A dual optical path split type continuous zoom infrared thermal imager calibration method

Abstract

The application provides a kind of dual optical path split type continuous zoom infrared thermal imager adjustment method, which belongs to the technical field of precise optical instrument adjustment, the adjustment method first takes the reference surface at the front end of the base of fixed focal length optical path as the total reference for adjustment, carries out imaging adjustment of fixed focal length optical path, then carries out imaging adjustment of continuous zoom optical path, adjusts in the order of parfocal adjustment, optical axis consistency adjustment, optical axis and detector center position adjustment, to complete the imaging adjustment of dual optical path split type continuous zoom infrared thermal imager. By using this method, the difficulty of adjusting the dual optical path split type continuous zoom infrared thermal imager is effectively reduced, the repeated adjustment process is reduced, and the imaging adjustment efficiency and quality of the dual optical path split type continuous zoom infrared thermal imager are improved.

Description

Technical Field

[0001] This invention relates to the field of precision optical instrument assembly and adjustment technology, and in particular provides a method for adjusting a dual-optical-path split-type continuous zoom infrared thermal imager. Background Technology

[0002] The dual-path split-type continuous zoom infrared thermal imager is the latest development in continuous zoom infrared thermal imagers, such as... Figure 3 As shown, it includes a fixed-focal-length optical path and a continuously zoom optical path. The two optical paths share a common set of converging mirrors and a detector, and are switched via a rotating mirror. The mounting bases for the two optical paths are arranged at 90°. This configuration of infrared thermal imager combines a large zoom ratio with an ultra-small field of view, offering advantages such as good observation and tracking performance, compact structure, and low cost. However, due to its special configuration, assembly and adjustment are quite difficult, and a perfect assembly and adjustment method is still lacking. Summary of the Invention

[0003] The purpose of this application is to solve the problem of imaging calibration method for dual-path split-type continuous zoom infrared thermal imagers, to solidify the imaging calibration process route for dual-path split-type continuous zoom infrared thermal imagers, and to ensure the technical indicators such as image quality, optical axis consistency, and parfocality of dual-path split-type continuous zoom infrared thermal imagers.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A calibration method for a dual-path split-type continuous zoom infrared thermal imager is disclosed. The dual-path split-type continuous zoom infrared thermal imager includes a fixed-focal-length optical path, a continuous zoom optical path, and a rotating mirror for switching optical paths, all arranged at 90° to a mounting base. The fixed-focal-length optical path and the continuous zoom optical path share a converging lens group and a detector. The fixed-focal-length optical path further includes a first focusing lens group. The continuous zoom optical path includes a large objective lens group, a zoom lens group, a compensation lens group, a second focusing lens group, and a fixed lens group arranged sequentially along the optical path direction.

[0006] The method includes:

[0007] S1: Place the first reticle on the overlapping light path of the fixed focal length optical path and the continuous zoom optical path, place the inner focusing tube directly in front of the overlapping light path, adjust the position of the inner focusing tube so that the first reticle and the inner focusing tube are aligned, and establish the through-axis adjustment reference for the rotating mirror.

[0008] S2: Place the second and third reticles on the light paths of the two optical paths in front of the rotating mirror, respectively. By adjusting the position of the rotating mirror and the height of the limiting post, make the reticle image and collimated image of the two optical paths coincide with the rotating mirror through-axis calibration reference established in S1.

[0009] S3: Install the converging lens group, the first focusing lens group, the large objective lens group, the zoom lens group, the compensating lens group, the second focusing lens group, and the fixed lens group to obtain the initial optical system of the dual-path split-type continuous zoom infrared thermal imager.

[0010] S4: Place a collimator directly in front of the light path of the fixed focal length optical path. Using the reference surface at the front end of the base of the fixed focal length optical path as the overall reference for assembly, adjust the position of the initial optical system so that the reference surface at the front end of the base of the fixed focal length optical path is aligned with the collimator. Install the detector, adjust the position of the first focusing lens group to make the image clear, and then adjust the position of the detector so that the center of the detector is aligned with the optical axis of the initial optical system.

[0011] S5: Perform field-of-view and uniformity tests on the fixed focal length optical path. If the requirements are met, proceed to S6; otherwise, return to S3 to adjust the converging lens group and the first focusing lens group.

[0012] S6: Perform continuous zoom optical path parfocality adjustment and test the maximum and minimum field of view of the continuous zoom optical path. If the requirements are met, proceed to S7. If not, return to S3 to adjust the large objective lens group, zoom lens group, compensating lens group, second focusing lens group, and fixed lens group.

