Dual-band multi-channel infrared detector, detection system and temperature calibration method

Abstract

The invention discloses a dual-band multi-channel infrared detector, a detection system and a temperature calibration method, and relates to the technical field of sensing, and the dual-band multi-channel infrared detector comprises a metal shell, two optical filters, a pyroelectric unit and a metal base. The dual-band multi-channel pyroelectric infrared sensor, the detection system and the temperature calibration method can be widely applied to scenes such as high-speed target identification, footpath monitoring systems, target temperature calibration and multi-gas monitoring, have the advantages of low cost and simple structure, and are provided with a plurality of pyroelectric sensitive elements, so that the detection accuracy is improved. The three channels are used as independent channels to collect and process different information, so that the detection requirements of multiple information, interference resistance and low cost can be met.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, and in particular to a dual-band multi-channel infrared detector, a detection system, and a temperature calibration method. Background Art

[0002] Pyroelectric infrared detectors are widely used in temperature measurement, infrared imaging, military guidance and other fields due to their advantages such as non-cooling, simple structure, easy miniaturization and wide response band. At the same time, theories such as the basic law of infrared radiation and two-color temperature measurement have greatly expanded the application range of pyroelectric infrared detectors. However, most of the current research on pyroelectric infrared detectors is single-band single-channel or dual-channel devices. This type of device can provide less information and is difficult to meet the increasingly complex application environment. In addition, the single-band device has weak anti-interference ability. Therefore, there is an urgent need for a dual-band multi-channel infrared detector that can provide multiple sets of dual-band or even multi-band information to meet the detection needs of multi-information, anti-interference and low-cost with a single device. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a dual-band multi-channel infrared detector, a detection system, and a temperature calibration method, which solves the problem that the prior art cannot meet the detection requirements of multiple information, anti-interference and low cost.

[0004] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0005] Provided is a dual-band multi-channel infrared detector comprising a metal housing, two filters, a pyroelectric unit and a metal base;

[0006] The pyroelectric unit is placed inside the metal shell; the inner wall of the metal shell is provided with a groove, and the top of the metal shell is provided with a plurality of symmetrical holes; two filters are directly opposite to the holes and symmetrically embedded in the grooves; the metal base is placed at the bottom of the pyroelectric unit, and the bottom of the metal base is provided with pins; the pins pass through the metal base and are connected to the inside of the pyroelectric unit; wherein:

[0007] Metal housing and metal base to protect the pyroelectric infrared detector;

[0008] A filter, used for selecting infrared light of two bands to enter the pyroelectric unit and inhibiting other light from entering the pyroelectric unit;

[0009] The pyroelectric unit is used to convert the received infrared radiation and output a corresponding electrical signal.

[0010] Furthermore, the pyroelectric unit includes a pyroelectric sensitive element, leads, and a PCB board; the pyroelectric sensitive element is placed on the PCB board and is electrically connected to an external circuit through the leads.

[0011] Furthermore, the number of the pyroelectric sensitive elements is 2n, which are symmetrically distributed and correspond to the holes on the top of the metal shell.

[0012] Furthermore, the upper surface of the pyroelectric sensitive element is covered with an ink absorption layer of 500nm to 5μm, and there is a rectangular or circular area not covered by the ink absorption layer, that is, the area not covered by the ink absorption layer; the area of ​​the upper surface of the pyroelectric sensitive element not covered by the ink absorption layer is connected to the external circuit through a lead.

[0013] Furthermore, the two filters have different selected wavelengths, and select infrared short waves in the wavelength range of [0.75μm, 3μm), infrared medium waves in the wavelength range of [3μm, 5μm], and long waves in the wavelength range of [8μm, 14μm], and each filter covers an area formed by n pyroelectric sensitive elements.

