A fiducial machining correction method for improving the coaxial coupling accuracy of a detector assembly

Abstract

The application discloses a reference machining correction method for improving coupling coaxial precision of a detector assembly, and solves the problem that the existing image intensifier correction machining method is difficult to guarantee parallel precision of each surface of the image intensifier and flatness of an image intensifier center reference leading-out tool. The application sets the theodolite and autocollimator on the left and right sides of the high-precision centering lathe respectively, and uses the theodolite and autocollimator to respectively process and correct the anode flange end surface of the image intensifier, the cathode flange end surface of the image intensifier and the image intensifier center reference leading-out tool, and the processing and correction has a unique reference, so that the parallel precision of each surface of the image intensifier and the flatness of the image intensifier center reference leading-out tool are greatly improved, and the coupling coaxial precision of the detector assembly can be further improved.

Description

Technical Field

[0001] The invention relates to a detector assembly, and in particular to a reference processing and correction method for improving the coupling coaxial accuracy of the detector assembly. Background Art

[0002] The coupled coaxial detector assembly is suitable for multi-line array low-light detector assembly imaging in the aerospace field. The coupled coaxial detector assembly is to achieve the coupled coaxial detector and image intensifier through a combination of special instruments and equipment. Figure 1 and Figure 2 As shown, the image intensifier mainly includes a flange, an anode 01, and a cathode 03 (photocathode), wherein the flange has an anode flange end face 02 and a cathode flange end face 04. When coupling the image intensifier with the detector, it is easy to cause the center reference offset. Therefore, it is often necessary to use conventional image intensifier correction processing methods to process and correct it to improve the coaxial accuracy of the coupling detector assembly of the space optical camera. Currently, conventional image intensifier processing and correction methods have the following problems: the image point positions on the front and rear surfaces of the image intensifier cathode are difficult to distinguish, and they mostly rely on the operating experience of the centering personnel. This can easily result in insufficient parallelism between the flange end face and the anode surface after centering processing; using the image reflected by the image intensifier anode as a reference, two autocollimators are used to calibrate the reference lead-out tooling, which makes it difficult to achieve the preset processing accuracy. Summary of the Invention

[0003] In order to solve the technical problem that the existing image intensifier correction processing method is difficult to ensure the parallel accuracy and flatness of each surface of the image intensifier and the image intensifier center reference lead-out tooling, which makes it difficult to improve the coupling coaxial accuracy of the detector assembly, the present invention provides a reference processing correction method for improving the coupling coaxial accuracy of the detector assembly.

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

[0005] A reference processing and correction method for improving the coupling coaxial accuracy of a detector assembly is characterized in that it includes the following steps:

[0006] Step 1: Place the theodolite and the autocollimator on the left and right sides of a high-precision centering lathe, respectively, and make the theodolite and the autocollimator coaxially coincide at infinity; the high-precision centering lathe is provided with a spindle box, a four-dimensional adjustment bracket, and a four-dimensional adjustment bracket adapter tooling connected in sequence;

[0007] Step 2: Connect and tighten the image intensifier center reference lead-out fixture to the four-dimensional adjustment bracket adapter fixture;

[0008] Step 3. Connect and tighten the image intensifier, whose anode and cathode are parallel to each other, to the image intensifier center reference lead-out fixture, so that the anode of the image intensifier faces the autocollimator. Using the reflected image of the anode of the image intensifier in the autocollimator as the calibration reference, use a high-precision centering lathe to machine and calibrate the anode flange end face of the image intensifier so that the anode and the anode flange end faces are parallel to each other.

[0009] Step 4. Reconnect the image intensifier to the image intensifier center reference lead-out fixture and tighten it, so that the cathode of the image intensifier faces the autocollimator. Using the reflected image of the cathode of the image intensifier in the autocollimator as the calibration reference, use a high-precision centering lathe to machine and calibrate the cathode flange end face of the image intensifier so that the anode and cathode flange end faces are parallel to each other.

[0010] Step 5: Check the flatness of the anode flange end face, the flatness of the cathode flange end face, the parallelism between the anode and anode flange end faces, and the parallelism between the anode and cathode flange end faces of the image intensifier. If all four meet the requirements, the image intensifier processing and calibration is completed. Otherwise, return to step 3 until all four meet the requirements.