[0013] S7: Perform continuous zoom optical path optical axis consistency adjustment;

[0014] S8: Adjust the position of the optical axis of the infrared thermal imager and the center position of the detector in the continuous zoom optical path, and test the adjustment result. If the requirements are met, the adjustment of the dual-optical-path split continuous zoom infrared thermal imager is completed.

[0015] The dual-path split-type continuous zoom infrared thermal imager calibration method provided by the present invention also has the following features: adjusting the position of the rotating mirror in step S2 includes adjusting the height of the rotating mirror by placing an adjusting shim under the mirror mount of the rotating mirror and adjusting the horizontal position of the rotating mirror by translating the rotating mirror.

[0016] The dual-optical-path split-type continuous zoom infrared thermal imager calibration method provided by the present invention also has the following feature: the detector installation in step S4 includes installing the detector at the back intercept position of the initial optical system by means of a positioning pin.

[0017] The dual-optical-path split-type continuous zoom infrared thermal imager calibration method provided by this invention also has the following feature: the field-of-view range test and uniformity test of the fixed focal length optical path include:

[0018] Test the field of view of a fixed-focal-length optical path infrared thermal imager;

[0019] By observing the target point of the collimator through a fixed focal length optical path, observe whether the target point diffuses uniformly in a circular ring during the movement of the first focusing lens group within the focusing range.

[0020] By observing a blackbody placed directly in front of the aperture of a fixed-focus optical path, observe whether the image of the blackbody remains consistent as the first focusing lens group moves within the focusing range.

[0021] If the field of view of the fixed-focal-length optical path infrared thermal imager meets the requirements, the target points are uniformly diffused in a circular pattern, and the image of the blackbody is consistent, then the test requirements are met.

[0022] The dual-optical-path split-type continuous zoom infrared thermal imager calibration method provided by this invention also has the following feature: the continuous zoom optical path parfocality calibration includes:

[0023] By adjusting the front and rear positions of the second focusing lens group, the maximum field of view of the continuous zoom optical path can be clearly imaged.

[0024] To keep the position of the second focusing lens group fixed;

[0025] By adjusting the front and rear positions of the large objective lens group, the minimum field of view imaging of the infrared thermal imager with continuous zoom optical path can be made clear.

[0026] The dual-optical-path split-type continuous zoom infrared thermal imager calibration method provided by the present invention also has the following feature: the continuous zoom optical path optical axis consistency calibration includes: taking the imaging position of the target point in the large field of view as a reference, and finely adjusting the overall angle of the components constituting the continuous zoom optical path in the initial optical system to make the optical axis of the large field of view consistent with that of the small field of view.

[0027] The dual-optical-path split-type continuous zoom infrared thermal imager calibration method provided by the present invention also has the following feature: the calibration of the position of the infrared thermal imager optical axis and the detector center of the continuous zoom optical path includes shifting the front-back and up-down positions of the continuous zoom optical path lens to align the detector center with the optical axis.

[0028] The dual-optical-path split-type continuous zoom infrared thermal imager calibration method provided by this invention also has the following feature: The testing of the calibration result in step S8 includes:

[0029] Observe the target point of the collimator through the continuous zoom optical path, and observe whether the target point diffuses in a uniform ring during the movement of the second focusing lens group within the focusing range.

[0030] Observe the blackbody using a continuous zoom optical path, and observe whether the image of the blackbody remains consistent as the second focusing lens group moves within the focusing range.

[0031] If the target points are evenly diffused in a circular pattern and the blackbody image is consistent, then the requirements are met.

[0032] The dual-optical-path split-type continuous zoom infrared thermal imager calibration method provided by the present invention also has the following feature: the calibration method further includes fixing the fixed focal length optical path, the continuous zoom optical path, the rotating reflector, the converging mirror group, and the detector by applying adhesive to fastening screws.

