A temperature measurement system and method based on image recognition

Abstract

The invention discloses a temperature measurement system and method based on image recognition, the system comprises a passive temperature indicating device and an image processing device; the passive temperature indicating device comprises a temperature difference power generation module, an energy storage module and an indicator light module; the temperature difference power generation module supplies power to the energy storage module based on the thermoelectric effect when the temperature of the object under test changes, so as to stimulate the indicator light module to emit light and flash; the image processing device is used to collect a video image of the indicator light module, analyze the video image, identify the luminous and flashing area in the video image, and calculate the frequency of the luminous and flashing of the indicator light module, and calculate the temperature change value of the surface of the object under test according to the frequency of the luminous and flashing of the indicator light module; the system identifies the flashing area of ​​the indicator light module through the image processing device, and further calculates the temperature change value through the frequency of the luminous and flashing, the image recognition algorithm is simple, and the production cost is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of image processing, and in particular to a temperature measurement system and method based on image recognition. Background Art

[0002] Temperature detection of equipment is a common function that can be achieved in a variety of ways. The most common way is to set up a temperature sensor to collect the surface temperature signal of the object being measured and analyze it to obtain the temperature value. However, this existing technology is easily affected by environmental factors and is not suitable for application scenarios of electronic instruments and equipment such as high altitude, high pressure, and strong magnetic field.

[0003] Therefore, infrared thermal imaging technology is widely used in various devices that are inconvenient to measure temperature directly through temperature sensors. For example, patent document CN113902641A discloses a data center hot zone identification method and system based on infrared images. This technology is applied to blade servers, specifically including: converting the original RGB color image into a grayscale image, and then using the CLAHE adaptive histogram equalization method to optimize the grayscale image; using an adaptive infrared image detail enhancement method based on guided filtering to enhance the contrast of the optimized grayscale image; using a connected domain method, using the contrast-enhanced image to identify the rectangular area of ​​the blade server, reading the grayscale value of the grayscale image for temperature mapping, calculating the average temperature and the local maximum temperature of each blade server, determining the working status of each blade server, and feeding back the average temperature and the local maximum temperature for load balancing to achieve data center hot zone identification.

[0004] It can be seen that the use of infrared thermal imaging technology requires complex calculations on images and the configuration of high-power data processors, which is costly and has complex algorithms. In addition, the accuracy of its temperature detection is greatly affected by the quality of the captured images. Summary of the invention

[0005] The present invention provides a temperature measurement system and method based on image recognition. Only simple image recognition is required in combination with a corresponding temperature indicating device to quantitatively calculate the specific value of temperature change. The algorithm is simple, the system has strong stability, and the production cost is effectively reduced.

[0006] A temperature measurement system based on image recognition, comprising a passive temperature indicating device arranged on the surface of the object to be measured and an image processing device arranged at a remote end;

[0007] The passive temperature indicating device comprises a temperature difference power generation module, an energy storage module and an indicator light module; the temperature difference power generation module supplies power to the energy storage module based on the thermoelectric effect when the temperature of the object under test changes, so as to stimulate the indicator light module to emit light and flash;

[0008] The image processing device is used to collect the video image of the indicator light module, analyze the video image, identify the luminous and flashing area in the video image, and calculate the frequency of the luminous and flashing of the indicator light module, and calculate the temperature change value of the surface of the object under test according to the frequency of the luminous and flashing of the indicator light module.

[0009] Furthermore, the temperature difference power generation module includes a thermoelectric device, a heat dissipation part, a first heat conducting part and a second heat conducting part, the first heat conducting part is arranged between the hot end of the thermoelectric device and the surface of the object to be measured, and the second heat conducting part is arranged between the cold end of the hot end device and the heat dissipation part; the thermoelectric device is made of bismuth telluride material.

[0010] Furthermore, after the image processing device identifies the luminous flickering area in the video image, the luminous flickering frequency is calculated based on the number of times the luminous flickering area lights up and goes out within a preset time period.

