Method for adjusting double-optical-path split type continuous zooming thermal infrared imager

Abstract

The invention provides a double-optical-path split type continuous zooming thermal infrared imager adjustment method, and belongs to the technical field of precision optical instrument adjustment, and the adjustment method comprises the steps: taking a base front end reference surface of a fixed focal length optical path as a total adjustment reference, carrying out the imaging adjustment of the fixed focal length optical path, and then carrying out the imaging adjustment of a continuous zooming optical path, and adjustment is carried out according to the sequence of parfocal adjustment, optical axis consistency adjustment and optical axis and detector center position adjustment, so that imaging adjustment of the double-optical-path split type continuous zooming thermal infrared imager is completed. By adopting the method, the adjustment difficulty of the double-optical-path split type continuous zooming thermal infrared imager is effectively reduced, the repetition of the installation and adjustment process is reduced, and the imaging adjustment efficiency and quality of the double-optical-path split type continuous zooming thermal infrared imager are improved.

Description

Technical Field

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

[0002] The dual-optical path split continuous zoom infrared thermal imager is the latest development of continuous zoom infrared thermal imager. Figure 3 As shown in the figure, it includes a fixed focal length optical path and a continuous zoom optical path. The two optical paths share a set of convergence lenses and detectors. The optical paths are switched by a rotating reflector. The mounting bases of the two optical paths are arranged at 90°. The infrared thermal imager of this configuration has the characteristics of large zoom ratio and ultra-small field of view, and has the advantages of good observation and tracking effect, compact structure, and low cost. However, due to its special configuration, it is difficult to assemble and adjust, and there is no perfect assembly and adjustment method. Summary of the invention

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

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A dual-optical path split continuous zoom infrared thermal imager calibration method, the dual-optical path split continuous zoom infrared thermal imager comprises a fixed focal length optical path, a continuous zoom optical path and a rotating reflector for switching the optical path arranged at 90 degrees on a mounting base, the fixed focal length optical path and the continuous zoom optical path share a group of convergence lens groups and detectors, wherein the fixed focal length optical path also includes a first focusing lens group; the continuous zoom optical path includes a large objective lens group, a variable magnification lens group, a compensation lens group, a second focusing lens group and a fixed lens group arranged in sequence along the optical path direction,

[0006] The method comprises:

[0007] S1: Place the first graticule on the overlapping light path of the fixed focal length optical path and the continuous zoom optical path, place the inner focusing light tube just in front of the overlapping light path, adjust the position of the inner focusing light tube, align the first graticule with the inner focusing light tube, and establish the through-axis adjustment reference of the rotating reflector;

[0008] S2: Place the second graticule and the third graticule on the light paths of the two light paths in front of the rotating reflector, respectively. Adjust the position of the rotating reflector and the height of the limit column to make the graticule images and collimated images of the two light paths coincide with the rotating reflector through-axis adjustment 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-optical path split continuous zoom infrared thermal imager;

[0010] S4: placing a collimator in front of the light path of the fixed focal length optical path, taking the front end reference plane of the base of the fixed focal length optical path as the total reference for installation and adjustment, adjusting the position of the initial optical system so that the front end reference plane of the base of the fixed focal length optical path is aligned 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 so that the center of the detector is aligned with the optical axis of the initial optical system;

[0011] S5: Perform a field of view range test and a uniformity test on the fixed focal length optical path. If the requirements are met, proceed to S6. If not, return to S3 to adjust the converging lens group and the first focusing lens group:

[0012] S6: Perform a parfocality adjustment on the continuous zoom optical path, and test the maximum field of view range and the minimum field of view range 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, the zoom lens group, the compensation lens group, the second focusing lens group, and the fixed lens group.

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

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

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

[0016] The dual-light-path split-type continuous-zoom infrared thermal imager calibration method provided by the present invention also has the following feature: the detector installation in 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 continuous zoom infrared thermal imager calibration method provided by the present invention also has the following characteristics: the field of view range test and uniformity test of the fixed focal length optical path include:

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

[0019] Observe the collimator target through a fixed focal length optical path to see whether the target is evenly diffused in a circular shape during the movement of the first focusing lens group within the focusing range;

[0020] Observe the black body placed in front of the fixed focal length optical path through the fixed focal length optical path, and observe whether the image of the black body is consistent during the movement of the first focusing lens group within the focusing range.

