Distortion tester

Abstract

The invention relates to a distortion tester comprising a rotary table, a light source and a micro imaging system, wherein the light source and the micro imaging system are arranged on the same optical axis and are arranged on two sides of the rotary table. The invention provides a distortion tester which has high measurement precision, high efficiency, stable structure and expandable function.

Description

technical field [0001] The invention relates to the field of optical systems, in particular to a distortion tester. Background technique [0002] It is difficult for any optical system to meet the requirements of perfect imaging, but the magnitude of the aberration is different. The distortion of the optical system will directly affect the geometric position accuracy of the imaging target. Therefore, for precision measurement cameras, such as aerial measurement cameras, ballistic measurement cameras, CCD digital cameras, etc., the size of the distortion is a decisive factor for the measurement accuracy of the camera. In order to obtain accurate geometric position images, the optical design of the camera should not only correct the distortion as much as possible, but also need to carry out precise measurement of the distortion of the actual optical system, so as to provide the correction value in use. [0003] At present, the methods for detecting distortion in China adopt ...

AI Technical Summary

Problems solved by technology

[0004] 1. Low measurement accuracy

In this method, the standard grid plate is used, and the adjustment error of the grid plate and the error of the engraving line greatly reduce the measurement accuracy; at the same time, due to direct observation by the human eye, the differences between individuals lead to aiming errors; coupled with the precision turntable The existence of factors such as angle error makes the measurement accuracy of distortion only reach ±3μm

[0005] 2. The installation and debugging work is complicated, the structure is unstable, and the test efficiency is low

Before the test, the center of the grid plate must first coincide with the optical axis of the objective lens under test. The installation and adjustment work is time-consuming and laborious. At least 3 to 5 testers are required to cooperate to complete the entire installation and adjustment work, and the stability after the adjustment is poor. , low repeatability

[0006] 3. High requirements on the operating band of the system under test

Since this method mainly relies on human eyes for aiming measurement, it is only suitable for testing optical systems in the visible light band

[0007] 4. Time-consuming and labor-intensive test data recording

In this method, all the data are manually recorded, and finally the data is input into the computer for processing. This method of recording and processing data will inevitably lead to some unnecessary gross errors.

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