[0011] Furthermore, the passive temperature indicating device also includes an insulating shell.

[0012] Furthermore, the passive temperature indicating device also includes a protection module;

[0013] The protection module includes a fuse, a varistor, a first resistor and a diode, the cathode of the diode is connected to one end of the first resistor, the other end of the first resistor and the anode of the diode are respectively connected to the two ends of the varistor, one end of the varistor is connected to the negative electrode of the thermoelectric device and the anode of the diode, and the other end is connected to one end of the fuse, and the other end of the fuse is connected to the positive electrode of the thermoelectric device.

[0014] Furthermore, the energy storage module includes a high-voltage capacitor, and the high-voltage capacitor is connected in parallel with the diode.

[0015] Furthermore, the indicator light module includes a second resistor and a glow discharge lamp, and the second resistor is connected in series with the glow discharge lamp and then connected in parallel with the high-voltage capacitor.

[0016] Furthermore, a light-transmitting element is arranged outside the indicator light module.

[0017] Furthermore, the temperature change of the object under test is calculated by the following formula:

[0018] ;

[0019] Among them, R is the resistance value of the first resistor, C is the capacitance value of the high-voltage capacitor, K is the temperature change value, f is the frequency of the indicator light module flashing, E is the starting voltage of the glow discharge lamp, and ρ is the Seebeck coefficient of the material used in the electric heating device.

[0020] A temperature measurement method using the above system comprises:

[0021] Collecting a video image of the indicator light module by the image processing device;

[0022] Analyze the video image, identify the light-emitting and flashing area in the video image, and calculate the light-emitting and flashing frequency of the indicator light module;

[0023] According to the frequency of the indicator light module flashing, the temperature change value of the surface of the object being measured is calculated.

[0024] The temperature measurement system and method based on image recognition provided by the present invention have at least the following beneficial effects:

[0025] (1) The flashing area of ​​the indicator light module is identified by an image processing device, and the temperature change value is further calculated by the frequency of the flashing light. The image recognition algorithm is simple, effectively reduces production costs, and has high reliability.

[0026] (2) A passive temperature indicator device is set on the surface of the object to be measured, so that the indicator light flashes when the temperature of the object to be measured rises, and the flashing frequency is analyzed by an image processing device set at a remote end to obtain the temperature change value. Without the need for additional power supply, the quantitative detection of the temperature change of the object to be measured is completed. The application scenarios of the system are more extensive, and the temperature detection results are more accurate.

[0027] (3) A glow discharge lamp is used for temperature indication. The temperature change value is indicated based on the fact that the flashing frequency of the glow discharge lamp is positively correlated with the temperature change value. This not only realizes the function of indicating whether the temperature has changed, but also realizes the function of indicating the magnitude of the temperature change.

[0028] (4) Bismuth telluride thermoelectric material is used to power the energy storage module, and high-voltage capacitors are used for energy storage and charging and discharging. Based on the relationship between the voltage change and temperature of the bismuth telluride material, the relationship between the charging and discharging time of the capacitor and the voltage change, and the characteristic that the glow discharge lamp has a starting voltage, the temperature change value of the object under test can be quantitatively calculated, and the temperature detection result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of an embodiment of a temperature measurement system based on image recognition provided by the present invention.

[0030] Figure 2 The present invention provides a schematic structural diagram of an embodiment of a passive temperature indicating device in a temperature measurement system based on image recognition.

[0031] Figure 3A schematic structural diagram of another embodiment of a passive temperature indicating device in a temperature measurement system based on image recognition provided by the present invention.

[0032] Figure 4 A circuit diagram of an embodiment of a passive temperature indicating device in a temperature measurement system based on image recognition provided by the present invention.

[0033] Figure 5 This is a schematic diagram of the influence of the capacitance value and the first resistance value on the temperature change curve in the temperature measurement system based on image recognition provided by the present invention.

[0034] Figure 6 A structural schematic diagram of an embodiment of an image processing device in a temperature measurement system based on image recognition provided by the present invention.