[0021] If the field of view of the fixed-focus optical path infrared thermal imager meets the requirements, the target points are evenly diffused in a circular ring, and the black body image is consistent, then the test requirements are met.

[0022] The dual-optical path split continuous zoom infrared thermal imager calibration method provided by the present invention also has the following characteristics: the continuous zoom optical path parfocality calibration comprises:

[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 is imaged clearly;

[0024] The position of the second focusing lens group is fixed;

[0025] The minimum field of view of the infrared thermal imager with a continuous zoom optical path can be imaged clearly by adjusting the front and rear positions of the large objective lens group.

[0026] The dual-optical path split-type continuous zoom infrared thermal imager calibration method provided by the present invention also has the following characteristics: the continuous zoom optical path optical axis consistency calibration comprises: taking the imaging position of the target point in the large field of view as a reference, by fine-tuning the overall angle of the elements constituting the continuous zoom optical path in the initial optical system, so that the optical axes of the large field of view and the small field of view are consistent.

[0027] The dual-optical path split continuous zoom infrared thermal imager calibration method provided by the present invention also has the following characteristics: the calibration of the infrared thermal imager optical axis and the detector center position of the continuous zoom optical path includes translating the front and back and up and 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 the present invention also has the following characteristics: the calibration result is tested in S8, including:

[0029] Observe the collimator target point through the continuous zoom optical path, and observe whether the target point spreads evenly in a circular shape during the movement of the second focusing lens group within the focusing range;

[0030] Observe the black body through the continuous zoom optical path, observe the movement of the second focusing lens group within the focusing range, and observe whether the image of the black body is consistent.

[0031] If the target points are evenly spread out in a circular shape and the black body image is consistent, the requirements are met.

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

[0033] Beneficial Effects

[0034] The calibration method provided by the present invention clarifies the calibration benchmark, index calibration sequence, and index calibration method of the dual-path split continuous zoom infrared thermal imager, realizes the imaging calibration of the dual-path split continuous zoom infrared thermal imager, and adopts the method to effectively reduce the calibration difficulty of the dual-path split continuous zoom infrared thermal imager, reduce the repetition of the installation and adjustment process, improve the imaging calibration efficiency and quality of the dual-path split continuous zoom infrared thermal imager, ensure that the angle deviation of the fixed focal length optical path is ≤30″, and the angle deviation of the continuous zoom optical path is ≤1′, and effectively solves the imaging calibration problem of the dual-path split continuous zoom infrared thermal imager. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A working diagram of the calibration method provided in this application;

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

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

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

[0040] Figure 5 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 reflector, 6. first focusing lens group, 7. large objective lens group, 8. zoom lens group, 9. compensation lens group, 10. second focusing lens group, 11. fixed lens group, 12. limit column, 13. positioning pin, 14. first graticule, 15. second graticule, 16. third graticule, 17. internal focusing light tube, 18. front end reference surface of base, 19. parallel light tube, 20. two-dimensional turntable, 21. debugging tooling, 22. black body, 23. rotating reflector seat, 24. adjusting gasket. DETAILED DESCRIPTION

[0042] The present application is further described in detail below in conjunction with the accompanying drawings and examples, but it should be noted that these implementation methods are not limitations of the present application, and equivalent changes or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these implementation methods are all within the scope of protection of the present application.

[0043] In the description of the embodiments of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the creation of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the creation of the present application.

[0044] In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0045] The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention of this application can be understood by specific circumstances.

[0046] like Figure 1-5As shown, the dual-path split continuous zoom infrared thermal imager includes a fixed focal length optical path 2, a continuous zoom optical path 1, and a rotating reflector 5 for switching optical paths, which are arranged at 90 degrees on the mounting base. The fixed focal length optical path 2 and the continuous zoom optical path 1 share a group of convergence lenses 4 and a detector 3, wherein 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 magnification lens group 8, a compensation lens group 9, a second focusing lens group 10, and a fixed lens group 11 arranged in sequence along the optical path direction. The dual-path split continuous zoom infrared thermal imager switches the optical paths through the rotating reflector 5, which is the connecting node of the two optical paths. Therefore, the installation and adjustment accuracy of the rotating reflector 5 determines the imaging quality and optical axis accuracy of the two optical paths. In order to ensure the adjustment accuracy of the rotating reflector 5, a reference graticule is placed at the mounting hole of the converging mirror group 4 shared by the two optical paths to establish the adjustment reference of the rotating reflector, and then a graticule is placed on each of the light paths between the rotating reflector 5 and the two optical paths to adjust the position of the rotating reflector 5. Since the optical path at the front end of the rotating reflector 5 can be adjusted by translation to compensate for the position deviation of the rotating reflector 5, it is necessary to focus on ensuring the adjustment accuracy of the angles of the two optical paths of the rotating reflector 5, ensuring that the angle deviation of the fixed focal length optical path 2 is ≤30″, and the angle deviation of the continuous zoom optical path 1 is ≤1′ (also called alignment).