[0014] A detection system is provided, which includes a data acquisition system, a temperature module and a positioning module; the data acquisition system includes an ADC module, an FPGA control module, a serial communication module and a host computer decoding module; wherein:

[0015] The ADC module is used to collect the electrical signal output by the dual-band multi-channel infrared detector and perform analog-to-digital conversion to obtain the corresponding digital signal;

[0016] FPGA control module, used to control the flow direction of data streams generated by the ADC module and the serial communication module;

[0017] The serial communication module is used to upload the digital signal collected by the ADC to the host computer decoding module;

[0018] The host computer decoding module is used to convert the received digital signal into a voltage signal and perform calculations to obtain the corresponding dual-band ratio;

[0019] The temperature module is used to process the dual-band ratio to obtain the target temperature of the target to be measured;

[0020] The positioning module is used to obtain the electrical signal output by the dual-band multi-channel infrared detector and the angle-output relationship of the pyroelectric sensitive element and process the dual-band ratio to obtain the position information of the target to be measured relative to the dual-band multi-channel infrared detector.

[0021] Furthermore, the dual-band ratio r i The calculation formula is:

[0022]

[0023] Among them, m i represents the output voltage of the ith pyroelectric sensitive element that absorbs the medium wave, l iRepresents the output voltage of the i-th pyroelectric sensitive element that absorbs long waves.

[0024] Furthermore, the calculation formula of the positioning module is:

[0025]

[0026] Wherein, d1 represents the distance between two pyroelectric sensitive elements close to the target to be measured on one side of the x direction, θ1 and θ2 represent the deflection angles of the two pyroelectric sensitive elements close to the target to be measured on one side of the x direction, R1 represents the dual-band ratio corresponding to the two pyroelectric sensitive elements close to the target to be measured on one side of the x direction, θ3 represents the third angle of the triangle including θ1 and θ2 formed by the two pyroelectric sensitive elements and the target to be measured, sin(·) represents the sine function, cos(·) represents the cosine function, y0 represents the position information of the target to be measured in the y direction, z0 represents the position information of the target to be measured in the z direction, d1′ represents the distance between two pyroelectric sensitive elements close to the target to be measured on one side of the y direction, θ1′ and θ2′ represent the deflection angles of two pyroelectric sensitive elements close to the target to be measured on one side of the y direction, θ3′ represents the third angle of the triangle including θ1′ and θ2′ formed by the two pyroelectric sensitive elements and the target to be measured, R1′ represents the projection distance of the line connecting the pyroelectric sensitive element close to the target to be measured on the xz plane in the middle area of ​​the y direction, and x0 represents the position information of the target to be measured in the x direction.

[0027] A temperature calibration method is provided, which comprises the following steps:

[0028] S1, start the dual-band multi-channel infrared detector;

[0029] S2, keeping the target distance and position of the test black body unchanged, adjusting the black body temperature respectively, exciting the dual-band multi-channel infrared detector through the chopper, and obtaining the corresponding three sets of dual-band signals;

[0030] S3, collecting and processing three sets of dual-band signals through a data acquisition system to obtain three sets of corresponding dual-band ratios;

[0031] S4. Determine the corresponding relationship between the dual-band ratio and the temperature of the test black body Tr i , and list them to generate the corresponding relationship list;

[0032] S5. When the distance between the target to be measured and the dual-band multi-channel infrared detector remains unchanged, the dual-band ratio of the current target is calculated and searched in the relationship list to obtain the target temperature and perform calibration.

