Infrared radiation shielding device, infrared detector calibration method and self-checking method

Abstract

The present application relates to a kind of infrared radiation shielding device, infrared detector calibration method and self-checking method, belong to infrared testing technical field, solve the low problem of the precision of existing calibration to infrared detector.It includes support, shielding piece and shielding piece angle adjusting assembly;The shielding piece angle adjusting assembly is used to linearly adjust the rotation angle of shielding piece.The infrared radiation shielding device of the present application can linearly form different sizes of shielding surface and penetration surface by linearly adjusting the rotation angle of shielding piece, so that the infrared radiation energy received by the photosensitive surface of the detection sensitive element of infrared detector is linearly adjustable, so that the calibration coefficient under the linearly changing infrared radiation energy can be obtained, so that the calibration result is more stable and accurate.

Description

Technical Field

[0001] The present invention relates to the field of infrared testing, and in particular to an infrared radiation shielding device, an infrared detector calibration method and a self-testing method. Background Art

[0002] When using an infrared detector to measure the infrared emissivity of a material, the thermal radiation generated by the detector itself will irradiate the detector's sensitive elements in the form of infrared light, adversely affecting the detector's output response. In severe cases, this can cause the output voltage data to drift, reducing the detector's detection accuracy and making it difficult to use. Therefore, in order to maximize the infrared detector's performance advantages within its inherent operating environment and improve the stability and accuracy of its output voltage, it is necessary to calibrate the infrared detector itself.

[0003] Existing calibration methods generally use the method of changing the blackbody temperature to calibrate the detector. At the same time, because the emissivity of the blackbody is only close to 1, the nonlinear effect brought by the existing calibration method is more prominent when used, making the calibration inaccurate and unstable. Summary of the Invention

[0004] In view of the above analysis, the embodiments of the present invention aim to provide an infrared radiation shielding device, an infrared detector calibration method and a self-test method, so as to solve the problems of instability and low calibration accuracy of existing calibration methods.

[0005] On the one hand, the present invention provides an infrared radiation shielding device, including a bracket, a plurality of shielding members and a plurality of shielding member angle adjustment assemblies; the shielding member angle adjustment assemblies are used to linearly adjust the rotation angle of the shielding members.

[0006] Furthermore, the shielding member angle adjustment assembly includes a drive motor, a bearing, a coupling and a connecting member; the drive motor is connected to the bearing through the coupling, and the connecting member is fixedly connected to the axial center position of the bearing.

[0007] Furthermore, the connecting member is columnar, and is provided with a mounting groove along the axial direction, and the shielding member is inserted into the mounting groove and the connecting member.

[0008] Furthermore, the bracket is a circular mounting frame, and a plurality of bearing mounting holes are provided in the circular mounting frame.

[0009] Furthermore, two adjacent bearing mounting holes are circumferentially arranged in the annular mounting frame at an angle of 90 degrees therebetween.

[0010] Furthermore, the connecting piece is located inside the inner wall of the circular ring mounting frame, the bearing is located in the bearing mounting hole, and the driving motor and the coupling are located outside the outer wall of the circular ring mounting frame.

[0011] Furthermore, a protective shell is provided on the outer side wall of the annular mounting frame at a position corresponding to the bearing mounting hole.

[0012] Furthermore, the coupling is arranged in the protective shell.

[0013] On the other hand, the present invention also provides a calibration method for an infrared detector based on the aforementioned shielding device, the method comprising the following steps:

[0014] Align the axis of the shielding device's bracket with the blackbody's light-emitting hole, and align the infrared detector window with the axis of the shielding device's bracket; ensure that the plane where the multiple shielding components are located is parallel to the infrared radiation emission direction;

[0015] Set the blackbody calibration temperature, wait for the blackbody radiation to stabilize, obtain the initial infrared radiation L0 and the initial output response value V0 of the infrared detector; calculate the initial calibration coefficient R0 based on the initial infrared radiation L0 and the initial output response value V0 of the infrared detector;

[0016] Start the stepper motor to make multiple shielding parts rotate gradually at the same speed to form different fan-shaped shielding areas. Infrared radiation is emitted from the fan-shaped penetration surface that is not blocked by the shielding parts, and the infrared detector receives different infrared radiation amounts L i Irradiation, obtain different infrared radiation amounts L i When irradiated, the infrared detector outputs a response of V i ;

[0017] According to the above different infrared radiation amounts L i , and different infrared radiation amounts L i The corresponding infrared detector output response value V i Calculate different infrared radiation amounts L i Corresponding calibration coefficient R i ;

[0018] The calibration coefficients R0, R i And the infrared detector output response value V0, V i Interpolation fitting is performed to obtain the relationship between the infrared detector output response value V and the calibration coefficient R.