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

[0048] S1: Place a first graticule 14 on the overlapping light path of the fixed focal length optical path 2 and the continuous zoom optical path 1, place an inner focusing light tube 17 just in front of the overlapping light path, adjust the position of the inner focusing light tube 17 to align the first graticule 14 with the inner focusing light tube 17, and establish a trans-axis adjustment reference for the rotating reflector 5;

[0049] S2: Place the second graticule 15 and the third graticule 16 on the light paths of the two optical paths in front of the rotating reflector 5, respectively. Adjust the position of the rotating reflector 5 and the height of the limit column 12, so that the graticule images and collimated images of the two optical paths coincide with the rotating reflector through-axis adjustment reference established in S1, and ensure that the angle deviation of the fixed focal length optical path 2 is ≤30″, the center deviation is ≤0.05mm, and the angle deviation of the continuous zoom optical path 1 is ≤1′, and the center deviation is ≤0.05;

[0050] S3: Install the converging lens group 4, the first focusing lens group 6, the large objective lens group 7, the variable magnification 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-light-path split continuous zoom infrared thermal imager;

[0051] S4: Place a collimator 19 in front of the light path of the fixed focal length optical path 2, take the front end reference surface 18 of the base of the fixed focal length optical path 2 as the total reference for installation and adjustment, adjust the position of the initial optical system, align the front end reference surface 18 of the base of the fixed focal length optical path 2 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 to align the center of the detector 3 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 a field of view range test and a uniformity test on the fixed focal length optical path 2. If the requirements are met, proceed to S6. If not, return to S3 to adjust the converging lens group and the first focusing lens group:

[0053] S6: Perform parfocality adjustment of the continuous zoom optical path 1, and test the maximum field of view and the minimum field of view of the 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, the variable magnification lens group 8, the compensation lens group 9, the second focusing lens group 10 and the fixed lens group 11. When returning to S3 for adjustment, each lens group itself may be adjusted, the distance between each lens group may be adjusted, or both may be adjusted.

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

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

[0056] In some embodiments, adjusting the position of the rotating reflector 5 in S2 includes adjusting the height position of the rotating reflector 5 by placing an adjustment gasket 24 under the rotating reflector seat 23 and adjusting the horizontal position of the rotating reflector 5 by translating the rotating reflector 5 .

[0057] In some embodiments, installing the detector 3 in S4 includes installing the detector 3 at a back focus position of the initial optical system by means of positioning pins.

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

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

[0060] Observe the collimator target point through the fixed focal length optical path 2 to observe whether the target point is evenly diffused in a circular shape during the movement of the first focusing lens group 6 within the focusing range;

[0061] Observe the black body 22 placed in front of the light aperture of the fixed focal length optical path 2 through the fixed focal length optical path 2, and observe whether the image of the black body 22 is consistent during the movement of the first focusing lens group 6 within the focusing range.

[0062] If the field of view of the infrared thermal imager with fixed focal length optical path 2 meets the requirements, the target points are evenly diffused in a circular ring, and the image of the black body 22 is consistent, the test requirements are met.

[0063] In some embodiments, the parfocality 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 imaged clearly;

[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 of the infrared thermal imager of the continuous zoom optical path 1 can be imaged clearly.

[0067] In some embodiments, the optical axis consistency adjustment of the continuous zoom optical path 1 includes: taking 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, so that the optical axes of the large field of view and the small field of view are 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 is performed by fine-tuning the angle of the two-dimensional turntable 20.

