Human recognition system based on thermopile array

Abstract

The utility model provides a kind of human body identification system based on thermoelectric array.The system can accurately control the refrigerating capacity of semiconductor refrigerating component according to actual ambient temperature and detection requirement by additionally arranging semiconductor refrigerating component and temperature regulating control unit, provide stable and suitable cold end temperature for thermoelectric array infrared sensor, improve the reliability and stability of human body identification, effectively solve the influence of ambient temperature, have strong environmental adaptability.The human body identification system provided in the embodiment has relatively simple structure, is easy to integrate between modules, and is convenient to install in various devices or scenes requiring human body identification, such as smart home system, security monitoring device, intelligent air conditioner, etc., and has good application and promotion prospect.

Description

Technical Field

[0001] This utility model relates to the field of human body recognition technology, and in particular to a human body recognition system based on a thermopile array. Background Technology

[0002] Human body recognition technology based on thermopile arrays utilizes thermopile array infrared sensors. It identifies individuals by detecting the difference in infrared radiation between the human body and the environment, combined with algorithms. A thermopile array infrared sensor is a non-contact temperature / radiation detector based on the Seebeck effect. It converts absorbed infrared radiation into an electrical signal to measure the temperature of an object. The working principle of a thermopile array infrared sensor is as follows: Based on the Seebeck effect, when the infrared radiation from a target object passes through an infrared filter and illuminates the sensor's absorption region (hot junction), the absorption region converts the infrared radiation into heat energy, raising its temperature and becoming the hot end of the thermopile. The reference region (cold junction) of the sensor has a relatively stable temperature, becoming the cold end of the thermopile. The internal temperature difference between the hot and cold ends creates a potential difference. Each pair of thermocouples generates a small thermoelectric potential due to the temperature difference. A large number of thermocouples connected in series amplify these small voltages, ultimately outputting an electrical signal related to the temperature of the target object. Based on the output electrical signal, the intensity and temperature information of the infrared radiation can be inferred, thus enabling the detection and identification of the human body. As a device capable of detecting infrared radiation and converting it into electrical signals, thermopile array infrared sensors have broad application prospects in the field of human body recognition.

[0003] In smart home scenarios, human body recognition technology based on thermopile arrays can endow home appliances with "sensing" capabilities. For example, smart air conditioners can automatically adjust airflow direction, temperature, and speed by recognizing the location, number, and activity status of people indoors, creating a personalized and comfortable environment; smart lighting systems can automatically switch lights on and off and adjust brightness based on human movement patterns, meeting lighting needs while achieving energy conservation and consumption reduction; smart bathroom systems can automatically control faucets, toilets, and other appliances based on human movement patterns and postures, achieving the goal of intelligent bathroom products. This intelligent human-computer interaction experience not only enhances the convenience of home life but also provides technological support for building green and energy-saving smart homes.

[0004] However, when the ambient temperature is close to human body temperature, the internal temperature difference of the thermopile array infrared sensor is insufficient to generate the potential difference necessary for infrared absorption. Consequently, the thermopile array infrared sensor struggles to accurately capture differences in infrared radiation emitted by the human body, resulting in ineffective human identification. For example, in some constant-temperature indoor environments, or under specific seasonal and climatic conditions, where the ambient temperature is close to human body temperature, traditional thermopile array human identification systems often experience misjudgments or fail to identify individuals, significantly limiting their application in real-world scenarios. Summary of the Invention

[0005] The purpose of this invention is to provide a human body recognition system based on a thermopile array, which can solve the problem that the thermopile array cannot accurately recognize the human body when the ambient temperature is close to the human body temperature, thereby improving the accuracy and reliability of human body recognition.

[0006] To achieve the above objectives, this utility model provides a human body recognition system based on a thermopile array, comprising: a thermopile array infrared sensor, the thermopile array infrared sensor having a functionally separated first hot end and a first cold end, the thermopile array infrared sensor being able to simultaneously measure infrared radiation signals from multiple points within a detection range and convert them into electrical signals; an ambient temperature sensor for real-time detection of the current ambient temperature within the detection range; a temperature regulation control unit for outputting a temperature regulation control signal when determining that the first difference between the current ambient temperature and the human body temperature is less than or equal to a preset threshold, the temperature regulation control signal carrying control information to lower the temperature to a set temperature; a semiconductor cooling component capable of lowering the temperature of the first cold end to the set temperature according to the temperature regulation control signal, thereby increasing the temperature difference between the first hot end and the first cold end caused by human infrared radiation; the thermopile array infrared sensor further acquiring human infrared radiation signals within the detection range and outputting corresponding electrical signals after the temperature difference is increased by the semiconductor cooling component; and a signal processing and recognition unit for receiving the electrical signals, performing preprocessing, identifying human information through a preset human body recognition model, and outputting the recognition result.

