supporting external trigger signal input, the excitation control module effectively achieves synchronous control with external devices.

[0032] The photoelectric detection module also includes a preamplifier to amplify weak photoelectric signals and improve the system's detection sensitivity. The photoelectric detection module supports multi-channel detection and can simultaneously monitor the optical responses returned by multiple quantum dot sensing modules.

[0033] The photoelectric detection module effectively amplifies the weak photoelectric signals returned by the quantum dot sensing module through a built-in preamplifier, reduces noise interference, and significantly improves the detection sensitivity of the system, enabling the system to capture more subtle optical changes. At the same time, the module supports multi-channel detection, which can monitor the optical responses returned by multiple quantum dot sensing modules simultaneously, realizing parallel data processing and real-time acquisition, and greatly improving the monitoring efficiency and comprehensiveness of the system.

[0034] The signal acquisition module also includes a digital filter, which is used to filter the sampled time series data, remove noise interference, and improve the purity of the data; The signal acquisition module supports multiple sampling modes, such as equal-interval sampling and triggered sampling, to meet the needs of different application scenarios.

[0035] The signal acquisition module uses a built-in digital filter to effectively filter the sampled time series data, accurately removing various noise interferences and significantly improving the purity of the data, providing a reliable guarantee for subsequent data analysis. The module supports multiple sampling modes such as equal-interval sampling and triggered sampling, and can flexibly select the appropriate sampling method according to the characteristics and needs of different application scenarios to achieve accurate signal acquisition and effective monitoring.

[0036] The data processing module also includes a data storage unit for storing historical sensing data, supporting data backtracking and analysis; The data processing module supports remote communication, and can upload the sensing results to the cloud server or monitoring center via wired or wireless means to achieve remote monitoring and early warning.

[0037] The data storage unit in the data processing module can securely and reliably store historical sensing data, and support efficient data backtracking and analysis through reasonable classification and organization, providing a strong basis for system optimization decisions and value mining. The module has a remote communication function, which can upload sensing results to the cloud server or monitoring center in real time through wired or wireless communication, realizing remote monitoring and early warning, greatly improving the system's management efficiency and response speed.

[0038] The sensing end contains no electrical components and transmits signals entirely through optical fibers. It is suitable for complex industrial environments such as strong electromagnetic fields and high voltage, improving the system's safety and environmental adaptability. The sensing end adopts a design without electrical components and uses optical fibers to transmit signals, which can be well adapted to complex industrial scenarios such as strong electromagnetic fields and high voltage, effectively enhancing the system's safety and environmental adaptability.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A fiber optic sensing system based on quantum dot lifetime modulation characteristics, characterized in that, include: The excitation control module is used to generate an adjustable excitation signal, the intensity, frequency and pulse width of which can be programmed and set according to the actual application scenario. An optical excitation module, connected to the excitation control module, receives excitation signals and generates excitation light of a corresponding wavelength. The optical excitation module includes a laser diode or a light-emitting diode as a light source. The optical fiber transmission module includes an input optical fiber and an output optical fiber, which are used to transmit the excitation light to the sensing end and transmit the optical response with lifetime modulation characteristics returned by the sensing end, respectively. A quantum dot sensing module, located at the sensing end, includes one or more quantum dot fluorescent materials. The quantum dot fluorescent materials generate an optical response with lifetime modulation characteristics under the action of excitation light, and the lifetime modulation characteristics change significantly with temperature. The photoelectric detection module, including a photodiode or an avalanche photodiode, is used to convert the optical response into an electrical signal; The signal acquisition module, connected to the photoelectric detection module, includes a high-speed analog-to-digital converter for high-precision sampling of electrical signals to acquire time-series data related to the lifetime modulation characteristics of quantum dots. The data processing module, connected to the signal acquisition module, includes a microprocessor or a digital signal processor, for extracting lifetime characteristic parameters based on the time series data, and generating a sensing result including temperature parameters through a preset algorithm. The sensing result may further include other environmental parameters such as humidity and pressure.

2. The fiber optic sensing system based on quantum dot lifetime modulation characteristics according to claim 1, characterized in that, The quantum dot fluorescent material in the quantum dot sensing module is selected from binary or ternary quantum dots such as CdSe, CdTe, and InP, or their core-shell structure quantum dots. The emission wavelength and lifetime modulation characteristics of the quantum dot fluorescent material can be controlled by adjusting the size, composition, or surface modification of the quantum dots to meet the measurement requirements of different temperature ranges.

3. The fiber optic sensing system based on quantum dot lifetime modulation characteristics according to claim 1, characterized in that, It also includes a filter component and a beam splitter component, which are disposed between the optical fiber transmission module and the photoelectric detection module. The filter component includes a bandpass filter or a long-pass filter, which is used to filter out excitation light and other non-target wavelength optical signals. The beam splitting component includes a beam splitter or fiber coupler, which is used to effectively separate the excitation light from the quantum dot lifetime modulation optical response, reduce the impact of excitation light crosstalk on the detection signal, and improve the system's accuracy in extracting lifetime modulation features and the signal-to-noise ratio.

4. The fiber optic sensing system based on quantum dot lifetime modulation characteristics according to claim 1, characterized in that, The excitation control module also includes a temperature compensation circuit, which is used to automatically adjust the parameters of the excitation signal according to changes in ambient temperature, so as to ensure the stability and consistency of the excitation light. The excitation control module supports external trigger signal input, enabling synchronous control with external devices.

5. The fiber optic sensing system based on quantum dot lifetime modulation characteristics according to claim 1, characterized in that, The photoelectric detection module also includes a preamplifier to amplify weak photoelectric signals and improve the detection sensitivity of the system. The photoelectric detection module supports multi-channel detection and can simultaneously monitor the optical responses returned by multiple quantum dot sensing modules.

6. The fiber optic sensing system based on quantum dot lifetime modulation characteristics according to claim 1, characterized in that, The signal acquisition module also includes a digital filter, which is used to filter the sampled time series data, remove noise interference, and improve the purity of the data; The signal acquisition module supports multiple sampling modes, such as equal-interval sampling and triggered sampling, to meet the needs of different application scenarios.

7. The fiber optic sensing system based on quantum dot lifetime modulation characteristics according to claim 1, characterized in that, The data processing module also includes a data storage unit for storing historical sensing data, supporting data backtracking and analysis; The data processing module supports remote communication and can upload the sensing results to a cloud server or monitoring center via wired or wireless means to achieve remote monitoring and early warning.

8. The fiber optic sensing system based on quantum dot lifetime modulation characteristics according to claim 1, characterized in that, The sensing end does not contain any electrical components and transmits signals entirely through optical fibers, making it suitable for complex industrial environments such as strong electromagnetic fields and high voltage, thereby improving the system's safety and environmental adaptability.

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