[0068] In some embodiments, the adjustment of the infrared thermal imager optical axis of the continuous zoom optical path 1 and the center position of the detector 3 includes translating 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, the step S8 of testing the calibration result includes:

[0070] The continuous zoom optical path 1 observes the collimator target point, and observes whether the target point is evenly diffused in a circular shape during the movement of the second focusing lens group 10 within the focusing range;

[0071] The continuous zoom optical path 1 observes the black body 22, and observes whether the image of the black body 22 is consistent during the movement of the second focusing lens group 10 within the focusing range.

[0072] If the target points are evenly spread out in a circular shape and the image of the black body 22 is consistent, the requirement is met.

[0073] In some embodiments, the adjustment method further includes fixing the fixed focal length optical path 2, the continuous zoom optical path 1, the rotating reflector 5, the converging lens group 4 and the detector 3 by fastening screws and dispensing glue.

[0074] The principle of the calibration method provided in any of the above items is as follows:

[0075] Since the fixed focus optical path 2 and the continuous zoom optical path 1 share a set of focusing lens group 4 and detector 3, and the shared focusing lens group 4 and detector 3 are installed 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 adjusting the fixed focal length optical path 2, the front end reference surface 18 of the base is used as the total installation reference, the detector 3 is installed at the theoretical back intercept position through the positioning pin, and the imaging is made clearer by adjusting the front and rear positions of the first focusing lens group 6. Then, by translating the left and right and up and down positions of the detector 3, the center of the detector 3 is aligned with the optical axis, and the deviation is ≤1 pixel. After adjustment according to this method, it can be ensured that the optical axis is perpendicular to the front end reference surface 18 of the base, and various indicators of the fixed focal length optical path 2 meet the requirements.

[0077] When adjusting the imaging of the continuous zoom optical path 1, first adjust the parfocality of the continuous zoom to ensure that the intervals of each lens are correct. And verify by testing the field of view range to ensure that the parfocality and field of view range are qualified, which is the basis for subsequent adjustments. Secondly, fine-tune the optical axis consistency of the continuous zoom system. The optical axis consistency is mainly guaranteed by the method of threading the optical system axis, but due to the errors in each threading link, the threading cannot completely guarantee the requirement of optical axis consistency of large and small fields of view ≤1 pixel. Therefore, it is necessary to fine-tune the optical axis consistency during imaging adjustment. Due to the large focal length difference between the large field of view and the small field of view, the angle of the incident light has different effects on its imaging position on the detector target surface, which has a greater impact on the small field of view and a smaller impact on the large field of view. According to this principle, the optical axis consistency is fine-tuned by fine-tuning the angle of the incident light so that the optical axis consistency meets ≤1 pixel. Finally, adjust the optical axis and the center position of the detector, and adjust the center position of the optical axis. Since the position of the detector 3 has been determined when the fixed focal length optical path 2 is adjusted, it is no longer possible to adjust the position of the detector to ensure that the center of the optical axis of the continuous zoom optical path is aligned with the center of the detector. Through optical simulation analysis, by translating the up-down position and the front-back position 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 center of the detector, with a deviation of ≤1 pixel.

[0078] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A method for calibrating a dual-optical path split type continuous zoom infrared thermal imager, wherein the dual-optical path split type continuous zoom infrared thermal imager comprises a fixed focal length optical path, a continuous zoom optical path and a rotating reflector for switching the optical path, which are arranged at 90 degrees on a mounting base, wherein the fixed focal length optical path and the continuous zoom optical path share a group of converging lenses and a detector, wherein the fixed focal length optical path also comprises a first focusing lens group; the continuous zoom optical path comprises a large objective lens group, a variable magnification lens group, a compensating lens group, a second focusing lens group and a fixed lens group, which are sequentially arranged along the optical path direction. It is characterized in that The method comprises: S1: Place the first graticule on the overlapping light path of the fixed focal length optical path and the continuous zoom optical path, place the inner focusing light tube just in front of the overlapping light path, adjust the position of the inner focusing light tube, align the first graticule with the inner focusing light tube, and establish the through-axis adjustment reference of the rotating reflector; S2: Place the second graticule and the third graticule on the light paths of the two light paths in front of the rotating reflector, respectively. Adjust the position of the rotating reflector and the height of the limit column to make the graticule images and collimated images of the two light paths coincide with the rotating reflector through-axis adjustment reference established in S1. 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-optical path split continuous zoom infrared thermal imager; S4: placing a collimator in front of the light path of the fixed focal length optical path, taking the front end reference plane of the base of the fixed focal length optical path as the total reference for installation and adjustment, adjusting the position of the initial optical system so that the front end reference plane of the base of the fixed focal length optical path is aligned 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 so that the center of the detector is aligned with the optical axis of the initial optical system; S5: Perform a field of view range test and a uniformity test on the fixed focal length optical path. If the requirements are met, proceed to S6. If not, return to S3 to adjust the converging lens group and the first focusing lens group: S6: Perform a parfocality adjustment on the continuous zoom optical path, and test the maximum field of view range and the minimum field of view range 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, the zoom lens group, the compensation lens group, the second focusing lens group, and the fixed lens group. S7: Perform optical axis consistency adjustment for continuous zoom optical path; S8: Calibrate the infrared thermal imager optical axis and the detector center position of the continuous zoom optical path, and test the calibration result. If the requirements are met, the dual-optical path split continuous zoom infrared thermal imager calibration is completed.