[0033] The beneficial effects of the present invention are: the dual-band multi-channel infrared detector, detection system, and temperature calibration method can be widely used in scenarios such as high-speed target recognition, trail monitoring systems, target temperature calibration, and multi-gas monitoring. It has the advantages of low cost and simple structure, and multiple pyroelectric sensitive elements are arranged, which serve as independent channels to collect and process different information, thereby meeting the detection needs of multiple information, anti-interference, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a pyroelectric infrared detector;

[0035] Figure 2 A diagram showing the relationship between the pyroelectric sensitive element and the filter of the pyroelectric infrared sensor according to an embodiment of the present invention;

[0036] Figure 3 A data flow chart of a data acquisition system according to an embodiment of the present invention;

[0037] Figure 4 is a curve diagram showing the relationship between the dual-band ratio and temperature in an embodiment of the present invention;

[0038] Figure 5 A schematic diagram of a method for determining the relative position of a target based on different fields of view of a pyroelectric sensitive element proposed in an embodiment of the present invention;

[0039] Figure 6 The output curve diagram of the pyroelectric sensing elements at two positions ch1 and ch6 on both sides of the symmetry axis of the present invention at different angles;

[0040] Figure 7 A schematic diagram of the position of a target positioning method based on a 2×3 array type pyroelectric infrared detector proposed in an embodiment of the present invention;

[0041] Among them: 1. Metal shell; 2. Filter; 3. Pyroelectric sensitive element; 4. Lead wire; 5. PCB board; 6. Metal base. DETAILED DESCRIPTION

[0042] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0043] Example 1

[0044] A dual-band multi-channel infrared detector comprises a metal housing 1, two filters 2, a pyroelectric unit and a metal base 6;

[0045] The pyroelectric unit is placed inside the metal shell 1; the inner wall of the metal shell 1 is provided with a groove, and the top of the metal shell 1 is provided with a plurality of symmetrical holes, and the shape of the holes is not limited to round and square; the two filters 2 are opposite to the holes and symmetrically embedded in the grooves; the metal base 6 is placed at the bottom of the pyroelectric unit, and the bottom of the metal base 6 is provided with pins; the pins pass through the metal base 6 and are connected to the inside of the pyroelectric unit; wherein:

[0046] The metal housing 1 and the metal base 6 are used to protect the pyroelectric infrared detector;

[0047] Filter 2, used for selecting infrared light of two bands to enter the pyroelectric unit and inhibiting other light from entering the pyroelectric unit;

[0048] The pyroelectric unit is used to convert the received infrared radiation and output a corresponding electrical signal.

[0049] The pyroelectric unit includes a pyroelectric sensitive element 3 , a lead 4 , and a PCB board 5 ; the pyroelectric sensitive element 3 is placed on the PCB board 5 and is electrically connected to an external circuit through the lead 4 .

[0050] The number of the pyroelectric sensing elements 3 is 2n, which are symmetrically distributed and correspond to the holes on the top of the metal housing 1 .

[0051] The upper surface of the pyroelectric sensitive element 3 is covered with an ink absorption layer of 500nm to 5μm, and there is a rectangular or circular area not covered by the ink absorption layer, that is, the area not covered by the ink absorption layer; the area not covered by the ink absorption layer on the upper surface of the pyroelectric sensitive element 3 is connected to the external circuit through the lead 4. The two filters 2 have different selected wavelengths, and the selected wavelength range is [0.75μm, 3μm) infrared short wave, wavelength range [3μm, 5μm] infrared medium wave and wavelength range [8μm, 14μm] long wave, and each filter 2 covers the area formed by n pyroelectric sensitive elements 3.

[0052] Pyroelectric infrared detectors use TO series or other metal packages.

[0053] Example 2

[0054] On the basis of Example 1, Figure 1 As shown, the dual-band multi-channel infrared detector in Example 2 has a metal housing 1, two filters 2, a pyroelectric unit and a metal base 6; the pyroelectric unit includes a pyroelectric sensitive element 3, a lead 4, and a PCB board 5;

[0055] The number of pyroelectric sensing elements 3 is 6, which are placed on the top of the PCB board 5 in a 2×3 array; the top of the metal housing 1 is provided with 6 square holes; Figure 2As shown, the infrared radiation wavelengths that can be transmitted by the two filters 2 are infrared medium waves with a wavelength range of [3μm, 5μm] and long waves with a wavelength range of [8μm, 14μm], and they respectively cover 1×3 pyroelectric sensitive elements 3; the pyroelectric infrared sensor adopts a TO8 (H-12) packaging structure.