[0019] At the same time, the present invention also provides a self-test method based on the aforementioned shielding device, the method comprising the following steps:

[0020] Align the axis of the shielding device's bracket with the blackbody's light-emitting hole, and align the infrared detector window with the axis of the shielding device's bracket; ensure that the plane where the multiple sector-shaped shielding elements are located is perpendicular to the infrared radiation emission direction;

[0021] Set the calibration temperature of the blackbody, wait for the blackbody radiation to stabilize, open the first group of multiple sets of shielding angle adjustment components, and rotate the corresponding shielding element θ 1 ; Get the output response value V of the infrared detector 1 ;

[0022] Return the shielding members in the first set of shielding member angle adjustment assemblies to a plane perpendicular to the infrared radiation emission direction; open the second set of multiple shielding member angle adjustment assemblies, so that the corresponding shielding members rotate θ 2 ; Get the output response value V of the infrared detector 2 ;

[0023] Repeat the above steps to obtain the shielding member rotation θ of the corresponding area of ​​other different groups of shielding member angle adjustment components n After that, the output response value of the infrared detector V n ; where θ 1 =θ 2 =θ n ;

[0024] The obtained multiple regions output response values ​​V 1 、V 2 、V n Comparison is performed. If the obtained values ​​are equal or similar, the infrared radiation shielding device is not faulty. If the obtained values ​​differ greatly, the infrared radiation shielding device is faulty and needs to be calibrated.

[0025] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0026] 1. Compared with the traditional method of calibrating infrared detectors by changing the temperature of a black body and thus changing the black body's output energy, the infrared radiation shielding device of the present invention can change the black body's output energy without changing the black body's temperature, thereby achieving linear calibration of the infrared detector. It is a simple and easy method.

[0027] 2. The infrared radiation shielding device of the present invention does not need to change the temperature of the initially calibrated black body, so that the black body's emitted energy remains constant. The advantage of this is that it can avoid the influence of the constantly changing emitted energy of the black body on the black body's own emissivity, thereby avoiding the influence of the irregular changes of the black body radiation energy and black body emissivity on the detector calibration coefficient when calculating the detector calibration coefficient, and obtaining a stable detector calibration coefficient.

[0028] 3. The calibration method of the present invention does not need to change the temperature of the blackbody used for initial calibration, which avoids the long waiting time after changing the blackbody temperature in the traditional calibration method. Since the blackbody takes a long time to stabilize, this will cause the calibration cycle to be too long and take a lot of time. The present invention no longer changes the blackbody temperature after setting the initial calibration value, and there is no need to wait for the subsequent blackbody to stabilize, which greatly shortens the calibration cycle of the detector and saves time.

[0029] 4. When the infrared radiation shielding device of the present invention is calibrated, multiple shielding parts change the rotation angle at the same time and participate in the adjustment of the shielding area at the same time, which can improve the calibration efficiency; in addition, since the shielding area is a fan-shaped adjustment area, the adjustment of infrared radiation is also a fan-shaped adjustment, which can reduce the nonlinearity of the radiation energy change, making the adjustment of infrared radiation tend to linear adjustment, thereby improving the accuracy of calibration.

[0030] 5. The multiple shielding members of the infrared radiation shielding device of the present invention can be controlled and driven to rotate separately, which can realize the self-inspection process of the infrared radiation shielding device, simplifying the structural setting while realizing the self-inspection process at any time, and facilitating operation.

[0031] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following description, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0033] Figure 1 This is an overall schematic diagram of the infrared radiation shielding device of the present invention;

[0034] Figure 2 is a schematic diagram of the shielding member angle adjustment assembly of the present invention;

[0035] Figure 3 This is a schematic diagram of the four shielding members of the present invention abutting against each other at the center end;

[0036] Figure 4 This is a flow chart of the infrared detector calibration method of the present invention.

