A method for measuring height differences in a mirror assembly mounting surface

Abstract

A mirror assembly mounting surface height difference measurement method, taking the plane formed by the silicon oil pan in the static state as the horizontal reference surface, adjusting the photoelectric autocollimator to the vertical state, establishing the contact between the photoelectric autocollimator and the horizontal reference surface, then setting the mirror assembly on the horizontal platform, adjusting the attitude of the mirror assembly so that the mirror surface is perpendicular to the photoelectric autocollimator, and then making the mirror surface completely parallel to the horizontal platform surface, establishing the measurement reference with the platform surface as the mounting surface, using the lever micrometer to accurately measure the height difference of the mirror assembly mounting surface, realizing the non-contact measurement of the height difference of the mirror assembly mounting surface relative to the mirror surface. The whole measurement process does not contact the mirror surface of the mirror assembly, overcomes the risk of scratching the mirror surface and causing product scrap in the prior art, and the measurement method is simple, the tooling equipment is less, and the measurement precision is high.

Description

Technical Field

[0001] This invention relates to the field of coarse pointing mechanism reflector assembly technology in space optical communication systems, and specifically to a method for measuring the height difference of the mounting surface of a reflector assembly. Background Technology

[0002] The core device of the space optical communication system is the coarse pointing mechanism. The reflector assembly is the optical transmission carrier of this mechanism. After the reflector assembly is installed in the mechanism, the installation accuracy must reach the arcsecond level. The reflector assembly is fixed to the mechanism through three mounting surfaces (see...). Figure 5 Installation accuracy is ensured by grinding the three mounting surfaces. Theoretically, the three mounting surfaces must be coplanar to guarantee installation accuracy. Therefore, the accuracy of the height difference measurement of the mounting surfaces determines the amount of grinding required and the closest possible coplanarity of the three mounting surfaces. Currently, a common method is to place a standard block on the mirror surface and use a lever dial indicator or a coordinate measuring machine to measure the relative height difference between the mounting surface and the mirror surface. However, since the mirror surface is a high-precision coated surface, this method carries the risk of scratching the mirror surface and rendering the product unusable. Summary of the Invention

[0003] This invention provides a method for measuring the height difference of the mounting surface of a reflector assembly, thereby overcoming the shortcomings of the prior art.

[0004] The technical solution of the present invention: a method for measuring the height difference of the mounting surface of a reflector assembly, comprising the following steps:

[0005] Step 1: Set the photoelectric autocollimator vertically on the adjustment frame, place the silicone oil disk directly below the photoelectric autocollimator, adjust the photoelectric autocollimator using the adjustment frame so that it is vertically aligned with the silicone oil surface of the silicone oil disk, and then fix it.

[0006] Step 2: Remove the silicone oil plate, place the horizontal platform directly below the photoelectric autocollimator, and place the adjustment fixture on the platform.

[0007] Step 3: Place the reflector assembly on the adjustment fixture, and position the reflector assembly directly below the photoelectric autocollimator with the mirror facing upwards. Adjust the attitude of the reflector assembly by adjusting the fixture so that the mirror surface of the reflector assembly is perpendicular to the photoelectric autocollimator.

[0008] Step 4: Set the lever dial indicator on the horizontal platform and use the lever dial indicator to measure the height difference between the mounting surfaces of the reflector components.

[0009] Furthermore, the adjustment fixture is supported above the surface of the horizontal platform by several vertically mounted adjustment screws, and the attitude of the reflector assembly is adjusted by rotating the adjustment screws respectively.

[0010] Preferably, the adjusting screws are arranged according to the distribution positions of the mounting surface of the reflector assembly.

[0011] Preferably, the measurement accuracy of the photoelectric autocollimator is better than 0.1″ and the resolution is better than 0.01″, and the measurement accuracy of the lever dial indicator is better than 0.001mm.

[0012] Compared with the prior art, the present invention has the following advantages and effects: the entire measurement process does not contact the mirror surface of the reflector assembly, which overcomes the risk of scratching the mirror surface and causing product scrapping in the prior art. Moreover, the measurement method is simple, requires fewer tooling and equipment, and has high measurement accuracy. Attached Figure Description

[0013] Figure 1 This is a measurement schematic diagram of step 1 of the present invention;

[0014] Figure 2 This is a schematic diagram of the measurement in steps 2-4 of the present invention;

[0015] Figure 3 This is a schematic diagram of the attitude adjustment of the reflector assembly of the present invention;

[0016] Figure 4 This is a schematic diagram of the lever micrometer setting state of the present invention;

[0017] Figure 5 This is a schematic diagram showing the installation status of the reflector assembly. Detailed Implementation

[0018] The following is in conjunction with the appendix Figure 1-4 The present invention will be described in detail below with reference to specific embodiments.

[0019] A method for measuring the height difference of the mounting surfaces of a reflector assembly includes the following steps:

[0020] Step 1: Install the photoelectric autocollimator 1 vertically on the adjustment frame 7. Place the silicone oil disk 2 directly below the photoelectric autocollimator 1 through the tooling frame 9. Use the silicone oil surface formed when the silicone oil disk 2 is stationary as the horizontal reference plane. Use the adjustment frame 7 to adjust the attitude of the photoelectric autocollimator 1 so that it is vertically perpendicular to the silicone oil surface of the silicone oil disk 2, establish the connection between the photoelectric autocollimator 1 and the horizontal reference plane, and record the angle measurement data X0 and Y0 of the vertical position of the photoelectric autocollimator 1.