[0011] Step 6. Connect and tighten the image intensifier to the image intensifier center reference lead-out fixture, so that the anode of the image intensifier faces the theodolite. Using the theodolite autocollimation image reflected by the anode as a reference, use a high-precision centering lathe to machine and calibrate the surface of the image intensifier center reference lead-out fixture facing the autocollimator so that it is parallel to the anode.

[0012] Step 7: Check the surface flatness of the image intensifier center reference lead-out fixture toward the autocollimator and the parallelism of the surface with the anode. If both meet the requirements, the reference processing correction for improving the coaxial accuracy of the detector assembly coupling is completed. Otherwise, return to step 6 until both meet the requirements.

[0013] Furthermore, step 4 specifically includes:

[0014] 4.1. Reconnect the image intensifier to the image intensifier center reference lead fixture and tighten it so that the cathode of the image intensifier faces the autocollimator;

[0015] 4.2. Attach a reflective film to the front surface of the cathode of the image intensifier. Use the reflected image of the reflective film in the autocollimator to determine the reflected image of the cathode on the rear surface in the autocollimator.

[0016] 4.3. Use the four-dimensional adjustment bracket adapter to adjust the reflection image jitter of the reflective film in the autocollimator to the minimum;

[0017] 4.4. Using the rear surface reflection image in the autocollimator as the calibration reference, control the turning feed rate, and use a high-precision centering lathe to machine and calibrate the cathode flange end face of the image intensifier so that the anode and cathode flange end faces are parallel to each other.

[0018] Furthermore, step 4.2 specifically includes:

[0019] 4.2.1. Adjust the autocollimator to infinity. Through the eyepiece on the autocollimator, you can observe two bright cross reflection images and a reference cross image on the cathode of the image intensifier. The two bright cross reflection images are the front and back surface reflection images of the cathode, respectively. The reference cross image is the reflection image of the autocollimator's built-in reticle. The front surface reflection image is the reflection image of the cathode surface away from the anode.

[0020] 4.2.2. If a reflective film is applied to the front surface of the image intensifier cathode, three bright cross reflection images and one reference cross image can be observed in the eyepiece. The extra bright cross reflection image is the reflection image of the reflective film.

[0021] 4.2.3. Adjust the hand wheel of the eyepiece so that the extra bright cross reflection image is infinitely close to one of the other two bright cross reflection images. The other of the other two bright cross reflection images is the reflection image of the cathode's rear surface.

[0022] Furthermore, in step 4.2.2:

[0023] The reflective film is an LED liquid crystal reflective film with a reflectivity of ≥97%, a thickness of 0.07 mm, and an optical adhesive on the back.

[0024] Furthermore, in step 4.2.2:

[0025] The area of ​​the reflective film is smaller than the area of ​​the front surface of the cathode.

[0026] Furthermore, step 3 specifically includes:

[0027] 3.1. Connect and tighten the image intensifier with its anode and cathode parallel to each other to the image intensifier center reference lead-out fixture, so that the anode of the image intensifier faces the autocollimator;

[0028] 3.2. Use the four-dimensional adjustment bracket adapter to adjust the anode reflection image jitter of the image intensifier anode in the autocollimator to the minimum;

[0029] 3.3. Using the anode reflection image of the image intensifier's anode in the autocollimator as the calibration reference, control the turning feed rate and use a high-precision centering lathe to machine and calibrate the anode flange end face of the image intensifier so that the anode and the anode flange end faces are parallel to each other.

[0030] Furthermore, in step 3.3:

[0031] The turning feed Where D is the flange diameter of the image intensifier, and rpm is the rotation speed of the high-precision centering lathe.

[0032] Furthermore, step 2 specifically includes:

[0033] 2.1. Adjust the outer circle swing of the four-dimensional adjustment bracket adapter fixture through the four-dimensional adjustment bracket and measure it with a dial indicator so that the swing value t0 satisfies t0∈(0mm, 0.02mm);

[0034] 2.2. Connect and tighten the image intensifier center reference lead-out fixture to the four-dimensional adjustment bracket adapter fixture.