[0033] Beneficial effects

[0034] The calibration method provided by this invention clarifies the calibration benchmark, calibration sequence, and calibration method for a dual-path split-type continuous zoom infrared thermal imager. It achieves imaging calibration of the dual-path split-type continuous zoom infrared thermal imager. Using this method, the calibration difficulty of the dual-path split-type continuous zoom infrared thermal imager is effectively reduced, the repetitive assembly and calibration process is decreased, and the imaging calibration efficiency and quality of the dual-path split-type continuous zoom infrared thermal imager are improved. It ensures that the angular deviation of the fixed focal length optical path is ≤30″ and the angular deviation of the continuous zoom optical path is ≤1′, effectively solving the imaging calibration problem of the dual-path split-type continuous zoom infrared thermal imager. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram illustrating the calibration method provided in this application;

[0037] Figure 2 A schematic diagram showing the positions of the reticle and the internal focusing tube in the calibration method provided in this application;

[0038] Figure 3 This is a schematic diagram of the dual-optical-path split-type continuous zoom infrared thermal imager involved in this application.

[0039] Figure 4 This is a cross-sectional view of the dual-optical-path split-type continuous zoom infrared thermal imager involved in this application.

[0040] Figure 5 This is a cross-sectional view of the continuous zoom optical path portion of the dual-optical-path split-type continuous zoom infrared thermal imager involved in this application.

[0041] Among them, 1. Continuous zoom optical path, 2. Fixed focal length optical path, 3. Detector, 4. Converging lens group, 5. Rotating mirror, 6. First focusing lens group, 7. Large objective lens group, 8. Zoom lens group, 9. Compensating lens group, 10. Second focusing lens group, 11. Fixed lens group, 12. Limiting post, 13. Positioning pin, 14. First reticle, 15. Second reticle, 16. Third reticle, 17. Internal focusing light tube, 18. Base front reference surface, 19. Collimator, 20. Two-dimensional turntable, 21. Adjustment fixture, 22. Blackbody, 23. Rotating mirror mount, 24. Adjustment shim. Detailed Implementation

[0042] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be noted that these embodiments are not intended to limit the present application. Equivalent transformations or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the protection scope of the present application.

[0043] In the description of the embodiments of this application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the creation of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the creation of this application.

[0044] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0045] The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0046] like Figure 1-5As shown, the dual-path split-type continuous zoom infrared thermal imager includes a fixed-focal-length optical path 2, a continuous zoom optical path 1, and a rotating mirror 5 for switching optical paths, all arranged at 90° on the mounting base. The fixed-focal-length optical path 2 and the continuous zoom optical path 1 share a converging lens group 4 and a detector 3. The fixed-focal-length optical path 2 also includes a first focusing lens group 6. The continuous zoom optical path 1 includes a large objective lens group 7, a zoom lens group 8, a compensating lens group 9, a second focusing lens group 10, and a fixed lens group 11 arranged sequentially along the optical path direction. The dual-path split-type continuous zoom infrared thermal imager switches optical paths through the rotating mirror 5. The rotating mirror 5 is the connecting node between the two optical paths; therefore, the installation and adjustment accuracy of the rotating mirror 5 determines the imaging quality and optical axis accuracy of the two optical paths. To ensure the installation and adjustment accuracy of the rotating mirror 5, a reference reticle is placed at the mounting hole of the converging lens group 4 shared by the two optical paths to establish the installation and adjustment reference for the rotating mirror. Then, a reticle is placed on each of the light paths of the rotating mirror 5 and the two optical paths to adjust the position of the rotating mirror 5. Since the optical path at the front end of the rotating mirror 5 can be translated to compensate for the positional deviation of the rotating mirror 5, it is crucial to ensure the angular adjustment accuracy of the rotating mirror 5 for the two optical paths, ensuring that the angular deviation of the fixed focal length optical path 2 is ≤30″ and the angular deviation of the continuous zoom optical path 1 is ≤1′ (also known as alignment).

[0047] This application provides a calibration method for a dual-optical-path split-type continuous zoom infrared thermal imager, the method comprising:

[0048] S1: Place the first reticle 14 on the overlapping light path of the fixed focal length optical path 2 and the continuous zoom optical path 1, and place the inner focusing light tube 17 directly in front of the overlapping light path. Adjust the position of the inner focusing light tube 17 so that the first reticle 14 and the inner focusing light tube 17 are aligned, and establish the through-axis adjustment reference of the rotating mirror 5.

[0049] S2: Place the second reticle 15 and the third reticle 16 on the light paths of the two optical paths in front of the rotating mirror 5, respectively. By adjusting the position of the rotating mirror 5 and the height of the limiting post 12, make the reticle image and collimated image of the two optical paths coincide with the rotating mirror through-axis adjustment reference established in S1, and ensure that the angle deviation of the fixed focal length optical path 2 is ≤30″ and the center deviation is ≤0.05mm, and the angle deviation of the continuous zoom optical path 1 is ≤1′ and the center deviation is ≤0.05mm.