[0007] The above technical solution, by adding a semiconductor cooling component and a temperature regulation control unit, can precisely control the cooling capacity of the semiconductor cooling component according to the actual ambient temperature and detection requirements, providing a stable and suitable cold junction temperature for the thermopile array infrared sensor, improving the reliability and stability of human body recognition, and effectively solving the influence of ambient temperature. The human body recognition system provided in this embodiment is highly adaptable and can adapt to various complex environmental conditions. Whether in a constant indoor temperature environment or under different seasons and climates, as long as the ambient temperature is close to the human body temperature, the temperature regulation function of the thermopile array infrared sensor can ensure the normal operation of the human infrared radiation acquisition function, improving the environmental adaptability of the human body recognition system. Furthermore, the human body recognition system provided in this embodiment has a relatively simple structure, and the modules are easy to integrate, making it convenient to install in various devices or scenarios requiring human body recognition, such as smart home systems, security monitoring equipment, and smart air conditioners, with good application and promotion prospects. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is an architecture diagram of a human body recognition system based on a thermopile array provided in one embodiment of the present invention; Figure 2 This is a schematic diagram showing the positional relationship of some components of a human body recognition system based on a thermopile array according to an embodiment of the present invention; Figure 3 This is a flowchart of a human body recognition method based on a thermopile array provided in one embodiment of the present invention. Detailed Implementation

[0010] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0011] Please refer to the following: Figures 1-2 ,in, Figure 1 This is an architecture diagram of a human body recognition system based on a thermopile array provided in one embodiment of the present invention; Figure 2 This is a schematic diagram showing the positional relationship of some components of a human body recognition system based on a thermopile array, provided in one embodiment of this utility model.

[0012] like Figure 1 As shown, the human body recognition system based on thermopile array described in this embodiment includes: a thermopile array infrared sensor 11, an ambient temperature sensor 12, a temperature regulation and control unit 13, a semiconductor cooling component 14, and a signal processing and recognition unit 15.

[0013] The thermopile array infrared sensor 11 has a functionally separated first hot end and a first cold end. The absorption region (hot junction region) of the thermopile array infrared sensor 11 converts infrared radiation into heat energy, raising its temperature and becoming the hot end of the thermopile array. Its reference region (cold junction region) has a relatively stable temperature, becoming the cold end of the thermopile array. An internal temperature difference is formed between the hot and cold ends, resulting in a potential difference. The thermopile array infrared sensor 11 can simultaneously measure infrared radiation signals from multiple points within its detection range and convert them into electrical signals. The ambient temperature sensor 12 is used to detect the current ambient temperature within the detection range in real time. The temperature regulation control unit 13 outputs a temperature regulation control signal when it determines that the difference between the current ambient temperature and the human body temperature is less than or equal to a preset threshold. The temperature regulation control signal carries control information to lower the temperature to a set temperature. The semiconductor cooling component 14 can lower the temperature of the first cold end to the set temperature according to the temperature regulation control signal, thereby increasing the temperature difference between the first hot end and the first cold end caused by human infrared radiation. The thermopile array infrared sensor 11, after its temperature difference is adjusted by the semiconductor cooling component 14, collects the infrared radiation signal of the human body within the detection range and outputs a corresponding electrical signal. The signal processing and recognition unit 15 receives the electrical signal, performs preprocessing, identifies the human body information through a preset human body recognition model, and outputs the recognition result.

[0014] By actively lowering the temperature of the first cold end of the thermopile array infrared sensor using a semiconductor cooling component, the temperature difference between the first hot end and the first cold end of the sensor caused by human infrared radiation is increased. This allows the thermopile array infrared sensor to accurately capture the difference in infrared radiation emitted by the human body even when the ambient temperature is close to the human body temperature. The human body recognition system provided in this embodiment significantly improves the accuracy of human body recognition, solves the pain point of traditional thermopile array human body recognition technology in this scenario, and effectively addresses the influence of ambient temperature. Furthermore, the human body recognition system provided in this embodiment is highly adaptable and can adapt to various complex environmental conditions. Whether in a constant indoor temperature environment or under different seasons and climates, as long as the ambient temperature is close to the human body temperature, the temperature regulation function of the thermopile array infrared sensor can ensure the normal operation of the human infrared radiation acquisition function through the semiconductor cooling component, thus improving the environmental adaptability of the human body recognition system.