[0037] Reference numerals:

[0038] 1- bracket; 2- driving motor; 3- shielding member; 4- bearing; 5- coupling; 6- connecting member; 7- fan-shaped penetration surface. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0040] Example 1:

[0041] A specific embodiment of the present invention discloses an infrared radiation shielding device, such as Figure 1-4 As shown, it includes a bracket 1, multiple shielding members 3 and multiple groups of shielding member angle adjustment components; the shielding member angle adjustment components are used to linearly adjust the rotation angle of the shielding members 3. Preferably, four groups of shielding member angle adjustment components are provided, and four shielding members 3 are provided.

[0042] Compared with the existing technology, the infrared radiation shielding device provided in this embodiment can linearly form shielding surfaces and penetration surfaces of different sizes by linearly adjusting the rotation angle of the shielding member, so that the infrared radiation energy received by the photosensitive surface of the infrared detector detection sensitive element can be linearly adjusted. Therefore, the calibration coefficient under the linearly changing infrared radiation energy can be obtained, making the calibration result more stable and accurate.

[0043] Optionally, the shielding member angle adjustment assembly includes a drive motor 2, a bearing 4, a coupling 5 and a connecting member 6; the drive motor 2 is connected to the bearing 4 through the coupling 5, and the connecting member 6 is fixedly connected to the axial center position of the bearing 4; the connecting member 6 is columnar, and the connecting member 6 is provided with an installation groove along the axial direction, and the shielding member 3 is inserted into the installation groove and fixedly connected to the connecting member 6; the bearing 4, the coupling 5 and the connecting member 6 are coaxially arranged in sequence; preferably, the drive motor 2 is a stepper motor.

[0044] Optionally, the bracket 1 is a circular mounting frame, and a plurality of bearing mounting holes are provided in the circular wall of the circular mounting frame, and the bearing mounting holes are used to install bearings; preferably, there are 4 bearing mounting holes, and two adjacent bearing mounting holes are circumferentially arranged in the circular mounting frame at an angle of 90 degrees between them, and 4 groups of shielding member angle adjustment assemblies respectively partially penetrate the inner side of the circular mounting frame from the outer side of the circular mounting frame through the bearing mounting holes. Specifically, the connecting member 6 is located inside the inner wall of the circular mounting frame, the bearing is located in the bearing mounting hole, and the drive motor 2 and the coupling 5 are located outside the outer wall of the circular mounting frame.

[0045] Furthermore, in order to protect the structural parts, a protective shell is provided on the outer wall of the annular mounting frame at a position corresponding to the bearing mounting hole, and the coupling 5 is provided in the protective shell; the drive motor 2 is located outside the protective shell.

[0046] Optionally, the shielding member 3 is a fan-shaped shielding piece, the fan-shaped central angle of the fan-shaped shielding piece is 90 degrees, and the radius of the fan-shaped shielding piece is the same as the radius of the inner circle of the ring mounting frame, that is: when the fan-shaped surfaces of the four fan-shaped shielding pieces are perpendicular to the axis of the ring mounting frame, the circle formed by the four fan-shaped shielding pieces will cover the inner circle of the ring mounting frame; the middle position of the arc long side of the fan-shaped shielding piece is fixedly connected to the connecting piece 6; see attached Figure 3 The center end of the sector-shaped shielding piece is provided with a taper, and the center ends of the four sector-shaped shielding pieces abut against each other through the taper, so as to realize contact and relative rotation between each sector-shaped shielding piece.

[0047] Furthermore, a mounting hole is provided at the center end of the sector-shaped shielding piece, which is arranged in the direction of the connecting member 6; a stabilizing bracket (not shown in the figure) is also provided, and the stabilizing bracket is provided with a plurality of symmetrically arranged support rods, and the plurality of support rods are located in the same horizontal plane, and one end of the plurality of support rods is arranged to scatter outward from the same center point; when in use, the sector-shaped shielding piece is passed through the mounting hole on the support rod of the corresponding stabilizing bracket, and when the plurality of sector-shaped shielding pieces rotate, the stabilizing bracket can play an auxiliary stabilizing role; preferably, the number of support rods is 4.