[0050] S3: Install the converging lens group 4, the first focusing lens group 6, the large objective lens group 7, the zoom lens group 8, the compensating lens group 9, the second focusing lens group 10, and the fixed lens group 11 to obtain the initial optical system of the dual-path split-type continuous zoom infrared thermal imager.

[0051] S4: Place the collimator 19 directly in front of the light path of the fixed focal length optical path 2. Using the reference surface 18 at the front end of the base of the fixed focal length optical path 2 as the overall reference for assembly and adjustment, adjust the position of the initial optical system so that the reference surface 18 at the front end of the base of the fixed focal length optical path 2 is collimated with the collimator 10. Install the detector 3, adjust the position of the first focusing lens group 6 to make the image clear, and then adjust the position of the detector 3 so that the center of the detector 3 is aligned with the optical axis of the initial optical system. After the adjustment is completed, the position of the detector 3 is fixed.

[0052] S5: Perform field of view and uniformity tests on fixed focal length optical path 2. If the requirements are met, proceed to S6; otherwise, return to S3 to adjust the converging lens group and the first focusing lens group.

[0053] S6: Perform parfocal calibration of continuous zoom optical path 1, and test the maximum and minimum field of view of continuous zoom optical path 1. If the requirements are met, proceed to S7. If not, return to S3 to adjust the large objective lens group 7, zoom lens group 8, compensating lens group 9, second focusing lens group 10, and fixed lens group 11. When returning to S3 for adjustment, you can adjust each lens group itself, the distance between each lens group, or all of them.

[0054] S7: Perform continuous zoom optical path 1 optical axis consistency adjustment;

[0055] S8: Adjust the position of the infrared thermal imager optical axis and the center position of the detector 3 in the continuous zoom optical path 1, and test the adjustment result. If the requirements are met, the adjustment of the dual-optical-path split continuous zoom infrared thermal imager is completed.

[0056] In some embodiments, adjusting the position of the rotating mirror 5 in S2 includes adjusting the height of the rotating mirror 5 by placing an adjusting shim 24 under the rotating mirror mount 23 and adjusting the horizontal position of the rotating mirror 5 by translating the rotating mirror 5.

[0057] In some embodiments, installing the detector 3 in S4 includes installing the detector 3 at the back cutoff position of the initial optical system using a positioning pin.

[0058] In some embodiments, the field-of-view range test and uniformity test of the fixed focal length optical path 2 include:

[0059] Test the field of view of the fixed-focus optical path 2 infrared thermal imager;

[0060] By observing the parallel light tube target point through the fixed focal length optical path 2, observe whether the target point is uniformly diffused in a circular ring during the movement of the first focusing lens group 6 within the focusing range.

[0061] By observing the blackbody 22 placed directly in front of the light-passing aperture of the fixed-focus optical path 2 through the fixed-focus optical path 2, observe whether the image of the blackbody 22 remains consistent as the first focusing lens group 6 moves within the focusing range.

[0062] If the field of view of the fixed focal length optical path 2 infrared thermal imager meets the requirements, the target points are uniformly diffused in a circular pattern, and the image of the blackbody 22 is consistent, then the test requirements are met.

[0063] In some embodiments, the process of performing parfocal adjustment of the continuous zoom optical path 1 includes:

[0064] By adjusting the front and rear positions of the second focusing lens group 10, the maximum field of view of the continuous zoom optical path 1 is made clear.

[0065] The position of the second focusing lens group 10 is fixed.

[0066] By adjusting the front and rear positions of the large objective lens group 7, the minimum field of view imaging of the infrared thermal imager in the continuous zoom optical path 1 is made clear.

[0067] In some embodiments, the optical axis consistency adjustment of the continuous zoom optical path 1 includes: using the imaging position of the target point in the large field of view as a reference, fine-tuning the overall angle of the components constituting the continuous zoom optical path 1 in the initial optical system to make the optical axes of the large field of view and the small field of view consistent. The components constituting the continuous zoom optical path in the initial optical system can be fixed as a whole on the two-dimensional turntable 20, and the adjustment can be made by fine-tuning the angle of the two-dimensional turntable 20.

[0068] In some embodiments, the adjustment of the optical axis of the infrared thermal imager and the center position of the detector 3 in the continuous zoom optical path 1 includes shifting the front-back and up-down positions of the continuous zoom optical path lens to align the center of the detector 3 with the optical axis.