[0035] Furthermore, step 1 specifically includes:

[0036] 1.1. Place the theodolite on the two-dimensional adjustment table, and place the two-dimensional adjustment table on the left side of the high-precision centering lathe;

[0037] 1.2. Place the autocollimator on the right side of the high-precision centering lathe and make it coaxial with the spindle of the high-precision centering lathe;

[0038] 1.3. Adjust the theodolite to infinity and use the two-dimensional adjustment table to make the theodolite and autocollimator coaxially coincide.

[0039] Furthermore, step 5 is specifically as follows:

[0040] Use a three-coordinate measuring machine to test the flatness of the anode flange end face of the image intensifier, the flatness of the cathode flange end face, the parallelism of the anode and anode flange end faces, and the parallelism of the anode and cathode flange end faces. If all four meet the requirements, the processing and correction of the image intensifier are completed. Otherwise, return to step 3 until all four meet the requirements.

[0041] Beneficial effects of the present invention:

[0042] 1. The present invention provides a reference processing and correction method for improving the coaxial accuracy of the detector assembly coupling. The method arranges a theodolite and an autocollimator on the left and right sides of a high-precision centering lathe, respectively, to perform processing and correction on the anode flange end face of the image intensifier, the cathode flange end face of the image intensifier, and the image intensifier center reference lead-out tooling. The processing and correction has a unique reference, thereby greatly improving the parallel accuracy of each surface on the image intensifier and the flatness of the image intensifier center reference lead-out tooling, and can further improve the coaxial accuracy of the detector assembly coupling.

[0043] 2. The present invention sticks a reflective film on the cathode of the image intensifier, adjusts the eyepiece hand wheel, observes the reflected image of the reflective film in the autocollimator, and judges the reflected image of the rear surface of the image intensifier cathode. This improves the recognition of the reflected images on the front and rear surfaces of the photocathode of the image intensifier, reduces the probability of incorrect image point position judgment during optical centering, and improves the accuracy of the reference calibration of the image intensifier when coupled coaxially.

[0044] 3. Compared with ordinary plane reflectors, the LED reflective film used in the present invention has a high reflectivity, can better fit with the surface of the image intensifier photocathode, and the adhesive layer is easy to clean; at the same time, it can reduce the risk of scratching the surface of the image intensifier photocathode.

[0045] 4. The present invention uses a theodolite to process and calibrate the image intensifier center reference lead-out tooling, which can improve the parallelism between the image intensifier center reference lead-out tooling and the image intensifier anode from a minimum of 0.015 mm to a maximum of 0.01 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is one of the structural diagrams of the image intensifier;

[0047] Figure 2 This is the second structural diagram of the image intensifier;

[0048] Figure 3 It is a flow chart of an embodiment of a reference processing correction method for improving the coupling coaxial accuracy of a detector assembly according to the present invention;

[0049] Figure 4 2 is a schematic diagram of the structure of the theodolite and the autocollimator being coaxial in step 1 of an embodiment of the present invention;

[0050] Figure 5 2 is a schematic structural diagram of the image intensifier center reference lead-out tooling used in step 2 of an embodiment of the present invention;

[0051] Figure 6 It is a schematic diagram of the reflected image in steps 4.2.1 to 4.2.3 in an embodiment of the present invention, wherein (a) is a schematic diagram of the reflected image observed through the eyepiece on the autocollimator when the reflective film is not attached, and (b) is a schematic diagram of the reflected image observed through the eyepiece on the autocollimator when the reflective film is attached.