[0035] Figure 7 The present invention provides a flow chart of an embodiment of a temperature measurement method based on image recognition.

[0036] Reference numerals: 1-passive temperature indicating device, 11-temperature difference power generation module, 111-thermoelectric device, 112-heat dissipation part, 113-first heat conduction part, 114-second heat conduction part, 12-energy storage module, 13-indicator light module, 14-protection module, 15-light-transmitting element, 16-insulating housing, F 1 - Fuse, R 1 - First resistor, R 2 - Second resistor, RV 1 - Varistor, C 1 - High voltage capacitor, D 1 -Diode, D 2 -glow discharge lamp, 2-image processing device, 21-camera, 22-processor. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0039] refer to Figure 1In some embodiments, a temperature measurement system based on image recognition is provided, including a passive temperature indicating device 1 arranged on the surface of the object to be measured and an image processing device 2 arranged at a remote end; the passive temperature indicating device 1 includes a temperature difference power generation module 11, an energy storage module 12 and an indicator light module 13; the temperature difference power generation module 11 supplies power to the energy storage module 12 based on the thermoelectric effect when the temperature of the object to be measured changes, so as to stimulate the indicator light module 13 to emit light and flash; the image processing device 2 is used to collect a video image of the indicator light module 13, and analyze the video image to obtain the frequency of the indicator light module 13 emitting light and flashing, and calculate the temperature change value of the surface of the object to be measured according to the frequency of the indicator light module 13 emitting light and flashing.

[0040] The flashing area of ​​the indicator light module 13 is identified by the image processing device 2, and the temperature change value is further calculated according to the flashing frequency. The image recognition algorithm is simple, effectively reduces the production cost, and has high reliability.

[0041] The image processing device 2 is arranged at a far end away from the object to be measured, and only the passive temperature indicating device 1 without power supply needs to be arranged on the surface of the object to be measured, while the electronic equipment for image acquisition and analysis can be arranged far away from the object to be measured. Therefore, the system can be applied to working scenes where the use of electronic instruments and equipment is restricted, such as high altitude, high voltage, strong magnetic field, etc., and the working scenes are applicable to a wider range.

[0042] Furthermore, after the image processing device 2 identifies the luminous flickering area in the video image, it calculates the frequency of the luminous flickering according to the number of times the luminous flickering area lights up and goes out within a preset time period.

[0043] Specifically, the image processing device 2 extracts features from the video image, inputs the features into the classifier for classification and outputs the classification results. Under a simple image background, the luminous flickering area has obvious features in the image. For example, in a frame of luminous image, the luminous flickering area appears as an obvious bright spot, and in a frame of non-luminous image, the luminous flickering area appears dim. Therefore, the luminous flickering area can be identified without a complex algorithm. After the luminous flickering area is identified, the frequency of the luminous flickering can be calculated by calculating the number of times it lights up and goes off within a preset time length, or by calculating the interval time between the light and dark of the luminous flickering area.

[0044] Since the surface temperature of the object being measured may change in real time, the temperature change value within a period of time can be calculated by calculating the frequency of light flashing within the period of time.

[0045] Specifically, refer to Figure 2The temperature difference power generation module 11 includes a thermoelectric device 111, a heat dissipation part 112, a first heat conducting part 113 and a second heat conducting part 114. The first heat conducting part 113 is arranged between the hot end of the thermoelectric device 111 and the surface of the object to be measured, and the second heat conducting part 114 is arranged between the cold end of the hot device and the heat dissipation part 112. The first heat conducting part 113 and the second heat conducting part 114 make the contact surface more closely fitted, so as to obtain low thermal resistance and high heat transfer; the heat dissipation part 112 is used to increase the contact area between the cold end of the thermoelectric device 111 and the air, so that the temperature of the cold end of the thermoelectric device 111 is closer to the room temperature, and a better temperature detection effect is achieved.