[0069] In some embodiments, S8, which involves testing the calibration results, includes:

[0070] Observe the target point of the collimator in the continuous zoom optical path 1, and observe whether the target point is uniformly diffused in a circular ring during the movement of the second focusing lens group 10 within the focusing range.

[0071] Observe the blackbody 22 through the continuous zoom optical path 1. Observe whether the image of the blackbody 22 remains consistent as the second focusing lens group 10 moves within the focusing range.

[0072] If the target points are evenly diffused in a circular pattern and the image of the blackbody 22 is consistent, then the requirements are met.

[0073] In some embodiments, the calibration method further includes fixing the fixed focal length optical path 2, the continuous zoom optical path 1, the rotating reflector 5, the converging mirror group 4, and the detector 3 by applying adhesive to fastening screws.

[0074] The principle behind the calibration method provided by any of the foregoing items is as follows:

[0075] Since the fixed-focus optical path 2 and the continuous zoom optical path 1 share a set of converging mirror group 4 and detector 3, and the shared converging mirror group 4 and detector 3 are mounted on the base of the fixed-focus optical path 1, it is necessary to first adjust the fixed-focus optical path 1 and then adjust the continuous zoom optical path 2.

[0076] When calibrating the fixed focal length optical path 2, the front reference surface 18 of the base is used as the overall calibrator. The detector 3 is installed at the theoretical back intercept position by positioning pins. The front and rear positions of the first focusing lens group 6 are adjusted to make the image clearest. Then, the left and right and up and down positions of the detector 3 are translated to align the center of the detector 3 with the optical axis with a deviation of ≤1 pixel. After calibration in this way, it can be ensured that the optical axis is perpendicular to the front reference surface 18 of the base, and all the indicators of the fixed focal length optical path 2 meet the requirements.

[0077] During the imaging calibration of continuous zoom optical path 1, the first step is to calibrate the parfocality of the continuous zoom system to ensure correct spacing between lenses. This is verified by testing the field of view to ensure both parfocality and field of view are acceptable; this forms the basis for subsequent calibrations. Next, the optical axis consistency of the continuous zoom system is fine-tuned. Optical axis consistency is primarily ensured through the optical system's cross-axis method. However, due to errors in each cross-axis step, cross-axis alignment cannot completely guarantee the requirement of ≤1 pixel consistency between the large and small field of view. Therefore, further fine-tuning of optical axis consistency is necessary during imaging calibration. Because the focal length difference between the large and small field of view is significant, the angle of the incident light has a different impact on its imaging position on the detector target surface—a greater impact on the small field of view and a smaller impact on the large field of view. Based on this principle, the optical axis consistency is fine-tuned by adjusting the angle of the incident light to ensure that the optical axis consistency meets the requirement of ≤1 pixel. Finally, the optical axis and detector center position are calibrated. Since the position of detector 3 was determined during the calibration of fixed focal length optical path 2, it is impossible to further adjust the detector position to ensure that the optical axis center of the continuous zoom optical path is aligned with the detector center. Through optical simulation analysis, by shifting the vertical and horizontal positions of the infrared thermal imager in the continuous zoom optical path, it is possible to adjust and ensure that the optical axis center of the continuous zoom optical path is aligned with the detector center, with a deviation of ≤1 pixel.