[0048] Furthermore, to facilitate installation, the end face of the circular mounting frame, where the bearing mounting holes are located, is configured as a removable mounting block. The inner end face of the removable mounting block is provided with a groove that forms part of the bearing mounting hole, and the outer end face is capable of locking with the end face of the circular mounting frame. During use, the fan-shaped shielding piece, stabilizing bracket, and multiple sets of shielding angle adjustment components are first installed. The removable mounting block is then opened, and the installed fan-shaped shielding piece, stabilizing bracket, and multiple sets of shielding angle adjustment components are placed into the circular mounting frame. The removable mounting block is then closed and locked.

[0049] To ensure the shielding effect, preferably, the shielding member 3 is made of a material with high reflectivity to infrared radiation, and the reflectivity is not less than 0.9.

[0050] Furthermore, in order to increase the stability of the shielding member 3 during rotation, a circular groove is provided on the inner wall of the ring mounting frame corresponding to the bearing mounting hole, and a slip ring is provided at one end of the connecting member 6 relative to the inner wall of the ring mounting frame. The slip ring slides in cooperation with the circular groove and can rotate circumferentially in the circular groove, thereby improving the stability of the connecting member 6 during rotation and thereby increasing the stability of the shielding member 3 during rotation.

[0051] It is worth noting that when a movable loading and unloading block is provided, a slide groove is also provided on the inner side wall of the movable loading and unloading block, and the slide groove is a part of the circular slide groove on the inner side wall of the ring mounting frame.

[0052] The infrared radiation shielding device of the present invention can form sector-shaped shielding surfaces of varying sizes by having the drive motors 2 of each of the four shielding angle adjustment assemblies drive the respective shielding members 3 to rotate synchronously. By controlling the rotational speed of the drive motors 2 of each of the four shielding angle adjustment assemblies, the infrared radiation energy reaching the photosensitive surface of the infrared detector can be linearly adjusted. Thus, a calibration coefficient can be obtained under linearly varying infrared radiation energy, making the calibration coefficient more stable and accurate. Furthermore, the drive motors 2 of each of the four shielding angle adjustment assemblies can each drive the respective shielding members 3 to rotate sequentially, enabling a self-test process for the infrared radiation shielding device. This simplifies the structural setup while enabling the self-test process to be performed at any time, facilitating operation.

[0053] For example, during implementation, when the infrared radiation shielding device is in its initial state, the fan-shaped planes of the four fan-shaped shielding pieces are parallel to the infrared radiation emission direction. The four sets of shielding member angle adjustment assemblies are activated, and the four shielding members 3 rotate in the same direction and at the same speed, linearly forming fan-shaped shielding surfaces and fan-shaped penetration surfaces 7 of varying sizes. This means that the present application can achieve simultaneous adjustment of the shielding area in four directions, allowing for rapid adjustment of the shielding area, facilitating the rapid and linear acquisition of calibration coefficients for different radiation energies.

[0054] Example 2:

[0055] The embodiment of the present invention also provides a calibration method for the infrared detector based on the shielding device in embodiment 1, such as Figure 1-4 As shown, the method includes the following steps:

[0056] S1. Align the axis of the shielding device's bracket with the blackbody's light-emitting hole, and align the infrared detector window with the axis of the shielding device's bracket; ensure that the planes of the multiple shielding components are parallel to the infrared radiation emission direction;

[0057] S2. Set the blackbody calibration temperature, wait for the blackbody radiation to stabilize, and then obtain the initial output response value V0 of the infrared detector; calculate the initial calibration coefficient R0 based on the initial infrared radiation L0 and the initial output response value V0 of the infrared detector;

[0058] S3, start the driving motor, so that the multiple shielding members gradually rotate at the same speed, forming different fan-shaped shielding areas, and the infrared radiation is emitted from the fan-shaped penetration surface 7 that is not blocked by the shielding member 3, and the infrared detector receives different infrared radiation amounts L i Irradiation, obtain different infrared radiation amounts L i When irradiated, the infrared detector outputs a response value V i ;

[0059] S4, according to the above different infrared radiation amounts L i , and different infrared radiation amounts L iThe corresponding infrared detector output response value V i Calculate the calibration coefficient R corresponding to different infrared radiation amounts i ;

[0060] S5, the calibration coefficients R0, R i And the infrared detector output response value V0, V i Interpolation fitting is performed to obtain the relationship between the output response of the infrared detector and the calibration coefficient.

