A mtf test device and method for small off-axis optical system
An optical system and testing device technology, applied in the field of optical measurement, can solve the problems of complex structure, large volume, off-axis optical system measurement, etc., and achieve the effect of simple structure, low cost and small volume
Active Publication Date: 2018-12-21
BEIJING INSTITUTE OF TECHNOLOGYGY
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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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[0027] Example: The system to be tested is an asymmetric freeform prism,
[0028] Such as figure 2 As shown, the collimator 1 and the MTF detection system 3 are on the same optical axis, and the test module 6 is placed in the optical path between the two; 4 and a two-dimensional rotating mechanism 5; the two-dimensional rotating mechanism 5 is rigidly connected with the plane mirror 4.
[0029] The angle between the outgoing optical axis and the incident optical axis of the off-axis asymmetric free-form surface prism 7 to be measured is 2θ, and the placement angle of the plane reflector 4 is required to be θ between the normal direction and the horizontal direction, so that the measured The incident light axis of the off-axis asymmetric free-form surface prism 7 is parallel to the exit light axis; at the same time, the aperture of the plane mirror 4 should be large enough not to block the optical path of the off-axis asymmetric free-form surface prism 7 . The processing sur...
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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, in particular to an MTF testing device and method for a small off-axis optical system. Background technique [0002] With the continuous improvement of injection molding, turning and other processing technologies, complex free-form prism structures are more and more widely used in optical system design, and such structures are often off-axis asymmetric. 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 differe...
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IPC IPC(8): G01M11/02
Inventor 程德文胡源王涌天刘越
Owner BEIJING INSTITUTE OF TECHNOLOGYGY