[0015] In some embodiments, the thermopile array infrared sensor 11 employs a matrix structure or integrated chip composed of multiple MEMS thermopile units, enabling simultaneous measurement of human infrared radiation at multiple points within the detection range and conversion of the detected human infrared radiation signal into a pixel-level electrical signal. Each thermopile unit of the thermopile array infrared sensor 11 possesses high sensitivity and fast response characteristics, capable of accurately capturing subtle changes in infrared radiation. The thermopile array infrared sensor 11 can be fixed to the detection area of ​​the device to ensure it can fully receive infrared radiation signals from the surrounding environment.

[0016] The thermopile array infrared sensor 11 can also collect data before temperature difference adjustment: while the ambient temperature sensor 12 detects the current ambient temperature in real time and transmits the data to the temperature regulation control unit 13, the thermopile array infrared sensor 11 collects the initial infrared radiation signal within the detection range, converts it into an initial electrical signal, and then transmits it to the signal processing and recognition unit 15. However, when the current ambient temperature is close to the human body temperature, the initial electrical signal is difficult for the signal processing and recognition unit to accurately identify the human body.

[0017] like Figure 2 As shown, in some embodiments, the thermopile array infrared sensor 11 has a functionally separated first hot end (not shown) and a first cold end 111. All the first cold ends 111 of the thermopile array infrared sensor 11 are connected to the same substrate / reference heat dissipation area 110. The thermopile array infrared sensor 11 is based on the Seebeck effect. When the infrared radiation of the target object (e.g., a human body) passes through the infrared filter 112 and irradiates the absorption area (hot junction area) of the sensor, the absorption area converts the infrared radiation into heat energy, causing the temperature to rise, thus becoming the hot end of the thermopile array. The reference area (cold junction area) of the sensor has a relatively stable temperature, thus becoming the cold end of the thermopile array. The hot end and the cold end form an internal temperature difference, thereby generating a potential difference. Each pair of thermocouples generates a small thermoelectric potential due to the temperature difference. A large number of thermocouples are connected in series to accumulate and amplify these small voltages, ultimately outputting an electrical signal related to the temperature of the target object. Based on the output electrical signal, the intensity and temperature information of the infrared radiation can be inferred, thereby realizing the detection and identification of the human body. The hot-end and cold-end layout of thermopile arrays (such as 8x8 or 16x16 pixels) needs to balance "thermal isolation" (reducing heat loss from the hot end to the cold end to ensure temperature difference accuracy) and "array integration" (reducing sensor size). Specifically, all pixels in the array have their cold ends connected to the same substrate (or the same reference heat dissipation area), ensuring a uniform cold-end temperature that serves as the temperature reference for the entire array. The hot ends are independent "suspended heat islands" for each pixel, arranged according to array patterns (such as row and column distribution). The cold ends, as a common reference area, function in opposition to all the hot ends.

[0018] Please continue reading. Figure 2In this embodiment, the semiconductor cooling component 14 has a functionally separated second hot end 142 and a second cold end 141, with all the second cold ends 141 of the semiconductor cooling component 14 facing the substrate / reference heat dissipation area 110 of the thermopile array infrared sensor 11.

[0019] Please continue reading. Figure 2 In this embodiment, a thermally conductive material layer 210 is provided between the second cold end 141 of the semiconductor cooling component 14 and the substrate / reference heat dissipation area 110 to better reduce the temperature of the first cold end.

[0020] In some embodiments, the second cold end 141 of the semiconductor cooling component 14 is in contact with or has a gap from the substrate / reference heat dissipation area 110. The semiconductor cooling component 14 is installed near the cold end of the thermopile array infrared sensor 11, and the cold end of the semiconductor cooling component 14 and the cold end of the thermopile array infrared sensor 11 can be in close contact or maintain an appropriate distance to achieve optimal temperature difference regulation.

[0021] In some embodiments, the second hot end 142 of the semiconductor cooling component 14 is configured with a heat dissipation assembly (not shown). Optionally, the heat dissipation assembly includes a heat sink to improve heat dissipation efficiency and ensure stable operation of the semiconductor cooling component 14.