[0052] Figure Number:

[0053] 01- anode, 02- anode flange end face, 03- cathode, 04- cathode flange end face; 2-1, theodolite, 2-2, autocollimator, 2-3, two-dimensional adjustment table, 2-4, eyepiece, 2-5, handwheel, 3-1, spindle box, 3-2, four-dimensional adjustment bracket, 3-3, four-dimensional adjustment bracket adapter, 4-1, image intensifier center reference lead-out fixture, 4-3, cable protection groove, 5-1, reference cross image, 5-2, first bright cross reflection image, 5-3-1, second bright cross reflection image, 5-3-2, third bright cross reflection image. DETAILED DESCRIPTION

[0054] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings and embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0055] The embodiment of the present invention provides a reference processing correction method for improving the coupling coaxial accuracy of a detector assembly, such as Figure 3 As shown, the following steps are included:

[0056] Step 1: Figure 4 As shown, the theodolite 2-1 and the autocollimator 2-2 are placed on the left and right sides of the high-precision centering lathe respectively, and the theodolite 2-1 and the autocollimator 2-2 are coaxially coincident at infinity; the high-precision centering lathe is provided with a spindle box 3-1, a four-dimensional adjustment bracket 3-2 and a four-dimensional adjustment bracket adapter 3-3 connected in sequence; specifically, it includes:

[0057] 1.1. Place the theodolite 2-1 on the two-dimensional adjustment table 2-3, and place the two-dimensional adjustment table 2-3 on the left side of the high-precision centering lathe;

[0058] 1.2. Place the autocollimator 2-2 on the right side of the high-precision centering lathe and make it coaxial with the main shaft of the high-precision centering lathe;

[0059] 1.3. Adjust the theodolite 2-1 to infinity and use the two-dimensional adjustment stage 2-3 to make the theodolite 2-1 and the autocollimator 2-2 coaxially coincide.

[0060] Step 2: Connect and tighten the image intensifier center reference lead fixture 4-1 to the four-dimensional adjustment bracket adapter fixture 3-3 through screws; specifically including: Figure 5 As shown, a cable protection groove 4-3 is provided on the image intensifier center reference lead-out tooling 4-1, and 3M tape can be used to adhere and fix the intensifier cable during the processing and calibration process to prevent damage;

[0061] 2.1. Adjust the outer circle swing of the four-dimensional adjustment bracket adapter 3-3 through the four-dimensional adjustment bracket 3-2 and measure it with a dial indicator so that the swing value t0 satisfies t0∈(0mm, 0.02mm);

[0062] 2.2. Connect and tighten the image intensifier center reference lead-out fixture 4-1 to the four-dimensional adjustment bracket adapter fixture 3-3.

[0063] Step 3: Connect and fasten the image intensifier, whose anode 01 and cathode 03 are parallel to each other, to the image intensifier center reference lead-out tool 4-1, so that the anode 01 of the image intensifier faces the autocollimator 2-2. Using the reflected image of the anode 01 of the image intensifier in the autocollimator 2-2 as the calibration reference, use a high-precision centering lathe to machine and calibrate the anode flange end face 02 of the image intensifier so that the anode 01 and the anode flange end face 02 are parallel to each other. Specifically, the steps include:

[0064] 3.1. Connect and tighten the image intensifier, whose anode 01 and cathode 03 are parallel to each other, to the image intensifier center reference lead-out fixture 4-1, so that the anode 01 of the image intensifier faces the autocollimator 2-2;

[0065] 3.2. Adjust the slider and different hole spacing on the four-dimensional adjustment bracket adapter 3-3 to minimize the anode reflection image jitter of the image intensifier anode 01 in the autocollimator 2-2;

[0066] 3.3. Use the anode reflection image of the image intensifier anode 01 in the autocollimator 2-2 as the calibration reference to control the turning feed rate. A high-precision centering lathe is used to process and correct the anode flange end face 02 of the image intensifier so that the anode 01 and the anode flange end face 02 are parallel to each other; where D is the flange diameter of the image intensifier, and rpm is the rotation speed of the high-precision centering lathe.