[0046] As a preferred embodiment, the thermoelectric device 111 is made of bismuth telluride material. Bismuth telluride material has the Seebeck effect. When the temperature of the hot end of the thermoelectric device 111 contacting the object to be measured is higher than the cold end contacting the air through the heat sink, a thermal current is generated in the circuit flowing from the hot end to the cold end, and a thermoelectric potential is generated, realizing the power supply function of the temperature difference power generation module 11 to the energy storage module 12.

[0047] The Seebeck effect, also known as the first thermoelectric effect, refers to the thermoelectric phenomenon that the voltage difference between two substances is caused by the temperature difference between two different electrical conductors or semiconductors. The direction of the thermoelectric potential is generally defined as: electrons flow from negative to positive at the hot end.

[0048] In a circuit composed of two metals A and B, if the temperatures of the two contact points are different, a current will appear in the circuit, which is called thermal current. The corresponding electromotive force is called thermoelectric potential, and its direction depends on the direction of the temperature gradient.

[0049] The cause of the Seebeck effect can be simply explained as the carriers in the conductor move from the hot end to the cold end under the temperature gradient and accumulate at the cold end, thus forming a potential difference inside the material. At the same time, a reverse charge flow is generated under the action of the potential difference. When the charge flow of thermal motion reaches a dynamic equilibrium with the internal electric field, a stable thermoelectric potential is formed at both ends of the semiconductor. The thermoelectric potential of semiconductors is large and can be used as thermoelectric generators.

[0050] In some embodiments, the thermoelectric device 111 includes a P / N type bismuth telluride-based element made of bismuth telluride material, a cold end electrode, a hot end electrode, a ceramic substrate and other components. The cold end electrode and the hot end electrode are sintered on the ceramic substrate, and the bismuth telluride-based element, the cold end electrode, and the hot end electrode constitute a conductive series thermoelectric heating device.

[0051] As a preferred implementation, the passive temperature indicating device 1 further includes an insulating shell 16 .

[0052] As a preferred implementation method, refer to Figure 3The passive temperature indicating device 1 further includes a protection module 14 , which is used to limit the maximum voltage and maximum current of the electrical signal input to the energy storage module 12 .

[0053] As a preferred implementation, a light-transmitting element 15 is disposed outside the indicator light module 13 .

[0054] refer to Figure 4 The protection module 14 includes a fuse F 1 , Varistor RV 1 , the first resistor R 1 And diode D 1 , the diode D 1 The cathode and the first resistor R 1 One end of the first resistor R 1 The other end of the diode D 1 The anode of the varistor RV 1 The two ends of the varistor RV are connected 1 One end of the thermoelectric device 111 and the cathode of the diode D 1 The anode is connected to the fuse F 1 One end of the fuse F 1 The other end is connected to the positive electrode of the thermoelectric device 111.

[0055] Among them, the varistor RV 1 To limit the maximum voltage within a safe range, fuse F 1 To limit the maximum current within a safe range, the diode D 1 Used to prevent reverse voltage.

[0056] The energy storage module 12 includes a high voltage capacitor C 1 , the high voltage capacitor C 1 With the diode D 1 In parallel. High voltage capacitor C 1 It can also be replaced by high-voltage supercapacitors to store electrical energy.

[0057] The indicator light module 13 includes a second resistor R 2 and glow discharge lamp D 2 , the second resistor R 2 With the glow discharge lamp D 2 After being connected in series with the high voltage capacitor C 1 In parallel, the second resistor R 2 Used for current limiting. Glow discharge lamp D 2It has a starting voltage. When the voltage applied between the two electrodes is lower than the starting voltage, the medium will not be ionized and the current will not flow through the lamp tube. When the voltage applied between the two electrodes is greater than the starting voltage, the medium will be ionized, the current will flow through the lamp tube and make the glow discharge lamp D 2 emits a glow, thereby achieving the excitation glow discharge lamp D 2 The greater the current generated by the thermoelectric device 111, the higher the voltage of the high-voltage capacitor C 1 The faster the charge, the brighter the glow discharge lamp D 2 The more frequent the flashes, the more likely it is to detect temperature changes in the object being measured.