[0022] Please continue reading. Figure 2 In this embodiment, the semiconductor cooling component 14 includes multiple thermocouple pairs composed of N-type semiconductor material thermocouples 143 and P-type semiconductor material thermocouples 144, and operates via direct current. According to the Peltier effect, when current flows through the thermocouple pair composed of N-type semiconductor material thermocouples 143 and P-type semiconductor material thermocouples 144, one end absorbs heat and becomes the cold end, while the other end releases heat and becomes the hot end. By reasonably controlling the direction and magnitude of the operating current of the semiconductor cooling component 14, bringing its cold end closer to the thermopile array infrared sensor 11, the temperature of the first cold end can be adjusted, thereby increasing the temperature difference between the first hot end and the first cold end caused by human infrared radiation. Figure 2As shown, the N-type semiconductor material thermocouple 143 and the P-type semiconductor material thermocouple 144 of each thermocouple pair are connected to the same conductive electrode 145. By applying a working current to the conductive electrode 145 and controlling the magnitude and direction of the working current, the cooling intensity of the semiconductor cooling component 14 can be controlled, thereby reducing the cold junction of the thermopile array infrared sensor 11 to a set temperature. By adding the semiconductor cooling component 14 and the temperature regulation control unit 13, the cooling capacity of the semiconductor cooling component can be precisely controlled according to the actual ambient temperature and detection requirements, providing a stable and suitable cold junction temperature for the thermopile array infrared sensor 11, further improving the reliability and stability of human body recognition. The human body recognition system provided in this embodiment has a relatively simple structure, and the modules are easy to integrate, making it convenient to install in various devices or scenarios requiring human body recognition, such as smart home systems, security monitoring equipment, and smart air conditioners, with good application and promotion prospects.

[0023] The semiconductor cooling component 14 can be a hollow structure, and the pins 119 of the thermopile array infrared sensor 11 can be led out through the hollow part of the semiconductor cooling component 14.

[0024] Please refer to the following: Figures 1-2 In this embodiment, the temperature regulation control unit 13, when determining that the first difference between the current ambient temperature and the human body temperature is less than or equal to a preset threshold, obtains the magnitude and direction of the operating current required by the semiconductor cooling component 14 based on the second difference between the current ambient temperature and the set temperature, and generates the temperature regulation control signal. The temperature regulation control unit 13 may employ a microprocessor or other control chip and be equipped with corresponding temperature difference acquisition and control drive circuits.

[0025] In some embodiments, the preset threshold is the detection temperature difference limit of the thermopile array infrared sensor 11; the temperature difference between the set temperature and the human body temperature is greater than the detection temperature difference limit of the thermopile array infrared sensor 11. The human body temperature is the normal temperature of the human body under normal circumstances, specifically, the human body temperature range can be 35.5℃~37.5℃. The set temperature is calculated based on the difference between the current ambient temperature and the human body temperature, ensuring that the temperature difference between the human body temperature and the set temperature (the cold end temperature of the thermopile array infrared sensor 11 after temperature difference adjustment) is greater than the detection temperature difference limit of the thermopile array infrared sensor 11. The typical value of the detection temperature difference limit of the thermopile array infrared sensor 11 is 2℃; the temperature difference between the set temperature and the human body temperature can be greater than or equal to 10℃. The preset threshold range can be -5℃~5℃; for example, the preset threshold can be ±1℃, ±2℃, ±3℃, ±4℃, ±5℃. To save system energy, the preset threshold range can be set to -3℃ to 3℃. For example, the preset threshold can be set to 2℃; then, when the first difference between the current ambient temperature and the human body temperature is less than or equal to 2℃, the temperature regulation control unit 13 starts the temperature regulation program.

[0026] In some embodiments, the temperature regulation control unit 13 can calculate the first difference using a preset algorithm, which includes, but is not limited to, a constant current control algorithm and a PID (proportional-integral-derivative) control algorithm.

[0027] In some embodiments, the preprocessing performed by the signal processing and recognition unit 15 on the received electrical signal includes signal amplification, filtering, and analog-to-digital conversion. The human body recognition model is based on deep learning or pattern recognition algorithms to recognize human information. The human body information includes at least one of the following: number of people, human body position, human body posture, and human body gesture. The signal processing and recognition unit 15 may include signal amplifiers, filters, analog-to-digital converters, and microcontrollers or digital signal processors for running the corresponding algorithms of the human body recognition model.