[0061] The infrared detector calibration method of the present invention ensures constant blackbody radiation energy by maintaining a constant blackbody temperature. By varying the amount of radiation incident on the infrared detector through a shielding device, the effect of the blackbody's constantly changing emitted energy on the blackbody's own emissivity is avoided. This prevents the influence of irregular variations in the blackbody radiation energy and emissivity on the detector calibration coefficient when the calibration coefficient is derived from them, thereby obtaining a stable detector calibration coefficient. Furthermore, because the blackbody temperature remains constant, its radiation energy remains stable. Therefore, during the calibration process, there is no need to wait for the blackbody radiation to stabilize after each temperature change, as in the prior art. This significantly shortens the calibration cycle and saves time.

[0062] Specifically, in step S1, in order to ensure the infrared detector's efficiency in receiving radiation energy, the axes of the blackbody light exit hole, the bracket of the shielding device and the detector window are aligned, that is, the axes of the blackbody light exit hole, the bracket of the shielding device and the detector window coincide; after the three axes are aligned, the above-mentioned devices can be fixed and installed.

[0063] In order to ensure that the shielding device effectively shields the blackbody radiation energy, the total area of ​​the four shielding members 3 of the shielding device is slightly larger than the area of ​​the blackbody light exit hole.

[0064] In step S2, only a calibration temperature needs to be set. During the entire calibration process, the blackbody maintains this temperature. Specifically, the set blackbody initial temperature T can ensure that the detector output voltage is the maximum or close to the maximum voltage response of the detector itself.

[0065] After waiting for the blackbody radiation to stabilize, the initial output response value V0 of the infrared detector can be measured;

[0066] During implementation, the output signal of the infrared detector is processed by the circuit signal to obtain an output response which is a voltage signal;

[0067] The infrared radiation corresponding to the initial output response value V0 of the infrared detector measured at this time is the initial infrared radiation L0. That is, at this time, the motor in the shielding device is not started, and the plane where each shielding member 3 is located is parallel to the infrared radiation emission direction. Therefore, the initial infrared radiation L0 is:

[0068] L0=T4 εσ

[0069] Where T is the blackbody temperature, ε is the blackbody emissivity, and σ is the Boltzmann constant.

[0070] The initial calibration coefficient R0 is:

[0071] R0=V0 / L0

[0072] In step S3, in order to obtain the calibration coefficient of the infrared detector under different infrared radiation energies, it is necessary to turn on the stepper motor so that the multiple shielding members 3 gradually rotate at the same speed to form different fan-shaped shielding areas, thereby causing the radiation energy reaching the infrared detector through the shielding device to change;

[0073] When a shielding member 3 rotates at an angle of θ0, the angle θ of the area projected on the surface perpendicular to the infrared emission direction is 阴影 The following relationship is satisfied:

[0074]

[0075] In order to facilitate the later data interpolation fitting, the infrared radiation energy is set to increase or decrease in the same step size; for example, the infrared radiation energy to be calibrated is set to L1, L2, ... L n ,in,

[0076] L i =L0-i·ΔL, where i=1,2,...,n, n is a natural number, and ΔL is the step size of infrared radiation energy change;

[0077] For example, ΔL can be set to mL0, m is a linearly increasing or decreasing series, the smaller the step size is, the higher the resolution is when calibrating the detector coefficient. It can be set according to actual needs during implementation. For example, m is wait;

[0078] Assume the rotational angular velocity of the driving motor 2 is ω,

[0079] Calculate the infrared radiation amount L according to the rotation angular velocity and infrared radiation amount i The corresponding rotation time T i When reaching T i When the motor stops rotating, the infrared detector output response value V is measured. i ;

[0080] Among them, T i It can be given by the following formula:

[0081]

[0082]

[0083] θ i =4ωT i ,

[0084] From the above formula we can get:

[0085]

[0086] The time T corresponding to the above different infrared radiation amounts i Stored in the controller, when the time T is reached i When the shielding area formed by the rotation of the shielding member makes the radiation energy incident on the infrared detector reach the set value, the controller controls the motor to stop running and measures the output response V of the infrared detector. i For each infrared radiation energy, the above operation is performed to obtain the corresponding output response V i ;

[0087] In step S4, according to formula R i =V i / L i , set the infrared radiation amount L i , and different infrared radiation amounts L i The corresponding infrared detector output response V i Substitute in and get the calibration coefficient R corresponding to different infrared radiation amounts i .

