MTF test apparatus and method for small off-axis optical system

Abstract

The invention provides an MTF test apparatus and method for a small off-axis optical system. The apparatus is mainly composed of a collimator, an MTF detection system, a planar reflector and a two-dimensional rotating mechanism, wherein the two-dimensional rotating mechanism is in rigid connection with the plane reflector, the collimator and the MTF detection system are located at the same optical axis, and the plane reflector is located between the collimator and the MTF detection system. With the MTF test apparatus and method for the small off-axis optical system of the invention adopted, a test adjustment mechanism is simplified greatly, and is convenient to operate; and the plane reflector and an optical system to be tested form a test module, and therefore, a series of optical performance modular tests can be carried out, and operation procedures can be simplified, and test efficiency can be improved.

Description

Technical field [0001] The invention belongs to the technical field of optical measurement, and particularly relates to an MTF test device and method for a small off-axis optical system. Background technique [0002] With the continuous advancement of processing technologies such as injection molding and turning, complex free-form surface prism structures are more and more widely used in the design of optical systems. This structure is often off-axis asymmetrical. The mechanical adjustment structure of common MTF test equipment is aimed at the coaxial symmetrical optical system. The collimator, the lens to be tested and the detection system are on the same optical axis. The adjustment device used for field angle measurement can only be one. The small angle adjustment in the three-dimensional direction cannot directly perform off-axis optical system measurement with a large angle between the incident optical axis and the exit optical axis; and the MTF measurement of different fiel...

AI Technical Summary

Problems solved by technology

The mechanical adjustment structure of the common MTF test equipment is aimed at the coaxial symmetrical optical system. The collimator, the lens to be tested and the detection system are on the same optical axis, and the adjustment device used to measure the field of view can only be in one position. Small angle adjustment in the one-dimensional direction makes it impossible to directly measure the off-axis optical system with a large angle between the incident light axis and the outgoing light axis; and the MTF measurement of different field angles is mainly aimed at the one-dimensional direction of the field of view that can represent the entire image plane The rotationally symmetric optical system cannot sample every field of view point of the asymmetric system

To use the existing MTF test equipment to complete the measurement of off-axis asymmetric free-form prisms, it is necessary to build a mechanical adjustment mechanism that can rotate in two dimensions. This adjustment mechanism also needs to carry the load to be tested while completing the two-dimensional rotation. The optical system, the MTF detection system, and the mechanical adjustment frame of the MTF detection system are large in size, complex in structure, and relatively expensive

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