[0056] Each pyroelectric sensor 3 is used as an independent channel, and the power supply VCC, the ground GND and the outputs of 2×3 channels are arranged around the PCB board 5 and output through the pins of the metal base 6.

[0057] The infrared radiation signal is converted into an analog electrical signal for output. Each band has 3 signal outputs, and three sets of dual-band signals can be obtained. Infrared radiation can reflect the temperature characteristics of the measured target under a certain wavelength, and the output of the pyroelectric sensitive element 3 reflects the infrared radiation intensity, and then correlates to the temperature. According to the two-color temperature measurement method:

[0058]

[0059] The corresponding temperature value T is obtained; wherein C2 represents Planck’s second radiation constant, λ1 and λ2 represent the wavelengths of two infrared lights respectively, ln(·) represents the logarithmic function with the natural parameter e as the base, M(λ1,T) represents the output of the pyroelectric infrared detector corresponding to the infrared light with a wavelength of λ1, and M(λ2,T) represents the output of the pyroelectric infrared detector corresponding to the infrared light with a wavelength of λ2.

[0060] Example 3

[0061] Based on Example 2, Example 3 provides a detection system, which includes a data acquisition system, a temperature module and a positioning module; Figure 3 As shown, the data acquisition system includes an ADC module, an FPGA control module, a serial communication module and a host computer decoding module; wherein:

[0062] The ADC module is used to collect the electrical signal output by the dual-band multi-channel infrared detector and perform analog-to-digital conversion to obtain the corresponding digital signal;

[0063] FPGA control module, used to control the flow direction of data streams generated by the ADC module and the serial communication module;

[0064] The serial communication module is used to upload the digital signal collected by the ADC to the host computer decoding module;

[0065] The host computer decoding module is used to convert the received digital signal into a voltage signal and perform calculations to obtain the corresponding dual-band ratio;

[0066] The temperature module is used to process the dual-band ratio to obtain the target temperature of the target to be measured;

[0067] The positioning module is used to obtain the electrical signal output by the dual-band multi-channel infrared detector and the angle-output relationship of the pyroelectric sensitive element 3 and process the dual-band ratio to obtain the position information of the target to be measured relative to the dual-band multi-channel infrared detector.

[0068] Dual band ratio r i The calculation formula is:

[0069]

[0070] Among them, m i represents the output voltage of the ith pyroelectric sensitive element 3 that absorbs the medium wave, l i Represents the output voltage of the i-th pyroelectric sensitive element 3 that absorbs long waves.

[0071] The calculation formula of the positioning module is:

[0072]

[0073] Wherein, d1 represents the distance between two pyroelectric sensitive elements 3 close to the target to be measured on one side of the x direction, θ1, θ2, and θ3 represent the deflection angles of the two pyroelectric sensitive elements 3 close to the target to be measured on one side of the x direction, and the third angle in the triangle including θ1 and θ2 formed by the two pyroelectric sensitive elements 3 and the target to be measured, respectively; R1 represents the dual-band ratio corresponding to the two pyroelectric sensitive elements 3 close to the target to be measured on one side of the x direction, θ3 represents the third angle in the triangle including θ1 and θ2 formed by the two pyroelectric sensitive elements 3 and the target to be measured, sin(·) represents the sine function, cos(·) represents the cosine function, and y0 represents the position information of the target to be measured in the y direction, z0 represents the position information of the target to be measured in the z direction, d1′ represents the distance between two pyroelectric sensitive elements 3 close to the target to be measured on one side of the y direction, θ1′, θ2′, θ3′ represent the deflection angles of the two pyroelectric sensitive elements 3 close to the target to be measured on one side of the y direction, and the third angle of the triangle including θ1′ and θ2′ formed by the two pyroelectric sensitive elements 3 and the target to be measured, R1′ represents the projection distance of the line connecting the pyroelectric sensitive element 3 close to the target to be measured on the xz plane in the middle area of ​​the y direction, and x0 represents the position information of the target to be measured in the x direction.

