CN118838052B

CN118838052B - Focal plane compensation method for preset vacuum environment focal plane

Info

Publication number: CN118838052B
Application number: CN202410875335.1A
Authority: CN
Inventors: 刘云猛; 丁雷; 楚晴; 段慧仙; 孙中洲
Original assignee: Shanghai Institute of Technical Physics of CAS
Current assignee: Shanghai Institute of Technical Physics of CAS
Priority date: 2024-07-02
Filing date: 2024-07-02
Publication date: 2025-03-11
Anticipated expiration: 2044-07-02
Also published as: CN118838052A

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

Focal plane compensation method for preset vacuum environment focal plane

Technical Field

The invention relates to the field of optics, in particular to a focal plane compensation method for a preset vacuum environment focal plane.

Background

When the lens is subjected to optical calibration, the collimator is key instrument equipment, can emit approximately parallel light, is used as a reference light source for optical calibration, and can achieve the purposes of centering a detector and clearly imaging an infinite target. When in light correction, the mechanical axis of the lens is firstly parallel to the optical axis of the collimator, then the detector to be installed is electrified to image the parallel light emitted by the collimator, the image of the collimator is clearly positioned at the very center of the detector by adjusting the azimuth pitching position of the detector, and the like, and at the moment, the focal plane of the camera corresponds to infinity under normal pressure environment.

If the target usage scene of the camera is not under the normal pressure environment but under the vacuum environment such as space, the back intercept of the camera is not the same under the normal pressure environment and under the vacuum environment due to the refractive index change of the lens and the like. There are many difficulties in creating a vacuum environment in a ground laboratory for optical correction, so a focal plane compensation method for presetting a focal plane of the vacuum environment in a laboratory normal pressure environment is provided.

Disclosure of Invention

The invention aims to provide a focal plane compensation method for a preset vacuum environment focal plane, which aims to solve the difficulty of operation of focal plane compensation of the preset vacuum environment focal plane in atmospheric environments such as laboratories.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

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

1) Obtaining the back intercept under the vacuum environment. The method comprises the following specific steps:

1-1) setting the atmospheric pressure value in the environmental parameter to 0 atmosphere in Zemax software, and setting the object distance and other optical parameters of the system;

1-2) image quality optimization is performed by setting only the back intercept as a variable;

1-3) obtaining a rear intercept after the optimization is finished, and canceling the variable to fix the variable.

2) And determining the moving direction and distance of the collimator light source. The method comprises the following specific steps:

2-1) inputting parameters of the collimator into a Zemax optical system to replace the previous object distance;

2-2) setting the air pressure value in the environmental parameter to 1 atmosphere;

2-3) taking the distance between the collimator light source and the main surface of the collimator as a unique variable to optimize the image quality;

2-4) comparing the optimized light source distance with the focal length of the collimator, and knowing how the collimator light source should be moved.

3) And moving the collimator light source according to the analysis result, and performing optical calibration under the condition.

The invention has the advantages that:

under normal pressure environment such as laboratory, through the collimator, the optical system can focus on the target of specific distance under the vacuum environment after the optical correction. The focal plane of the preset vacuum environment focal plane can be compensated through simple operation in a laboratory, so that clear imaging of objects in the vacuum environment is realized.

Drawings

The invention is further described below with reference to the accompanying drawings.

FIG. 1 is a schematic flow chart of the present invention.

Fig. 2 is a schematic diagram of the collimator in a normal operation mode, i.e. the light source is located at the focal point.

Fig. 3 is a schematic diagram of the collimator in a vacuum environment simulation mode of operation, i.e., the light source is not located at the focal point.

Detailed Description

1) Obtaining the back intercept under the vacuum environment. Firstly, setting the air pressure value in the environment parameters as 0 atmosphere in Zemax software, setting the object distance and other optical parameters of the system, secondly, setting the rear intercept as a variable for image quality optimization, and finally, obtaining the rear intercept after the optimization is finished, and canceling the variable to fix the variable.

2) And determining the moving direction and distance of the collimator light source. Firstly, inputting parameters of a collimator into a Zemax optical system to replace the previous object distance, secondly, setting the air pressure value in the environmental parameters to be 1 atmosphere, afterwards, setting the distance between a collimator light source and a main surface of the collimator as a unique variable to perform image quality optimization, and finally, comparing the optimized light source distance with the focal length of the collimator to know how the collimator light source should be moved.

3) And moving the collimator light source according to the analysis result, and performing optical calibration under the condition. The light source of the collimator is originally positioned at the focus of the collimator as shown in fig. 2, the collimator emits parallel light, the light source is moved according to the simulation result of Zemax software, and at the moment, the light emitted by the collimator is non-parallel light and simulates the light emitted by the light source at infinity under vacuum as shown in fig. 3.

The foregoing is a further detailed description of the invention in connection with specific embodiments, and is not intended to limit the practice of the invention to that description. The rights of the present invention are defined by the claims, and the technologies related to the present invention, which are obtained based on the methods that can be changed, recombined, etc. by those skilled in the art according to the present invention, are all within the 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.