[0067] Step 4: Reconnect and tighten the image intensifier to the image intensifier center reference lead-out fixture 4-1, so that the cathode 03 of the image intensifier faces the autocollimator 2-2. Using the reflected image of the cathode 03 of the image intensifier in the autocollimator 2-2 as the calibration reference, use a high-precision centering lathe to machine and calibrate the cathode flange end face 04 of the image intensifier so that the anode 01 and the cathode flange end face 04 are parallel to each other. Specifically, the steps include:

[0068] 4.1. Reconnect the image intensifier to the image intensifier center reference lead fixture 4-1 and tighten it, so that the cathode 03 of the image intensifier faces the autocollimator 2-2;

[0069] 4.2. Pasting a reflective film on the front surface of the image intensifier cathode 03, and judging the reflected image of the cathode 03 on the rear surface in the autocollimator 2-2 by the reflected image of the reflective film in the autocollimator 2-2; specifically including:

[0070] 4.2.1、 Figure 6 As shown in (a), the autocollimator 2-2 is adjusted to infinity. Through the eyepiece 2-4 on the autocollimator 2-2, it can be observed that the cathode 03 of the image intensifier has a first bright cross reflection image 5-2, a second bright cross reflection image 5-3-1 and a reference cross image 5-1. The first bright cross reflection image 5-2 and the second bright cross reflection image 5-3-1 are the front surface reflection image and the back surface reflection image of the cathode 03 respectively. The reference cross image 5-1 is the reflection image of the built-in graticule of the autocollimator 2-2; the front surface reflection image is the surface reflection image of the cathode 03 away from the anode 01;

[0071] 4.2.2, such as Figure 6 As shown in Figure (b), a reflective film is attached to the front surface of the image intensifier cathode 03. A first bright cross reflection image 5-2, a second bright cross reflection image 5-3-1, a third bright cross reflection image 5-3-2, and a reference cross image 5-1 can be observed in the eyepiece 2-4. The extra third bright cross reflection image 5-3-2 is the reflection of the reflective film. The attached reflective film is an LED liquid crystal reflective film with a reflectivity of ≥97% and a thickness of 0.07 mm. Optical adhesive is applied to the back to facilitate cleaning of excess material from the image intensifier photocathode surface after removal. The attached reflective film has an area smaller than the front surface area of ​​the cathode 03.

[0072] 4.2.3. Rotate the handwheel 2-5 for adjusting the eyepiece 2-4 so that the additional bright cross reflection image is infinitely close to one of the remaining two bright cross reflection images. The other of the remaining two bright cross reflection images is the reflection image of the rear surface of cathode 03. Specifically, rotate the handwheel 2-5 of the eyepiece 2-4 so that the third bright cross reflection image 5-3-2 approaches the second bright cross reflection image 5-3-1. Therefore, the first bright cross reflection image 5-2 is the reflection image of the rear surface of cathode 03.

[0073] 4.3. Adjust the reflection image jitter of the reflective film in the autocollimator 2-2 to the minimum by using the four-dimensional adjustment bracket adapter 3-3, usually making the reflection image jitter V ≤ 1 μm;

[0074] 4.4. Using the rear surface reflection image in the autocollimator 2-2 as the calibration reference, control the turning feed rate and use a high-precision centering lathe to machine and calibrate the cathode flange end face 04 of the image intensifier so that its anode 01 and cathode flange end face 04 are parallel to each other.

[0075] Step 5. Use a three-coordinate measuring instrument to test the flatness of the anode flange end face 02 of the image intensifier, the flatness of the cathode flange end face 04, the parallelism of the anode 01 and the anode flange end face 02, and the parallelism of the anode 01 and the cathode flange end face 04. If all four meet the requirements, the processing and correction of the image intensifier are completed. Otherwise, return to step 3 until all four meet the requirements. Specifically, the tested parallelism is required to be better than 0.01mm and the flatness is better than 0.01mm.

[0076] Step 6. Connect and tighten the image intensifier to the image intensifier center reference lead-out fixture 4-1, so that the anode 01 of the image intensifier faces the theodolite 2-1. Using the theodolite autocollimation image reflected by the anode 01 as the reference, use a high-precision centering lathe to process and correct the flatness of the surface of the image intensifier center reference lead-out fixture 4-1.

[0077] Step 7: Check the flatness of the surface of the image intensifier center reference lead-out fixture 4-1. If it does not meet the requirements, return to step 6 until it meets the requirements, and the reference processing correction for improving the coupling coaxial accuracy of the detector assembly is completed.

[0078] When connecting and tightening all components in the above steps, a torque wrench must be used to control the tightening torque.