[0088] In step S5, the calibration coefficients R0, R i and the infrared detector output response V0, V i Perform interpolation fitting to obtain the relationship between the infrared detector output response and the calibration coefficient, as shown below: R = -0.1811V 1.243 +232.5.

[0089] After obtaining the above relationship, the nonlinearity calibration of the infrared detector is realized.

[0090] If the infrared detector is used for testing again in the future, if the detector output response value V is obtained, the corresponding calibration coefficient R can be calculated based on the output response value V and the above relationship. The accurate amount of infrared radiation can be inferred, and the corrected radiation energy can be used when calculating the emissivity of the material, which can avoid inaccurate emissivity when the energy received by the detector and the output voltage value are not in a linear relationship.

[0091] Example 3:

[0092] The embodiment of the present invention further provides a self-test method based on the infrared radiation shielding device in embodiment 1, the method comprising the following steps:

[0093] S10, aligning the axis of the shielding device's bracket directly with the blackbody light exit hole, and aligning the infrared detector window directly with the axis of the shielding device's bracket; and ensuring that the fan-shaped planes of the plurality of fan-shaped shielding sheets are perpendicular to the infrared radiation emission direction;

[0094] S20, set the calibration temperature of the black body, wait for the black body radiation to stabilize, open the first group of multiple groups of shielding angle adjustment components, so that the corresponding shielding member rotates by an angle θ 1 ; Get the output response value V of the infrared detector 1 ;

[0095] S30, return the shielding members in the first group of shielding member angle adjustment assemblies to their fan-shaped planes perpendicular to the infrared radiation emission direction; open the second group of the multiple groups of shielding member angle adjustment assemblies so that the corresponding shielding members rotate by an angle θ 2 ; Get the output response value V of the infrared detector 2 ;

[0096] S40, repeat the above operation to obtain the shielding member rotation angle θ of the corresponding area of ​​other different groups of shielding member angle adjustment components 3 ,θ 4 ...θ n After that, the output response value of the infrared detector V 3 、V 4 ...V n ; where θ 1 =θ 2 =θ 3 =θ 4 =θ n ;

[0097] S50, outputting the response values ​​V of the obtained multiple regions 1 、V 2 、V 3 、V 4 ...V n Compare the values. If the values ​​are equal or close, the infrared radiation shielding device is not faulty. If the values ​​differ greatly, the infrared radiation shielding device is faulty and needs to be calibrated.

[0098] S60, repeat the steps of S20-S50 to obtain multiple groups of four area output response values ​​V 1 、V 2 、V 3 、V 44 ...V n The average value is compared to improve the accuracy of self-test.

[0099] Those skilled in the art will appreciate that all or part of the process steps of the above-described embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, such as a magnetic disk, an optical disk, a read-only memory, or a random access memory.

[0100] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. An infrared radiation shielding device, characterized in that: It comprises a bracket (1), a plurality of shielding members (3) and a plurality of groups of shielding member angle adjustment components; the shielding member angle adjustment components are used to linearly adjust the rotation angle of the shielding member (3); The bracket (1) is a circular mounting frame, and a plurality of bearing mounting holes are provided in the circular mounting frame; the end face of the circular mounting frame provided with the bearing mounting hole area is provided with a movable loading and unloading block; the inner end face of the movable loading and unloading block is provided with a groove, and the groove constitutes a part of the bearing mounting hole, and the outer end face of the movable loading and unloading block can be locked with the end face of the circular mounting frame; the inner side wall of the circular mounting frame corresponding to the bearing mounting hole is provided with a circular slide groove, and the connecting member (6) is provided with a slip ring relative to one end of the inner side wall of the circular mounting frame, and the slip ring is slidably matched with the circular slide groove and can rotate circumferentially in the circular slide groove; the inner side wall of the movable loading and unloading block is also provided with a slide groove, and the slide groove is a part of the circular slide groove of the inner side wall of the circular mounting frame; The shielding member (3) is a fan-shaped shielding piece, the radius of the fan-shaped shielding piece is the same as the radius of the inner circle of the annular mounting frame, the central end of the fan-shaped shielding piece is provided with a taper, and the central ends of the fan-shaped shielding piece abut against each other through the taper; The shielding member angle adjustment assembly comprises a driving motor (2), a bearing (4), a coupling (5) and a connecting member (6); the driving motor (2) is connected to the bearing (4) via the coupling (5), and the connecting member (6) is fixedly connected to the axis center position of the bearing (4); the connecting member (6) is located inside the inner side wall of the circular ring mounting frame, and the middle position of the arc long side of the fan-shaped shielding piece is fixedly connected to the connecting member (6); the bearing (4) is located in the bearing mounting hole, and the driving motor (2) and the coupling (5) are located outside the outer side wall of the circular ring mounting frame.