[0058] When the temperature of the hot end of the thermoelectric device is higher than that of the cold end, a thermal current flows from the positive electrode of the thermoelectric device 111 to the high-voltage capacitor C 1 Charge and the high voltage capacitor C 1 The potential gradually accumulates at both ends. When the high voltage capacitor C 1 The potential difference between the positive and negative electrodes is higher than that of a glow discharge lamp D 2 When the starting voltage of the glow discharge lamp D 2 Starts to glow until the high voltage capacitor C 1 The stored energy in the glow discharge lamp D is completely consumed. 2 Off, high voltage capacitor C 1 Restart charging.

[0059] In some embodiments, the glow discharge lamp D can be visually observed. 2 The flashing frequency can be used to determine how fast the surface temperature of the object being measured changes.

[0060] In some embodiments, the image of the glow discharge lamp D can also be collected by the image processing device 2 disposed at the remote end. 2 The flickering image is analyzed to obtain the flickering frequency, and the temperature change value of the object under test is further calculated based on the flickering frequency.

[0061] It should be noted that the high-voltage capacitor charging time is calculated by the following formula:

[0062] ;

[0063] Among them, U t is the voltage value across the high-voltage capacitor after charging time t, U e is the voltage generated by the thermoelectric device, U 0 is the starting voltage value, R is the resistance value of the first resistor, C is the capacitance value of the high voltage capacitor, and t is the charging time.

[0064] In the system provided in this embodiment, the charging power supply voltage is related to the Seebeck coefficient ρ of the thermoelectric device 111 and the temperature change value K between the hot end and the cold end of the thermoelectric device 111. Therefore, in this embodiment, the high-voltage capacitor charging time is calculated by the following formula:

[0065] U e =ρK;

[0066] U t =E;

[0067] ;

[0068] Wherein, R is the resistance value of the first resistor, C is the capacitance value of the high-voltage capacitor, K is the temperature change value, t is the charging time, E is the starting voltage of the glow discharge lamp, and ρ is the Seebeck coefficient of the material used in the electric heating device.

[0069] Therefore, the temperature change of the object being measured is calculated by the following formula:

[0070] ;

[0071] Among them, R is the resistance value of the first resistor, C is the capacitance value of the high-voltage capacitor, K is the temperature change value, f is the frequency of the indicator light module flashing, E is the starting voltage of the glow discharge lamp, and ρ is the Seebeck coefficient of the material used in the electric heating device.

[0072] As a preferred implementation, the first resistor R 1 The resistance value and high voltage capacitor C 1 The capacitance value will be D 2 The flashing frequency is controlled within a range that meets on-site needs. Figure 5 The figure shows the influence of the resistance value R of the first resistor and the capacitance value C of the high-voltage capacitor on the temperature change-frequency curve. The three curves in the figure represent the influence of the functional relationship curve of temperature change K and frequency f when the value of RC changes from small to large from left to right.

[0073] refer to Figure 6 In some embodiments, the image processing device 2 includes a camera 21 and a processor 22. The camera 21 is used to collect the image of the glow discharge lamp D 2 The image is sent to the processor 22, and the processor 22 analyzes the image to obtain the flicker frequency. For example, the processor 22 identifies the glow discharge lamp for each frame of the image, identifies the glow discharge lamp on and off, and calculates the number of times the glow discharge lamp lights up and goes out in a unit time. The flicker frequency of the glow discharge, etc. can be calculated.