[0079] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention shall be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A reference processing and correction method for improving the coaxial coupling accuracy of a detector assembly, characterized in that: The following steps are involved: Step 1: placing a theodolite (2-1) and an autocollimator (2-2) on the left and right sides of a high-precision centering lathe, respectively, and making the theodolite (2-1) and the autocollimator (2-2) coaxially coincide at infinity; the high-precision centering lathe is provided with a spindle box (3-1), a four-dimensional adjustment bracket (3-2), and a four-dimensional adjustment bracket adapter tool (3-3) connected in sequence; Step 2: Connect and tighten the image intensifier center reference lead-out fixture (4-1) to the four-dimensional adjustment bracket adapter fixture (3-3); Step 3, connecting and fastening the image intensifier with its anode (01) and cathode (03) parallel to each other to the image intensifier center reference lead-out tooling (4-1), so that the anode (01) of the image intensifier faces the autocollimator (2-2), and using the reflected image of the anode (01) of the image intensifier in the autocollimator (2-2) as a correction reference, using a high-precision centering lathe to process and correct the anode flange end face (02) of the image intensifier so that the anode (01) and the anode flange end face (02) are parallel to each other; Step 4: Reconnect and tighten the image intensifier to the image intensifier center reference lead-out fixture (4-1), so that the cathode (03) of the image intensifier faces the autocollimator (2-2), and use the reflected image of the cathode (03) of the image intensifier in the autocollimator (2-2) as the correction reference, and use a high-precision centering lathe to process and correct the cathode flange end face (04) of the image intensifier so that the anode (01) and the cathode flange end face (04) are parallel to each other; Step 5: respectively inspect the flatness of the anode flange end face (02) of the image intensifier, the flatness of the cathode flange end face (04), the parallelism between the anode (01) and the anode flange end face (02), and the parallelism between the anode (01) and the cathode flange end face (04). If all four meet the requirements, the image intensifier processing correction is completed. Otherwise, return to step 3 until all four meet the requirements. Step 6: Connect and tighten the image intensifier to the image intensifier center reference lead-out tool (4-1), so that the anode (01) of the image intensifier faces the theodolite (2-1), and use a high-precision centering lathe to process and calibrate the surface of the image intensifier center reference lead-out tool (4-1) facing the autocollimator (2-2) with the theodolite autocollimation image reflected by the anode (01) as a reference, so that the surface is parallel to the anode (01); Step 7: Check the surface flatness of the image intensifier center reference lead-out fixture (4-1) toward the autocollimator (2-2) and the parallelism of the surface with the anode (01). If both meet the requirements, the reference processing correction for improving the coaxial accuracy of the detector assembly coupling is completed. Otherwise, return to step 6 until both meet the requirements.

2. The reference processing and correction method for improving the coupling coaxial accuracy of the detector assembly according to claim 1, characterized in that: Step 4 specifically includes: 4.

1. Reconnect the image intensifier to the image intensifier center reference lead-out fixture (4-1) and tighten it so that the cathode (03) of the image intensifier faces the autocollimator (2-2); 4.

2. A reflective film is attached to the front surface of the cathode (03) of the image intensifier, and the reflected image of the rear surface of the cathode (03) in the autocollimator (2-2) is determined by the reflected image of the reflective film in the autocollimator (2-2); 4.

3. Adjust the jitter of the reflection image of the reflection film in the autocollimator (2-2) to the minimum through the four-dimensional adjustment bracket adapter (3-3); 4.

4. Using the rear surface reflection image in the autocollimator (2-2) as a calibration reference, control the turning feed rate, and use a high-precision centering lathe to process and calibrate the cathode flange end face (04) of the image intensifier so that the anode (01) and the cathode flange end face (04) are parallel to each other.

3. The reference processing and correction method for improving the coupling coaxial accuracy of the detector assembly according to claim 2, characterized in that: Step 4.2 specifically includes: 4.2.

1. Adjust the autocollimator (2-2) to infinity, and observe through the eyepiece (2-4) on the autocollimator (2-2) that the cathode (03) of the image intensifier has two bright cross reflection images and one reference cross image, wherein the two bright cross reflection images are respectively a front surface reflection image and a rear surface reflection image of the cathode (03), and the reference cross image is a reflection image of the built-in graticule of the autocollimator (2-2); the front surface reflection image is a surface reflection image of the cathode (03) away from the anode (01); 4.2.

