A method of aligning a planar mirror

Abstract

This invention relates to optical assembly technology. To address the shortcomings of existing plane mirror assembly methods, such as their inability to meet the assembly requirements of large and complex optical systems and the low assembly accuracy of plane mirrors, a new method for aligning plane mirrors is proposed. First, a spherical mirror fixture and an external first centering device within the optical system are used to determine the spherical center image. A target sphere is placed at the location of the spherical center image, and its position coordinates A are determined using a coordinate measuring device. Finally, the reflection position coordinates of the target sphere are calculated using optical reflection formulas. A ′ Adjust the external second centering device to focus it on the reflection position coordinates of the target ball. A ′ On the target sphere; finally, remove the sphere center image and reflection position coordinates. A ′ For the target ball, install and adjust the plane mirror. Observe the reflected center image of the ball on the plane mirror through the external second centering device. Adjust the plane mirror until the reflected center image of the ball aligns with the coordinates of the reflection position. A ′ The two mirrors are aligned, thus completing the installation and calibration of the plane mirror.

Description

Technical Field

[0001] This invention relates to optical assembly technology, and more specifically to a method for aligning a plane mirror. Background Technology

[0002] In optical systems, optical axis calibration is a very important task. Optical axis calibration refers to the process of aligning the optical axis of the optical system with the mechanical axis. By calibrating the optical axis, the imaging quality and measurement accuracy of the optical system can be improved.

[0003] A reflector is an optical element that reflects incident light. Traditionally, the method for assembling reflectors in optical systems involves leveling the entire system using the Earth's horizontal plane as a reference and employing a theodolite to determine the reflector's angle. The drawback of this method is that leveling the entire optical system is difficult for large and complex systems, making it unsuitable for such applications. Furthermore, this method only determines the angle of reflection, not the precise front-to-back position of the reflector, thus compromising the accuracy of its installation. Summary of the Invention

[0004] The purpose of this invention is to solve the problems that existing assembly methods for plane mirrors cannot meet the assembly requirements of large and complex optical systems, as well as the problems of low assembly accuracy and inaccurate assembly position of plane mirrors, and to propose an assembly and calibration method for plane mirrors.

[0005] To achieve the above objectives, the solution proposed by this invention is as follows:

[0006] A method for calibrating a plane mirror, characterized by the following steps:

[0007] Step 1: Set up a spherical mirror fixture in the optical system, and use the spherical mirror fixture and the external first centering device to determine the spherical center image of the spherical mirror;

[0008] Step 2: Place the target ball at the position of the center image and determine the position coordinates A of the target ball using a coordinate measuring device;

[0009] Step 3: Based on the theoretical position of the plane mirror to be installed, calculate the reflection position coordinates A′ of the target ball using the optical reflection formula, and place the target ball at the reflection position coordinates A′.

[0010] Step 4: Adjust the external second centering device to focus it onto the target ball at the reflection position coordinate A′ of the target ball;

[0011] Step 5: Remove the sphere center image and the target sphere at the reflection position coordinate A′, install and adjust the plane mirror, and observe the reflected sphere center image on the plane mirror through the external second centering device. Adjust the plane mirror until the reflected sphere center image coincides with the reflection position coordinate A′, thus completing the installation and calibration of the plane mirror.

[0012] Further, step one specifically involves: setting up a spherical mirror fixture in the optical system, emitting light waves to the spherical mirror fixture using an external first centering device, and adjusting the external first centering device so that its focal point coincides with the spherical center image of the spherical mirror fixture, thereby determining the spherical center image of the spherical mirror.

[0013] Furthermore, both the first centering device and the second centering device are autocollimating microscopes or spherical interferometers.

[0014] Furthermore, the coordinate measuring device mentioned in step two is a coordinate measuring machine or a laser tracker.

[0015] Furthermore, the optical reflection formula described in step three is calculated as: A′=RA,

[0016] Where R is the effect matrix of the plane mirror.