[0028] Based on the same inventive concept, this utility model also provides a human body recognition method based on thermopile array. The above-mentioned human body recognition system based on thermopile array of this utility model can be used to effectively solve the problem of accurately capturing human infrared radiation by thermopile array infrared sensors when the ambient temperature is close to the human body temperature, and greatly improve the accuracy of human body recognition.

[0029] Please refer to the following: Figures 1-3 ,in, Figure 3 This is a flowchart of a human body recognition method based on a thermopile array provided in one embodiment of the present invention.

[0030] like Figure 3 As shown, the human body recognition method based on thermopile array described in this embodiment includes the following steps: S1, Ambient temperature acquisition: The ambient temperature sensor is used to detect the current ambient temperature within the detection range of the thermopile array infrared sensor in real time; S2, Temperature judgment and control: The temperature regulation control unit outputs a temperature regulation control signal when it determines that the first difference between the current ambient temperature and the human body temperature is less than or equal to a preset threshold. The temperature regulation control signal carries control information to reduce the temperature to a set temperature; S3, Temperature regulation: The semiconductor cooling component is used to reduce the temperature of the first cold end to the set temperature according to the temperature regulation control signal, so as to increase the temperature difference between the temperature of the first hot end and the temperature of the first cold end caused by human infrared radiation; S4, Signal acquisition: After the temperature difference is adjusted by the semiconductor cooling component, the thermopile array infrared sensor is used to acquire the human infrared radiation signal within the detection range and output the corresponding electrical signal; and S5, Human body recognition: The signal processing and recognition unit receives the electrical signal and performs preprocessing, then identifies human body information through a preset human body recognition model and outputs the recognition result.

[0031] Regarding step S1, ambient temperature acquisition: The ambient temperature sensor is used to detect the current ambient temperature within the detection range of the thermopile array infrared sensor in real time. The target object includes a human body or other objects. The thermopile array infrared sensor 11 can also acquire data before temperature difference adjustment: While the ambient temperature sensor 12 detects the current ambient temperature in real time and transmits the data to the temperature regulation control unit 13, the thermopile array infrared sensor 11 acquires the initial infrared radiation signal within its detection range, converts it into an initial electrical signal, and transmits it to the signal processing and recognition unit 15. However, when the current ambient temperature is close to the human body temperature, the initial electrical signal may be difficult for the signal processing and recognition unit to accurately identify the human body.

[0032] Regarding step S2, temperature judgment and control: When the temperature regulation and control unit determines that the first difference between the current ambient temperature and the human body temperature is less than or equal to a preset threshold, it outputs a temperature regulation and control signal. The temperature regulation and control signal carries control information to reduce the temperature to the set temperature.

[0033] In some embodiments, the temperature judgment and control step specifically includes: (21) using the temperature regulation control unit to determine whether the first difference between the current ambient temperature and the human body temperature is less than or equal to a preset threshold; (22) if it is determined that the first difference between the current ambient temperature and the human body temperature is less than or equal to the preset threshold, then obtaining the magnitude and direction of the operating current required by the semiconductor cooling component based on the second difference between the current ambient temperature and the set temperature, and generating the temperature regulation control signal. The temperature regulation control unit 13 may use a microprocessor or other control chip, and is equipped with a corresponding temperature difference acquisition and control drive circuit.

[0034] In this embodiment, the thermopile array infrared sensor 11 has a functionally separated first hot end and first cold end 111; and the semiconductor cooling component 14 includes multiple thermocouple pairs composed of N-type semiconductor material thermocouples 143 and P-type semiconductor material thermocouples 144, which are driven by direct current. When current passes through the thermocouple pair composed of N-type semiconductor material thermocouples 143 and P-type semiconductor material thermocouples 144, one end absorbs heat and becomes the cold end, while the other end releases heat and becomes the hot end. By reasonably controlling the direction and magnitude of the operating current of the semiconductor cooling component 14, so that its cold end is close to the first cold end 111 of the thermopile array infrared sensor 11, the temperature of the first cold end can be adjusted, thereby increasing the temperature difference between the first hot end and the first cold end caused by human infrared radiation.