[0074] Example 4

[0075] Based on Example 3, Example 4 provides a temperature calibration method based on a detection system, which includes the following steps:

[0076] S1, start the dual-band multi-channel infrared detector;

[0077] S2, keeping the target distance and position of the test black body unchanged, adjusting the black body temperature respectively, exciting the dual-band multi-channel infrared detector through the chopper, and obtaining the corresponding three sets of dual-band signals;

[0078] S3, collecting and processing three sets of dual-band signals through a data acquisition system to obtain three sets of corresponding dual-band ratios;

[0079] S4. Determine the corresponding relationship between the dual-band ratio and the temperature of the test black body Tr i , and list them to generate the corresponding relationship list, such as Figure 4 As shown in the figure, since the medium wave signal is more sensitive to temperature, the growth rate of the medium wave signal is greater than that of the long wave signal during the temperature increase. Therefore, the dual-band ratio in the figure shows a trend of increasing with increasing temperature.

[0080] S5. When the distance between the target to be measured and the dual-band multi-channel infrared detector remains unchanged, the dual-band ratio of the current target is calculated and searched in the relationship list to obtain the target temperature and perform calibration. The target temperature is determined by referring to the relationship list generated in step S4 using the obtained dual-band ratio of the target to be measured. The calibration coefficient of the dual-band multi-channel infrared detector is adjusted using the target temperature as a reference to ensure that the measurement result is consistent with the target temperature. The adjusted calibration coefficient and corresponding temperature are recorded to complete the calibration.

[0081] Example 5

[0082] Based on Example 3, a dual-band multi-channel infrared detector can be used for positioning, so Example 5 provides a method for determining the position of a target. When the target is on one side of the detector, the outputs of the sensitive elements at different arrangement positions are different due to their different fields of view. The sensitive elements are symmetrically distributed. When the target is on one side of the symmetry axis, the output of the sensitive element close to the target is large, while the output of the sensitive element far from the target is small, thereby determining the position of the target relative to the detector.

[0083] like Figure 5 and Figure 6 As shown in the figure, when the symmetry axis divides the sensitive elements into a 2×3 array, series 1 channels are ch1, ch2, ch3, and series 2 channels are ch6, ch5, ch4, which correspond to each other one by one. Under the condition that the temperature and emissivity of the target remain unchanged, the experimental results show that the change trend of a single channel with angle is symmetrical, and the target position cannot be distinguished. However, due to the different arrangement positions of multiple sensitive elements, the relationship between the output and the angle has a certain phase difference, which can determine the position of the target relative to the detector.

[0084] A method for determining a target position comprises the following steps:

[0085] A1. Establish the angle-output correspondence through machine learning based on the relationship between the output and angle of different pyroelectric sensitive elements tested in the experiment;

[0086] A2, taking the xy plane as the top view of the pyroelectric sensitive element 3, the plane is divided into left and right regions along the x direction, and into upper, middle and lower regions along the y direction according to the arrangement of the pyroelectric sensitive elements 3;

[0087] A3. When the target is located at a certain position above the detector, the output is large when it is close to the pyroelectric sensitive element, and the position of the target relative to the sensor is obtained. The position description can be upper left, middle left, lower left, upper right, middle right, lower right, such as Figure 7 As shown, it is taken as an example that the target to be measured is located in the upper left area of ​​the sensor;

[0088] A4. Select the outputs of two pyroelectric sensitive elements 3 close to the target on one side of the x direction as the basis, map the positional relationship between the two pyroelectric sensitive elements 3 and the target to be measured to the yz plane, and solve the triangle according to the sine theorem based on the known distance d1 between the pyroelectric sensitive elements 3 and the deflection angles θ1 and θ2, and obtain the following relationship:

[0089]

[0090] Wherein, d1 represents the distance between two pyroelectric sensitive elements 3 close to the target to be measured on one side of the x direction, R1 represents the dual-band ratio corresponding to the two pyroelectric sensitive elements 3 close to the target to be measured on one side of the x direction, θ3 represents the third angle of the triangle including θ1 and θ2 formed by the two pyroelectric sensitive elements 3 and the target to be measured, sin(·) represents the sine function, cos(·) represents the cosine function, y0 represents the position information of the target to be measured in the y direction, and z0 represents the position information of the target to be measured in the z direction.