[0017] The beneficial effects of this invention are:

[0018] [1] The plane mirror assembly and calibration method of the present invention uses the principle of optical reflection to accurately calibrate the plane mirror in the optical system, which greatly improves the assembly accuracy and calibration accuracy of the plane mirror, and can also accurately control the assembly angle and position of the plane mirror. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the mounting and calibration method for the plane mirror of the present invention;

[0020] Reference numerals: 1-First centering device, 2-Second centering device, 3-Spherical reflecting mirror fixture, 4-Plane reflecting mirror, 5-Spherical center image, 6-Reflected spherical center image. Detailed Implementation

[0021] like Figure 1 As shown, a method for calibrating a plane mirror includes the following steps:

[0022] Step 1: Set up a spherical mirror fixture 3 in the optical system, and use the spherical mirror fixture 3 and the external first centering device 1 to determine the spherical center image 5 of the spherical mirror fixture 3;

[0023] The external first centering device 1 uses an autocollimating microscope. The autocollimating microscope is aligned with the spherical mirror fixture 3 so that the focal point of the autocollimating microscope coincides with the spherical center image 5 of the spherical mirror fixture 3. That is, by observing the reflected light received by the autocollimating microscope from the spherical mirror fixture 3, a clear image can be presented on it.

[0024] Step 2: Place the target ball at position 5 of the center image, and determine the position coordinates A of the target ball using a coordinate measuring device; wherein, the coordinate measuring device is a three-coordinate measuring machine or a laser tracker;

[0025] Step 3: Based on the theoretical position of the plane mirror 4 to be installed, calculate the reflection position coordinates A′ of the target ball using the optical reflection formula A′=RA, and place the target ball at the reflection position coordinates A′, where R is the action matrix of the plane mirror;

[0026] Step 4: Adjust the external second centering device 2 to focus it onto the target ball at the reflection position coordinate A′;

[0027] Step 5: Remove the sphere center image 5 and the target ball at the reflection position coordinate A′, install and adjust the plane mirror 4, observe the reflected sphere center image 6 reflected by the spherical mirror fixture 3 onto the plane mirror 4 through the external second centering device 2, and adjust the plane mirror 4 until the reflected sphere center image 6 coincides with the reflection position coordinate A′, thereby completing the installation and calibration of the plane mirror 4.

Claims

1. A method for aligning a plane mirror, characterized in that, Includes the following steps: Step 1: Set up a spherical mirror fixture (3) in the optical system, and use the spherical mirror fixture (3) and the external first centering device (1) to determine the spherical center image (5) of the spherical mirror fixture (3); In the optical system, a spherical mirror fixture (3) is set up. A light wave is emitted to the spherical mirror fixture (3) by an external first centering device (1). After being reflected by the spherical mirror fixture (3), the external first centering device (1) is adjusted so that its focal point coincides with the spherical center image (5) of the spherical mirror fixture (3), thereby determining the spherical center image (5) of the spherical mirror fixture (3). Step 2: Place the target ball at the position of the center image (5), and determine the position coordinates A of the target ball using a coordinate measuring device; Step 3: Based on the theoretical position of the plane mirror (4) to be installed, calculate the reflection position coordinates A' of the target ball using the optical reflection formula, and place the target ball at the reflection position coordinates A'. The optical reflection formula is calculated as: A´=RA, Where R is the action matrix of the plane mirror (4); Step 4: Adjust the external second centering device (2) to focus it onto the target ball at the reflection position coordinate A'; Step 5: Remove the sphere center image (5) and the target ball at the reflection position coordinate A', install and adjust the plane mirror (4), observe the reflected sphere center image (6) reflected by the spherical mirror fixture (3) onto the plane mirror (4) through the external second centering device (2), adjust the plane mirror (4) until the reflected sphere center image (6) coincides with the reflection position coordinate A', thereby completing the installation and calibration of the plane mirror (4).

2. The method for calibrating a plane mirror according to claim 1, characterized in that: The first centering device (1) and the second centering device (2) are both autocollimating microscopes or spherical interferometers.

3. The method for calibrating a plane mirror according to claim 2, characterized in that: The coordinate measuring device mentioned in step two is a coordinate measuring machine or a laser tracker.

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