[0035] In some embodiments, the preset threshold is the detection temperature difference limit of the thermopile array infrared sensor 11; the temperature difference between the set temperature and the human body temperature is greater than the detection temperature difference limit of the thermopile array infrared sensor 11. The human body temperature is the normal temperature of the human body under normal circumstances, specifically, the human body temperature range can be 35.5℃~37.5℃. The set temperature is calculated based on the difference between the current ambient temperature and the human body temperature, ensuring that the temperature difference between the first hot end and the first cold end caused by human infrared radiation is greater than the detection temperature difference limit of the thermopile array infrared sensor 11. The typical detection temperature difference limit of the thermopile array infrared sensor 11 is 2℃; the temperature difference between the set temperature and the human body temperature can be greater than or equal to 10℃. The preset threshold range can be -5℃~5℃; for example, the preset threshold can be ±1℃, ±2℃, ±3℃, ±4℃, ±5℃. To save system energy consumption, the preset threshold range can be set to -3℃~3℃. For example, the preset threshold can be set to 2℃; then, when the first difference between the current ambient temperature and the human body temperature is less than or equal to 2℃, the temperature regulation control unit 13 starts the temperature regulation program.

[0036] In some embodiments, the temperature regulation control unit 13 can calculate the first difference using a preset algorithm, which includes, but is not limited to, a constant current control algorithm and a PID (proportional-integral-derivative) control algorithm.

[0037] In some embodiments, the preprocessing performed by the signal processing and recognition unit 15 on the received electrical signal includes signal amplification, filtering, and analog-to-digital conversion. The human body recognition model is based on deep learning or pattern recognition algorithms to recognize human information. The human body information includes at least one of the following: number of people, human body position, human body posture, and human body gestures.

[0038] The present invention will be further explained and described below with reference to the embodiments.

[0039] (a) System Assembly (1) Fix the thermopile array infrared sensor to the detection part of the equipment to ensure that it can fully receive the infrared radiation signal from the surrounding environment. (2) Install the semiconductor cooling component, so that the cold end of the semiconductor cooling component is in close contact with the thermopile array infrared sensor or maintains an appropriate distance to achieve the best temperature difference regulation effect. (3) Connect the temperature regulation control unit and the semiconductor cooling component to ensure that the electrical signal transmission between the two is normal; at the same time, connect the ambient temperature sensor to the temperature regulation control unit for real-time feedback of ambient temperature information. (4) Connect the signal processing and recognition unit to the thermopile array infrared sensor.

[0040] (II) Example of work process Assume an indoor environment where the ambient temperature sensor detects a current temperature of 35°C, close to human body temperature (the initial difference between the current ambient temperature and human body temperature is less than 2°C). Because the ambient temperature is close to human body temperature, the signal processing and recognition unit cannot accurately identify a human based on the initial electrical signal received from the thermopile array infrared sensor. The temperature regulation control unit receives the current ambient temperature from the sensor and, after internal calculations, determines that temperature difference adjustment is needed. The control unit sends a temperature regulation control signal to the thermoelectric cooling component. This signal carries control information to lower the temperature to a set temperature, adjusting the magnitude and direction of the current in the thermoelectric cooling component so that its cold junction faces the cold junction of the thermopile array infrared sensor and begins cooling with a corresponding cooling intensity, thereby lowering the cold junction temperature of the thermopile array infrared sensor to the set temperature (e.g., 25°C). After the thermoelectric cooling component cools and lowers the cold junction temperature of the thermopile array infrared sensor to the set temperature, the thermopile array infrared sensor again collects infrared radiation signals within its detection range. At this point, due to the increased temperature difference (greater than 10°C) between the hot and cold ends of the thermopile array infrared sensor caused by human infrared radiation, the human features in the electrical signal output by the thermopile array infrared sensor become more prominent. The signal processing and recognition unit amplifies, filters, and performs analog-to-digital conversion on the received electrical signal, then inputs the processed signal into a preset human recognition model. By analyzing the distribution of infrared radiation intensity and temperature variation patterns in the signal, the model accurately identifies the human's position, posture, gestures, and other information, and outputs the recognition result, completing the human recognition process.

[0041] The above embodiments of this utility model, by adding a semiconductor cooling component and a temperature regulation control unit, can precisely control the cooling capacity of the semiconductor cooling component according to the actual ambient temperature and detection requirements, providing a stable and suitable cold junction temperature for the thermopile array infrared sensor, improving the reliability and stability of human body recognition, and effectively solving the problem of environmental temperature influence. The human body recognition system provided by this embodiment is highly adaptable and can adapt to various complex environmental conditions. Whether in a constant indoor temperature environment or under different seasons and climates, as long as the ambient temperature is close to the human body temperature, the temperature regulation function of the thermopile array infrared sensor can ensure the normal operation of the human infrared radiation collection function, improving the environmental adaptability of the human body recognition system. Furthermore, the human body recognition system provided by this embodiment has a relatively simple structure, and the modules are easy to integrate, making it convenient to install in various devices or scenarios requiring human body recognition, such as smart home systems, security monitoring equipment, and smart air conditioners, with good application and promotion prospects.