[0091] A5. Select the outputs of two pyroelectric sensitive elements 3 close to the target on one side of the y direction as the basis, and map the positional relationship between the two pyroelectric sensitive elements 3 and the target to be measured onto the xz plane. Same as step S4, the following relationship can be obtained:

[0092]

[0093] Among them, d1′ represents the distance between two pyroelectric sensitive elements 3 close to the target to be measured on one side of the y direction, θ1′ and θ2′ respectively represent the deflection angles of the two pyroelectric sensitive elements 3 close to the target to be measured on one side of the y direction, θ3′ represents the third angle of the triangle including θ1′ and θ2′ formed by the two pyroelectric sensitive elements 3 and the target to be measured, R1′ represents the projection distance of the line connecting the pyroelectric sensitive element 3 close to the target to be measured on the side of the middle area in the y direction and the target to be measured on the xz plane, and x0 represents the position information of the target to be measured in the x direction.

[0094] In summary, the dual-band multi-channel pyroelectric infrared sensor, detection system, and temperature calibration method can be widely used in scenarios such as high-speed target recognition, trail monitoring systems, target temperature calibration, and multi-gas monitoring. It has the advantages of low cost and simple structure, and multiple pyroelectric sensitive elements 3 are set up, which are used as independent channels to collect and process different information, which can meet the detection needs of multiple information, anti-interference, and low cost.

Claims

1. A dual-band multi-channel infrared detector, characterized in that: It comprises a metal housing (1), two filters (2), a pyroelectric unit and a metal base (6); The pyroelectric unit is placed inside the metal shell (1); the inner wall of the metal shell (1) is provided with a groove, and the top of the metal shell (1) is provided with a plurality of symmetrical holes; the two optical filters (2) are directly opposite the holes and symmetrically embedded in the grooves; the metal base (6) is placed at the bottom of the pyroelectric unit, and the bottom of the metal base (6) is provided with a pin; the pin passes through the metal base (6) and is connected to the inside of the pyroelectric unit; wherein: A metal housing (1) and a metal base (6) for protecting the pyroelectric infrared detector; The filter (2) is used to allow infrared light of a selected wavelength band to enter the pyroelectric unit and inhibit other light from entering the pyroelectric unit; The pyroelectric unit is used to convert the received infrared radiation and output a corresponding electrical signal.

2. The dual-band multi-channel infrared detector according to claim 1, characterized in that: The pyroelectric unit comprises a pyroelectric sensitive element (3), a lead wire (4), and a PCB board (5); the pyroelectric sensitive element (3) is placed on the PCB board (5) and is electrically connected to an external circuit via the lead wire (4).

3. The dual-band multi-channel infrared detector according to claim 2, characterized in that: The number of the pyroelectric sensitive elements (3) is 2n, which are symmetrically distributed and correspond to the holes on the top of the metal shell (1).

4. The dual-band multi-channel infrared detector according to claim 2, characterized in that: The upper surface of the pyroelectric sensitive element (3) is covered with an ink absorption layer of 500nm to 5μm, and there is a rectangular or circular area not covered by the ink absorption layer, that is, the area not covered by the ink absorption layer; the area on the upper surface of the pyroelectric sensitive element (3) not covered by the ink absorption layer is connected to an external circuit through a lead (4).