[0074] The system provided by the above embodiment identifies the flashing area of ​​the indicator light module 13 through the image processing device 2, and further calculates the temperature change value through the frequency of the light flashing. The image recognition algorithm is simple, effectively reduces the production cost, and has high reliability. The passive temperature indicating device 1 is arranged on the surface of the object to be measured, so that the indicator light flashes when the temperature of the object to be measured rises, and the image processing device 2 arranged at the remote end analyzes the flashing frequency to obtain the temperature change value. Without the need to set up an additional power supply, the quantitative detection of the temperature change of the object to be measured is completed. The application scenarios of the system are more extensive, and the temperature detection results are more accurate. A glow discharge lamp is used for temperature indication. Based on the positive correlation between the flashing frequency of the glow discharge lamp and the temperature change value, the temperature change value is indicated, which not only realizes the indication function of whether the temperature changes or not, but also realizes the function of indicating the temperature change amplitude. Bismuth telluride thermoelectric material is used to power the energy storage module 12, and a high-voltage capacitor is used for energy storage and charging and discharging. Based on the relationship between the voltage change and temperature of the bismuth telluride material, the relationship between the capacitor charging and discharging time and the voltage change, and the characteristic that the glow discharge lamp has a starting voltage, the temperature change value of the object to be measured can be quantitatively calculated, and the temperature detection result is more accurate.

[0075] refer to Figure 7 In some embodiments, a temperature measurement method using the above system is provided, comprising:

[0076] S1, collecting a video image of the indicator light module by the image processing device;

[0077] S2, analyzing the video image, identifying the light-emitting and flashing area in the video image, and calculating and obtaining the light-emitting and flashing frequency of the indicator light module;

[0078] S3. Calculate the temperature change value of the surface of the object to be measured according to the frequency of the light flashing of the indicator light module.

[0079] Specifically, in step S1, the image processing device 2 is arranged at a remote end where the flashing of the indicator light module 13 can be captured. When the temperature of the object under test changes, the thermoelectric device 111 in the temperature difference power generation module 11 supplies power to the energy storage module 12, thereby stimulating the glow discharge lamp in the indicator light module 13 to flash. The video image obtained by the image processing device 2 contains the flashing information of the glow discharge lamp in the indicator light module 13, and the temperature change value of the surface of the object under test can be obtained after analysis and calculation.

[0080] In step S2, after the image processing device 2 identifies the luminous flickering area in the video image, it calculates the frequency of the luminous flickering according to the number of times the luminous flickering area lights up and goes out within a preset time period.

[0081] Specifically, the image processing device 2 extracts features from the video image, inputs the features into the classifier for classification and outputs the classification results. Under a simple image background, the luminous flickering area has obvious features in the image. For example, in a frame of luminous image, the luminous flickering area appears as an obvious bright spot, and in a frame of non-luminous image, the luminous flickering area appears dim. Therefore, the luminous flickering area can be identified without a complex algorithm. After the luminous flickering area is identified, the frequency of the luminous flickering can be calculated by calculating the number of times it lights up and goes off within a preset time length, or by calculating the interval time between the light and dark of the luminous flickering area.

[0082] In step S3, based on the time information and image information contained in the video, the time when the temperature change occurs can be obtained, and corresponding to the time when the flicker occurs, the specific time and change value of the temperature change can be obtained.

[0083] In step S3, the temperature change of the object to be measured is calculated by the following formula:

[0084] ;

[0085] Among them, R is the resistance value of the first resistor, C is the capacitance value of the high-voltage capacitor, K is the temperature change value, f is the frequency of the indicator light module flashing, E is the starting voltage of the glow discharge lamp, and ρ is the Seebeck coefficient of the material used in the electric heating device.