2. The dual-optical path split continuous zoom infrared thermal imager calibration method according to claim 1, characterized in that: The adjusting the position of the rotating reflector in S2 includes adjusting the height position of the rotating reflector by placing an adjusting gasket under the mirror seat of the rotating reflector and adjusting the horizontal position of the rotating reflector by translating the rotating reflector.

3. The dual-optical path split continuous zoom infrared thermal imager calibration method according to claim 1, characterized in that: Installing the detector in S4 includes installing the detector at a back focus position of the initial optical system by means of positioning pins.

4. The dual-optical path split continuous zoom infrared thermal imager calibration method according to claim 1, characterized in that: The field of view range test and uniformity test for the fixed focal length optical path includes: Test the field of view of fixed focal length optical path infrared thermal imager; Observe the collimator target through a fixed focal length optical path to see whether the target is evenly diffused in a circular shape during the movement of the first focusing lens group within the focusing range; Observe the black body placed in front of the fixed focal length optical path through the fixed focal length optical path, and observe whether the image of the black body is consistent during the movement of the first focusing lens group within the focusing range. If the field of view of the fixed-focus optical path infrared thermal imager meets the requirements, the target points are evenly diffused in a circular ring, and the black body image is consistent, then the test requirements are met.

5. The dual-optical path split continuous zoom infrared thermal imager calibration method according to claim 1, characterized in that: The continuous zoom optical path parfocality adjustment comprises: By adjusting the front and rear positions of the second focusing lens group, the maximum field of view of the continuous zoom optical path is imaged clearly; The position of the second focusing lens group is fixed; The minimum field of view of the infrared thermal imager with a continuous zoom optical path can be imaged clearly by adjusting the front and rear positions of the large objective lens group.

6. The dual-optical path split continuous zoom infrared thermal imager calibration method according to claim 1, characterized in that: The continuous zoom optical path optical axis consistency adjustment includes: taking the imaging position of the target point in the large field of view as a reference, and fine-tuning the overall angle of the elements constituting the continuous zoom optical path in the initial optical system to make the large field of view and the small field of view optical axes consistent.

7. The dual-optical path split continuous zoom infrared thermal imager calibration method according to claim 1, characterized in that: The adjustment of the infrared thermal imager optical axis and the detector center position for the continuous zoom optical path includes translating the front-back and up-down positions of the continuous zoom optical path lens to align the detector center with the optical axis.

8. The dual-optical path split continuous zoom infrared thermal imager calibration method according to claim 1, characterized in that: The step S8 of testing the calibration result includes: Observe the collimator target point through the continuous zoom optical path, and observe whether the target point spreads evenly in a circular shape during the movement of the second focusing lens group within the focusing range; Observe the black body through the continuous zoom optical path, observe the movement of the second focusing lens group within the focusing range, and observe whether the image of the black body is consistent. If the target points are evenly spread out in a circular shape and the black body image is consistent, the requirements are met.

9. The dual-optical path split continuous zoom infrared thermal imager calibration method according to claim 1, characterized in that: The calibration method further comprises fixing the fixed focal length optical path, the continuous zoom optical path, the rotating reflector, the converging lens group and the detector by means of glue by tightening screws.

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