5. The dual-band multi-channel infrared detector according to claim 3, characterized in that: The two filters (2) have different selected wavelengths, and select infrared short waves in the wavelength range of [0.75 μm, 3 μm), infrared medium waves in the wavelength range of [3 μm, 5 μm], and long waves in the wavelength range of [8 μm, 14 μm], and each filter (2) covers an area formed by n pyroelectric sensitive elements (3).

6. A detection system based on the dual-band multi-channel infrared detector according to any one of claims 1 to 5, characterized in that: It includes a data acquisition system, a temperature module and a positioning module; the data acquisition system includes an ADC module, an FPGA control module, a serial communication module and a host computer decoding module; wherein: The ADC module is used to collect the electrical signal output by the dual-band multi-channel infrared detector and perform analog-to-digital conversion to obtain the corresponding digital signal; FPGA control module, used to control the flow direction of data streams generated by the ADC module and the serial communication module; The serial communication module is used to upload the digital signal collected by the ADC to the host computer decoding module; The host computer decoding module is used to convert the received digital signal into a voltage signal and perform calculations to obtain the corresponding dual-band ratio; The temperature module is used to process the dual-band ratio to obtain the target temperature of the target to be measured; The positioning module is used to obtain the electrical signal output by the dual-band multi-channel infrared detector and the angle-output relationship of the pyroelectric sensitive element (3) and process the dual-band ratio to obtain the position information of the target to be measured relative to the dual-band multi-channel infrared detector.

7. The detection system according to claim 6, characterized in that: The dual-band ratio r i The calculation formula is: Among them, m i represents the output voltage of the ith pyroelectric sensor (3) that absorbs the medium wave, l i It represents the output voltage of the i-th pyroelectric sensitive element (3) that absorbs long waves.

8. The detection system according to claim 6, characterized in that: The calculation formula of the positioning module is: Wherein, d1 represents the distance between two pyroelectric sensitive elements (3) close to the target to be measured on one side of the x direction, θ1 and θ2 represent the deflection angles of the two pyroelectric sensitive elements (3) close to the target to be measured on one side of the x direction, R1 represents the dual-band ratio corresponding to the two pyroelectric sensitive elements (3) close to the target to be measured on one side of the x direction, θ3 represents the third angle of the triangle including θ1 and θ2 formed by the two pyroelectric sensitive elements (3) and the target to be measured, sin(·) represents the sine function, cos(·) represents the cosine function, y0 represents the position information of the target to be measured in the y direction, z0 represents the position information of the target to be measured in the z direction, d1′ represents the distance between two pyroelectric sensitive elements (3) close to the target to be measured on one side of the y direction, θ1′ and θ2′ respectively represent the deflection angles of the two pyroelectric sensitive elements (3) close to the target to be measured on one side of the y direction, θ3′ represents the third angle of the triangle including θ1′ and θ2′ formed by the two pyroelectric sensitive elements (3) and the target to be measured, R1′ represents the projection distance of the line connecting the pyroelectric sensitive element (3) close to the target to be measured on the xz plane in the middle area of ​​the y direction, and x0 represents the position information of the target to be measured in the x direction.

9. A temperature calibration method for a detection system according to any one of claims 6 to 8, characterized in that: The following steps are involved: S1, start the dual-band multi-channel infrared detector; S2, keeping the target distance and position of the test black body unchanged, adjusting the black body temperature respectively, exciting the dual-band multi-channel infrared detector through the chopper, and obtaining the corresponding three sets of dual-band signals; S3, collecting and processing three sets of dual-band signals through a data acquisition system to obtain three sets of corresponding dual-band ratios; S4. Determine the corresponding relationship between the dual-band ratio and the temperature of the test black body Tr i , and list them to generate the corresponding relationship list; S5. When the distance between the target to be measured and the dual-band multi-channel infrared detector remains unchanged, the dual-band ratio of the current target is calculated and searched in the relationship list to obtain the target temperature and perform calibration.

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