[0086] The method provided in the above embodiment uses the image processing device 2 to identify the flashing area of ​​the indicator light module, and further calculates the temperature change value through the frequency of the light flashing. The image recognition algorithm is simple, effectively reduces the production cost, and has high reliability. The passive temperature indicating device 1 is arranged on the surface of the object to be measured, so that the indicator light flashes when the temperature of the object to be measured rises, and the image processing device 2 arranged at the remote end analyzes the flashing frequency to obtain the temperature change value. Without the need to set up an additional power supply, the quantitative detection of the temperature change of the object to be measured is completed. The application scenarios of the system are more extensive, and the temperature detection results are more accurate. A glow discharge lamp is used for temperature indication. Based on the characteristic that the flashing frequency of the glow discharge lamp is positively correlated with the temperature change value, the temperature change value is indicated, which not only realizes the indication function of whether the temperature changes or not, but also realizes the function of indicating the temperature change amplitude. Bismuth telluride thermoelectric material is used to power the energy storage module 12, and high-voltage capacitors are used for energy storage and charging and discharging. Based on the relationship between the voltage change and temperature of the bismuth telluride material, the relationship between the capacitor charging and discharging time and the voltage change, and the characteristic that the glow discharge lamp has a starting voltage, the temperature change value of the object to be measured can be quantitatively calculated, and the temperature detection result is more accurate.

[0087] Although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments by those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A temperature measurement system based on image recognition, characterized in that: It includes a passive temperature indicating device arranged on the surface of the object to be measured and an image processing device arranged at a remote end; The passive temperature indicating device comprises a temperature difference power generation module, an energy storage module and an indicator light module; the temperature difference power generation module supplies power to the energy storage module based on the thermoelectric effect when the temperature of the object under test changes, so as to stimulate the indicator light module to emit light and flash; The image processing device is used to collect the video image of the indicator light module, analyze the video image, identify the luminous and flashing area in the video image, and calculate the frequency of the luminous and flashing of the indicator light module, and calculate the temperature change value of the surface of the object under test according to the frequency of the luminous and flashing of the indicator light module.

2. The system according to claim 1, characterized in that The temperature difference power generation module includes a thermoelectric device, a heat dissipation part, a first heat conducting part and a second heat conducting part. The first heat conducting part is arranged between the hot end of the thermoelectric device and the surface of the object to be measured, and the second heat conducting part is arranged between the cold end of the thermoelectric device and the heat dissipation part. The thermoelectric device is made of bismuth telluride material.

3. The system according to claim 1, characterized in that After the image processing device identifies the luminous flickering area in the video image, the luminous flickering frequency is calculated based on the number of times the luminous flickering area lights up and goes out within a preset time period.

4. The system according to claim 1 or 2, characterized in that: The passive temperature indicating device further comprises an insulating housing.

5. The system according to claim 2, characterized in that The passive temperature indicating device also includes a protection module; The protection module includes a fuse, a varistor, a first resistor and a diode, the cathode of the diode is connected to one end of the first resistor, the other end of the first resistor and the anode of the diode are respectively connected to the two ends of the varistor, one end of the varistor is connected to the negative electrode of the thermoelectric device and the anode of the diode, and the other end is connected to one end of the fuse, and the other end of the fuse is connected to the positive electrode of the thermoelectric device.

6. The system according to claim 5, characterized in that The energy storage module includes a high-voltage capacitor, and the high-voltage capacitor is connected in parallel with the diode.

7. The system according to claim 6, characterized in that The indicator light module comprises a second resistor and a glow discharge lamp. The second resistor is connected in series with the glow discharge lamp and then connected in parallel with the high-voltage capacitor.

8. The system according to any one of claims 5 to 7, characterized in that: A light-transmitting element is arranged outside the indicator light module.

9. The system according to claim 7, characterized in that The temperature change of the object being measured is calculated using the following formula: ； Among them, R is the resistance value of the first resistor, C is the capacitance value of the high-voltage capacitor, K is the temperature change value, f is the frequency of the indicator light module flashing, E is the starting voltage of the glow discharge lamp, and ρ is the Seebeck coefficient of the material used in the electric heating device.

10. A temperature measurement method using the system as claimed in any one of claims 1 to 9, characterized in that: include: Collecting a video image of the indicator light module by the image processing device; Analyze the video image, identify the light-emitting and flashing area in the video image, and calculate the light-emitting and flashing frequency of the indicator light module; According to the frequency of the indicator light module flashing, the temperature change value of the surface of the object being measured is calculated.

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