[0042] It should be noted that in the above embodiments, each embodiment focuses on the differences from other embodiments, and the same / similar parts between the embodiments can be referred to each other.

[0043] The terms "comprising" and "having," and variations thereof, used in this document are intended to cover non-exclusive inclusion. The terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence, unless explicitly indicated by the context; such use of terms should be understood to be interchangeable where appropriate. The term "one or more," at least in part depending on the context, can be used to describe features, structures, or characteristics in a singular sense, or in a plural sense, to describe combinations of features, structures, or characteristics. The term "based on" can be understood as not necessarily intended to express an exclusive set of factors, but can instead, at least in part depending on the context, allow for the presence of other factors that are not necessarily explicitly described. Furthermore, embodiments and features within embodiments of this invention can be combined with each other without conflict. In addition, descriptions of well-known components and technologies have been omitted in the above description to avoid unnecessarily obscuring the concepts of this invention.

[0044] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A human body recognition system based on a thermopile array, characterized in that, include: A thermopile array infrared sensor, wherein the thermopile array infrared sensor has a functionally separated first hot end and a first cold end, and the thermopile array infrared sensor can simultaneously measure infrared radiation signals at multiple points within the detection range and convert them into electrical signals; An ambient temperature sensor is used to detect the current ambient temperature within the detection range in real time. A temperature regulation control unit is used to output a temperature regulation control signal when it is determined that the first difference between the current ambient temperature and the human body temperature is less than or equal to a preset threshold. The temperature regulation control signal carries control information to reduce the temperature to a set temperature. The semiconductor cooling component can reduce the temperature of the first cold end to the set temperature according to the temperature adjustment control signal, so as to increase the temperature difference between the first hot end and the first cold end caused by human infrared radiation; the thermopile array infrared sensor further collects the human infrared radiation signal within the detection range and outputs the corresponding electrical signal after the temperature difference is increased by the semiconductor cooling component. And a signal processing and recognition unit, used to receive the electrical signal and preprocess it, then identify human information through a preset human body recognition model and output the recognition result.

2. The system according to claim 1, characterized in that, The thermopile array infrared sensor uses a matrix structure or integrated chip composed of multiple MEMS thermopile units, which can simultaneously measure human infrared radiation at multiple points within the detection range and convert the detected human infrared radiation signal into a pixel-level electrical signal.

3. The system according to claim 1, characterized in that, All the first cold ends of the thermopile array infrared sensor are connected to the same substrate / reference heat dissipation area; the semiconductor cooling component has functionally separated second hot ends and second cold ends, and all the second cold ends of the semiconductor cooling component face the substrate / reference heat dissipation area.

4. The system according to claim 3, characterized in that, A thermally conductive material layer is disposed between the second cold end of the semiconductor cooling component and the substrate / reference heat dissipation area.

5. The system according to claim 3, characterized in that, The second hot end of the semiconductor cooling component is equipped with a heat dissipation assembly.

6. The system according to claim 5, characterized in that, The heat dissipation component uses heat sinks.

7. The system according to claim 3, characterized in that, The second cold end of the semiconductor cooling component is attached to or has a gap with the substrate / reference heat dissipation area.

8. The system according to claim 3, characterized in that, The semiconductor cooling component includes multiple pairs of thermocouples composed of N-type semiconductor material thermocouples and P-type semiconductor material thermocouples, and operates by direct current driving.

9. The system according to claim 1 or 8, characterized in that, When the temperature regulation control unit determines that the first difference between the current ambient temperature and the human body temperature is less than or equal to a preset threshold, it can obtain the magnitude and direction of the operating current required by the semiconductor cooling component based on the second difference between the current ambient temperature and the set temperature, and generate the temperature regulation control signal.

10. The system according to claim 1, characterized in that, The preset threshold is the detection temperature difference limit of the thermopile array infrared sensor; the temperature difference between the set temperature and the human body temperature is greater than the detection temperature difference limit of the thermopile array infrared sensor.

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