2. The infrared radiation shielding device according to claim 1, characterized in that: The connecting member (6) is columnar, and is provided with a mounting groove along the axial direction. The shielding member (3) is inserted into the mounting groove and connected to the connecting member (6).

3. The infrared radiation shielding device according to claim 2, characterized in that: Two adjacent bearing mounting holes are circumferentially arranged in the annular mounting frame at an angle of 90 degrees therebetween.

4. The infrared radiation shielding device according to claim 3, characterized in that: A protective shell is also provided on the outer side wall of the circular mounting frame at a position corresponding to the bearing mounting hole.

5. The infrared radiation shielding device according to claim 4, characterized in that: The coupling (5) is arranged in the protective shell.

6. A method for calibrating an infrared detector based on the shielding device according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: Align the axis of the shielding device's bracket with the blackbody's light-emitting hole, and align the infrared detector window with the axis of the shielding device's bracket; ensure that the plane where the multiple shielding components are located is parallel to the infrared radiation emission direction; Set the blackbody calibration temperature, wait for the blackbody radiation to stabilize, obtain the initial infrared radiation L0 and the initial output response value V0 of the infrared detector; calculate the initial calibration coefficient R0 based on the initial infrared radiation L0 and the initial output response value V0 of the infrared detector; Start the stepper motor to make multiple shielding parts rotate gradually at the same speed to form different fan-shaped shielding areas. Infrared radiation is emitted from the fan-shaped penetration surface that is not blocked by the shielding parts, and the infrared detector receives different infrared radiation amounts L i Irradiation, obtain different infrared radiation amounts L i When irradiated, the infrared detector outputs a response of V i ; According to the above different infrared radiation amounts L i , and different infrared radiation amounts L i The corresponding infrared detector output response value V i Calculate different infrared radiation amounts L i Corresponding calibration coefficient R i ; The calibration coefficients R0, R i And the infrared detector output response value V0, V i Interpolation fitting is performed to obtain the relationship between the infrared detector output response value V and the calibration coefficient R.

7. A self-test method based on the shielding device according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: Align the axis of the shielding device's bracket with the blackbody's light-emitting hole, and align the infrared detector window with the axis of the shielding device's bracket; ensure that the plane where the multiple sector-shaped shielding elements are located is perpendicular to the infrared radiation emission direction; Set the calibration temperature of the blackbody, wait for the blackbody radiation to stabilize, open the first group of multiple sets of shielding angle adjustment components, and rotate the corresponding shielding element θ 1 ; Get the output response value V of the infrared detector 1 ; Return the shielding members in the first set of shielding member angle adjustment assemblies to a plane perpendicular to the infrared radiation emission direction; open the second set of multiple shielding member angle adjustment assemblies, so that the corresponding shielding members rotate θ 2 ; Get the output response value V of the infrared detector 2 ; Repeat the above steps to obtain the shielding member rotation θ of the corresponding area of ​​other different groups of shielding member angle adjustment components n After that, the output response value of the infrared detector V n ; where θ 1 =θ 2 =θ n ; The obtained multiple regions output response values ​​V 1 、V 2 、V n Comparison is performed. If the obtained values ​​are equal or similar, the infrared radiation shielding device is not faulty. If the obtained values ​​differ greatly, the infrared radiation shielding device is faulty and needs to be calibrated.

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