A focal plane compensation method for presetting the focal plane in a vacuum environment

Abstract

The invention discloses a focal plane compensation method for a preset vacuum environment focal plane, the method comprising the following steps: first, in the Zemax software, the air pressure value in the environmental parameters is set to 0 atmospheric pressure, the system object distance and other optical parameters are set, the system back intercept is set as the only variable, the back intercept is obtained through image quality optimization, and the variable on the back intercept is cancelled to make it fixed; then, the parameters of the collimator are input into the Zemax optical system, the previous object distance is replaced, the air pressure value in the environmental parameters is set to 1 atmospheric pressure, and the distance between the collimator light source and the main surface of the collimator is set as the only variable for image quality optimization; finally, the light source distance obtained after optimization is compared with the focal length of the collimator, and the focal plane of the preset vacuum focal plane is compensated under normal pressure conditions by adjusting the position of the collimator light source. The advantages of the invention are: the optical system is subjected to light efficiency in the laboratory atmospheric environment, and the focal plane of the preset vacuum focal plane can be compensated, so that clear imaging of the target in the vacuum environment can be achieved.

Description

Technical Field

[0001] The invention relates to the field of optics, and in particular to a focal plane compensation method for a preset vacuum environment focal plane. Background Art

[0002] When calibrating the lens, the collimator is a key instrument. It can emit approximately parallel light. As a reference light source during optical calibration, it can achieve the purpose of centering the detector and clearly imaging the infinitely distant target. During optical calibration, the mechanical axis of the lens should be parallel to the optical axis of the collimator, and then the detector to be installed should be powered on to image the parallel light emitted by the collimator. By adjusting the azimuth and pitch position of the detector, the image of the collimator is clearly located in the center of the detector. At this time, the focal plane of the camera corresponds to infinity under normal pressure.

[0003] If the target usage scenario of the camera is not in a normal pressure environment, but in a vacuum environment such as space, the back intercept of the camera in a normal pressure environment and in a vacuum environment is different due to the change in the refractive index of the lens. There are many difficulties in creating a vacuum environment for optical calibration in a ground laboratory. Therefore, a focal plane compensation method is proposed to preset the vacuum environment focal plane in a laboratory normal pressure environment. Summary of the invention

[0004] The object of the present invention is to provide a focal plane compensation method for a preset vacuum environment focal plane, so as to solve the difficulty of operating the focal plane compensation for the preset vacuum environment focal plane in an atmospheric environment such as a laboratory.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The focal plane compensation method for presetting the focal plane of a vacuum environment in a normal pressure environment such as a laboratory specifically comprises the following steps:

[0007] 1) Get the back intercept in vacuum environment. The specific steps are as follows:

[0008] 1-1) In Zemax software, set the air pressure value in the environmental parameters to 0 atmosphere, and set the system object distance and other optical parameters;

[0009] 1-2) Only set the back intercept as a variable to optimize image quality;

[0010] 1-3) After the optimization is completed, the posterior intercept is obtained and the variable is cancelled to make it fixed.

[0011] 2) Determine the moving direction and distance of the collimator light source. The specific steps are as follows:

[0012] 2-1) Input the parameters of the collimator into the Zemax optical system, replacing the previous object distance;

[0013] 2-2) Set the air pressure value in the environmental parameters to 1 atmosphere;

[0014] 2-3) The distance between the collimator light source and the main surface of the collimator is set as the only variable to optimize the image quality;

[0015] 2-4) By comparing the optimized light source distance with the focal length of the collimator, we can know how to move the collimator light source.

[0016] 3) Move the collimator light source according to the analysis results and perform optical calibration under this condition.

[0017] The advantages of the present invention are:

[0018] In a normal pressure environment such as a laboratory, through a collimator, the optical system can be focused on a target at a specific distance in a vacuum environment after optical calibration. That is, in the laboratory, the focal plane of the preset vacuum environment focal plane can be compensated through simple operations to achieve clear imaging of objects in a vacuum environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the process of the present invention.

[0021] Figure 2 It is a schematic diagram of the principle of the collimator in normal working mode, that is, the light source is at the focus.

[0022] Figure 3 This is a schematic diagram of the principle of the collimator working in a simulated vacuum environment, that is, the light source is not at the focus. DETAILED DESCRIPTION

[0023] 1) Get the back intercept in a vacuum environment. First, set the air pressure value in the environmental parameters to 0 atmospheres in the Zemax software, and set the system object distance and other optical parameters; second, only set the back intercept as a variable to optimize the image quality; finally, after the optimization is completed, the back intercept is obtained, and the variable is canceled to make it fixed.

[0024] 2) Determine the moving direction and distance of the collimator light source. First, input the collimator parameters into the Zemax optical system to replace the previous object distance; second, set the air pressure value in the environmental parameters to 1 atmosphere; then, set the distance between the collimator light source and the main surface of the collimator as the only variable for image quality optimization; finally, compare the optimized light source distance with the focal length of the collimator to know how to move the collimator light source.

[0025] 3) Move the collimator light source according to the analysis results and perform optical calibration under this condition. Figure 2As shown in the figure, the light source of the collimator is originally located at the focus of the collimator, and the collimator emits parallel light; according to the simulation results of Zemax software, the light source is moved, as shown in Figure 3 As shown, the light emitted by the collimator is non-parallel light, simulating the light emitted by an infinitely far light source in a vacuum.

[0026] The above content is a further detailed description of the present invention in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to this description. The authority of the present invention is limited by the claims, and the technologies related to the present invention obtained by the technical personnel in this field based on the methods that can be changed, reorganized, etc. according to the present invention are all within the protection scope of the present invention.

Claims

1. A focal plane compensation method for a preset vacuum environment focal plane, characterized in that: The method comprises the following steps: 1) Get the back intercept in vacuum environment, The specific steps are as follows: 1-1) In the Zemax software, set the air pressure value in the environmental parameters to 0 atmospheres, set the system object distance and related optical parameters; 1-2) Set the back intercept as a variable to optimize the image quality; 1-3) After the optimization is completed, get the back intercept, cancel the variable and make it fixed; 2) Determine the moving direction and distance of the collimator light source, The specific steps are as follows: 2-1) Input the parameters of the collimator into the Zemax optical system to replace the previous object distance; 2-2) Set the air pressure value in the environmental parameters to 1 atmosphere; 2-3) Set the distance between the collimator light source and the main surface of the collimator as the only variable for image quality optimization; 2-4) Compare and analyze the optimized light source distance and the focal length of the collimator to move the collimator light source; 3) Move the collimator light source according to the analysis results and perform optical calibration.

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