[0078] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above description is merely a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A method for calibrating a dual optical path split type continuous zoom infrared thermal imager, the dual optical path split type continuous zoom infrared thermal imager comprising a fixed focal length optical path, a continuous zoom optical path and a rotating mirror for switching optical paths arranged at 90° with a mounting base, the fixed focal length optical path and the continuous zoom optical path sharing a set of converging lens groups and a detector, wherein the fixed focal length optical path further comprises a first focusing lens group; the continuous zoom optical path comprises, in sequence along the optical path direction, an objective lens group, a zoom lens group, a compensation lens group, a second focusing lens group and a fixed lens group, the method comprising: S1: placing a first reticle on the coincident light path of the fixed focal length optical path and the continuous zoom optical path, placing an inner focusing light tube in front of the coincident light path, adjusting the position of the inner focusing light tube to make the first reticle collimate with the inner focusing light tube, and establishing a rotating mirror through-axis calibration reference; S2: placing a second reticle and a third reticle on the light paths of the two optical paths in front of the rotating mirror respectively, adjusting the position of the rotating mirror and the height of the limiting column to make the reticle images and collimated images of the two optical paths coincide with the rotating mirror through-axis calibration reference established in S1; S3: installing the converging lens group, the first focusing lens group, the objective lens group, the zoom lens group, the compensation lens group, the second focusing lens group and the fixed lens group to obtain an initial optical system of the dual optical path split type continuous zoom infrared thermal imager; S4: placing a collimator in front of the coincident light path of the fixed focal length optical path, taking the front end reference surface of the base of the fixed focal length optical path as the total calibration reference, adjusting the position of the initial optical system to make the front end reference surface of the base of the fixed focal length optical path collimate with the collimator, installing the detector, adjusting the position of the first focusing lens group to make the image clear, and then adjusting the position of the detector to make the center of the detector align with the optical axis of the initial optical system; S5: testing the field of view range and uniformity of the fixed focal length optical path, if the requirements are met, then performing S6, if not, returning to S3 to adjust the converging lens group and the first focusing lens group; S6: performing parfocal adjustment of the continuous zoom optical path, and testing the maximum field of view range and the minimum field of view range of the continuous zoom optical path, if the requirements are met, then performing S7, if not, returning to S3 to adjust the objective lens group, the zoom lens group, the compensation lens group, the second focusing lens group and the fixed lens group; S7: performing optical axis consistency adjustment of the continuous zoom optical path; S8: performing infrared thermal imager optical axis and detector center position adjustment of the continuous zoom optical path, and testing the adjustment result, if the requirements are met, then completing the calibration of the dual optical path split type continuous zoom infrared thermal imager, the testing the field of view range and uniformity of the fixed focal length optical path comprising: testing the field of view range of the infrared thermal imager of the fixed focal length optical path; observing the target point of the collimator through the fixed focal length optical path, and observing whether the target point presents uniform circular diffusion during the movement of the first focusing lens group within the focusing range; observing the black body placed in front of the light path aperture of the fixed focal length optical path through the fixed focal length optical path, and observing whether the picture of the black body is consistent during the movement of the first focusing lens group within the focusing range. characterized in that ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ If the field of view range of the fixed focal length optical path infrared thermal imager meets the requirements, the target points are uniformly diffused in a circle, and the black body picture is consistent, the test requirements are met.

2. The dual optical path split continuous zoom thermal camera alignment method of claim 1, wherein, The adjusting the position of the rotating mirror in S2 includes adjusting the height position of the rotating mirror by adjusting the gasket under the mirror seat of the rotating mirror, and adjusting the horizontal position of the rotating mirror by translating the rotating mirror.

3. The dual optical path split continuous zoom thermal camera alignment method of claim 1, wherein, The mounting the detector in S4 includes mounting the detector at the back intercept position of the initial optical system by positioning the pin.

4. The dual optical path split continuous zoom thermal camera alignment method of claim 1, wherein, The continuous zoom optical path focusing property adjustment includes: clearly imaging the maximum field of view of the continuous zoom optical path by adjusting the front and back positions of the second focusing lens group; fixing the position of the second focusing lens group; clearly imaging the minimum field of view of the infrared thermal imager of the continuous zoom optical path by adjusting the front and back positions of the large objective lens group.

5. The dual optical path split continuous zoom thermal camera alignment method of claim 1, wherein, The continuous zoom optical path optical axis consistency adjustment includes: taking the imaging position of the target points in the large field of view as the reference, adjusting the overall angle of the elements in the initial optical system that constitute the continuous zoom optical path by fine tuning, so that the optical axes of the large field of view and the small field of view are consistent.

6. The dual optical path split continuous zoom thermal camera alignment method of claim 1, wherein, The infrared thermal imager optical axis and detector center position adjustment of the continuous zoom optical path includes translating the front and back and up and down positions of the continuous zoom optical path lens, so that the detector center and the optical axis are aligned.

7. The dual optical path split continuous zoom thermal camera alignment method of claim 1, wherein, The testing the adjustment results in S8 includes: observing the target points of the parallel light tube of the continuous zoom optical path, and observing whether the target points are uniformly diffused in a circle during the movement of the second focusing lens group in the focusing range; observing the black body of the continuous zoom optical path, and observing whether the picture of the black body is consistent during the movement of the second focusing lens group in the focusing range, if the target points are uniformly diffused in a circle and the picture of the black body is consistent, the requirements are met.

8. The dual optical path split continuous zoom thermal camera alignment method of claim 1, wherein, The adjustment method further includes fixing the fixed focal length optical path, the continuous zoom optical path, the rotating mirror, the converging lens group and the detector by fastening the screws and dispensing.

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