2. A reflective film is attached to the front surface of the cathode (03) of the image intensifier. Then, three bright cross reflection images and one reference cross image can be observed in the eyepiece (2-4). The extra bright cross reflection image is the reflection image of the reflective film. 4.2.

3. Adjust the hand wheel (2-5) of the eyepiece (2-4) so ​​that the extra bright cross reflection image is infinitely close to one of the other two bright cross reflection images. Then, the other of the other two bright cross reflection images is the rear surface reflection image of the cathode (03).

4. The reference processing and correction method for improving the coupling coaxial accuracy of a detector assembly according to claim 3, characterized in that: In step 4.2.2: The reflective film is an LED liquid crystal reflective film with a reflectivity of ≥97%, a thickness of 0.07 mm, and an optical adhesive on the back.

5. The reference processing and correction method for improving the coupling coaxial accuracy of a detector assembly according to claim 4, characterized in that: In step 4.2.2: The area of ​​the reflective film is smaller than the front surface area of ​​the cathode (03).

6. The reference processing and correction method for improving the coupling coaxial accuracy of a detector assembly according to any one of claims 1 to 5, characterized in that: Step 3 specifically includes: 3.

1. Connect and tighten the image intensifier with its anode (01) and cathode (03) parallel to each other to the image intensifier center reference lead-out tooling (4-1), so that the anode (01) of the image intensifier faces the autocollimator (2-2); 3.

2. Adjusting the anode reflection image jitter of the image intensifier anode (01) in the autocollimator (2-2) to a minimum through the four-dimensional adjustment bracket adapter (3-3); 3.

3. Using the anode reflection image of the image intensifier's anode (01) in the autocollimator (2-2) as a calibration reference, control the turning feed rate, and use a high-precision centering lathe to perform machining and calibration on the anode flange end face (02) of the image intensifier so that the anode (01) and the anode flange end face (02) are parallel to each other.

7. The reference processing and correction method for improving the coupling coaxial accuracy of a detector assembly according to claim 6, characterized in that: In step 3.3: The turning feed Where D is the flange diameter of the image intensifier, and rpm is the rotation speed of the high-precision centering lathe.

8. The reference processing and correction method for improving the coupling coaxial accuracy of a detector assembly according to claim 7, characterized in that: Step 2 specifically includes: 2.

1. Adjust the outer circle swing of the four-dimensional adjustment bracket adapter (3-3) by using the four-dimensional adjustment bracket (3-2) and measure it with a dial indicator so that the swing value t0 satisfies t0∈(0mm, 0.02mm); 2.

2. Connect and tighten the image intensifier center reference lead-out fixture (4-1) and the four-dimensional adjustment bracket adapter fixture (3-3).

9. The reference processing and correction method for improving the coupling coaxial accuracy of a detector assembly according to claim 8, characterized in that: Step 1 specifically includes: 1.

1. Place the theodolite (2-1) on the two-dimensional adjustment table (2-3), and place the two-dimensional adjustment table (2-3) on the left side of the high-precision centering lathe; 1.

2. Place the autocollimator (2-2) on the right side of the high-precision centering lathe and make it coaxial with the main shaft of the high-precision centering lathe; 1.

3. Adjust the theodolite (2-1) to infinity, and use the two-dimensional adjustment table (2-3) to make the theodolite (2-1) and the autocollimator (2-2) coaxially coincide.

10. The reference processing and correction method for improving the coupling coaxial accuracy of a detector assembly according to claim 9, characterized in that: Step 5 is as follows: Use a three-coordinate measuring instrument to respectively detect the flatness of the anode flange end face (02) of the image intensifier, the flatness of the cathode flange end face (04), the parallelism of the anode (01) and the anode flange end face (02), and the parallelism of the anode (01) and the cathode flange end face (04). If all four meet the requirements, the processing correction of the image intensifier is completed. Otherwise, return to step 3 until all four meet the requirements.

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