[0021] Step 2: Remove the silicone oil tray 2 and the tooling frame 9, place the horizontal platform 6 directly below the photoelectric autocollimator 1, and adjust the horizontal platform 6 so that its table surface is horizontal; place the adjustment fixture 5 in the center of the table surface of the horizontal platform 6; wherein, the adjustment fixture 5 consists of the adjustment platform 5-1 and three adjustment screws 5-2 that are vertically installed on the adjustment platform 5-1 and arranged in a triangular manner, and the adjustment platform 5-1 is supported above the table surface of the horizontal platform 6 by the three adjustment screws 5-2;

[0022] Step 3: Place the reflector assembly 4 stably in the center of the platform 5-1, with the reflector assembly 4 directly below the photoelectric autocollimator 1 and the mirror surface 4-1 facing upwards. Use the adjustment tool 8 to rotate the three adjustment screws 5-2 to continuously change the orientation of the platform 5-1. At the same time, observe the angle measurement data Xn and Yn of the photoelectric autocollimator 1 on the mirror surface 4-1. When the deviation of the angle measurement data Xn and Yn from the angle measurement data X0 and Y0 obtained in Step 1 is close to 0, it indicates that the mirror surface 4-1 of the reflector assembly 4 is in a perpendicular state to the photoelectric autocollimator 1, that is, the mirror surface of the reflector assembly 4 is in a horizontal state. At this time, stop the adjustment and keep the mirror surface 4-1 of the reflector assembly 4 in a horizontal state to establish the connection between the mirror surface 4-1 and the horizontal reference plane, forming a measurement reference that does not contact the mirror surface 4-1 of the reflector assembly 4 and uses the platform 6 as the mounting surface 4-2 of the reflector assembly 4.

[0023] Step 4: Place the lever micrometer 3 on the horizontal platform 6. Use the lever micrometer 3 to measure the height difference of the three mounting surfaces 4-2 of the reflector assembly 4, and calculate the height difference between the three mounting surfaces. The height difference of the three mounting surfaces should be less than 0.005. If the height difference is greater than 0.005, the mounting surface needs to be ground. After grinding, measure again until the three mounting surfaces are as close to coplanar as possible, ensuring the parallelism between the mirror surface and the mounting surface, and thus ensuring the installation accuracy of the reflector assembly.

[0024] To improve adjustment efficiency, the three adjustment screws 5-2 are set according to the distribution positions of the three mounting surfaces 4-2 of the reflector assembly 4.

[0025] To improve measurement accuracy, the photoelectric autocollimator has a measurement accuracy better than 0.1″ and a resolution better than 0.01″, and the lever dial indicator has a measurement accuracy better than 0.001mm.

[0026] This invention uses the plane formed by the silicone oil disk in a static state as a horizontal reference plane to adjust the photoelectric autocollimator to a vertical state, establishing a connection between the photoelectric autocollimator and the horizontal reference plane. Then, by placing the reflector assembly on a horizontal platform and adjusting its orientation so that its mirror surface is perpendicular to the photoelectric autocollimator, the mirror surface is made completely parallel to the horizontal platform surface. This establishes a measurement reference with the horizontal platform surface as the mounting surface. Using this reference, a lever dial indicator is used to accurately measure the height difference between the mounting surface and the mirror surface of the reflector assembly, achieving non-contact measurement of the height difference between the mounting surface and the mirror surface. The entire measurement process does not contact the mirror surface of the reflector assembly, overcoming the risk of scratching the mirror surface and causing product scrapping associated with existing technologies. Furthermore, the measurement method is simple, requires few tooling devices, and has high measurement accuracy.

[0027] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent variations made to the content described in the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A method for measuring the height difference of the mounting surface of a reflector assembly, characterized in that, Includes the following steps: Step 1: Set the photoelectric autocollimator vertically on the adjustment frame, place the silicone oil disk directly below the photoelectric autocollimator, adjust the photoelectric autocollimator using the adjustment frame so that it is vertically aligned with the silicone oil surface of the silicone oil disk, and then fix it. Step 2: Remove the silicone oil plate, place the horizontal platform directly below the photoelectric autocollimator, and place the adjustment fixture on the platform. Step 3: Place the reflector assembly on the adjustment fixture, ensuring it is directly below the photoelectric autocollimator with its mirror facing upwards. Adjust the reflector assembly's orientation using the adjustment fixture until its mirror is perpendicular to the photoelectric autocollimator. The adjustment fixture is supported above the horizontal platform by several vertically mounted adjustment screws. Adjust the reflector assembly's orientation by rotating these screws. The adjustment screws are positioned according to the mounting surface of the reflector assembly. Step 4: Set the lever micrometer on the horizontal platform and use the lever micrometer to measure the height difference of the three mounting surfaces of the reflector assembly; calculate the height difference between the three mounting surfaces. If the height difference is greater than 0.005, grind the mounting surfaces until the requirement that the three mounting surfaces are as close to coplanar as possible is met.

2. The method for measuring the height difference of the mounting surface of a reflector assembly according to claim 1, characterized in that: The measurement accuracy of the photoelectric autocollimator is better than 0.1″ and the resolution is better than 0.01″. The measurement accuracy of the lever dial indicator is better than 0.001mm.

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