Negative lens focal length test device and test method

Abstract

The invention relates to a negative lens focal distance testing device and a testing method. The negative lens focal distance testing device comprises a light source, a target simulation system, a monitoring system and a data acquisition and processing system, wherein the target simulation system and the monitoring system are sequentially arranged on an emitted light path of the light source; the monitoring system is connected with the data acquisition and processing system; and a negative lens to be tested is arranged between the target simulation system and the monitoring system. The invention provides the negative lens focal distance testing device and the testing method which are small in error and high in measurement efficiency.

Description

technical field [0001] The invention belongs to the field of optical testing, and relates to a negative lens focal length testing device and a testing method, in particular to a telephoto negative lens focal length testing device and a testing method. Background technique [0002] Negative lens is a common optical element in photometric equipment. After its processing is completed, the focal length is an important parameter. The accuracy of the focal length processing directly affects the docking of the entire optical path. [0003] Traditional test method: For the test of the focal length of the short-focus negative lens, a test system composed of a collimator and a long working distance microscope is usually used, and the focal length is tested by the magnification method; The additional lens method is used for testing. A positive lens with a focal length longer than the negative lens is used to form a Galilean telephoto system, so that the defocus is zero. By testing its ...

AI Technical Summary

Problems solved by technology

[0003] Traditional test method: To test the focal length of a short-focus negative lens, a test system composed of a collimator and a long working distance microscope is usually used to test the focal length by the magnification method; for the test of the focal length of a long-focus negative lens, generally use The additional lens method is used for testing. A positive lens with a focal length longer than the negative lens is used to form a Galileo telescopic system, so that the defocus amount is zero. By testing its apparent magnification, the focal length of the negative lens is indirectly measured. This method requires positive and negative The lens is docked, the adjustment steps are complicated, and the main source of measurement error is the focal length error of the positive lens. This test method is time-consuming, labor-intensive, inefficient, and relatively low in accuracy.

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