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MTF test device and test method for off-axis three-mirror optical system with large field of view

An off-axis three-mirror optical system technology, applied in the field of optical inspection, can solve the problems of the difficulty of transfer function testing, the special optical path of the off-axis three-mirror optical system, and the inability to directly apply the MTF test of the off-axis three-mirror optical system. Achieve a wide range of applications

Active Publication Date: 2017-09-05
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] Since the light entrance and light exit of the general optical system are opposite and not on the same plane, but the light exit and light entrance of the off-axis three-mirror optical system are on the same plane, so that the existing commonly used transfer function test method It cannot be directly applied to the MTF test of the off-axis three-mirror optical system; in addition, the optical path of the off-axis three-mirror optical system is relatively special, which makes its transfer function test more difficult

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  • MTF test device and test method for off-axis three-mirror optical system with large field of view
  • MTF test device and test method for off-axis three-mirror optical system with large field of view

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Embodiment Construction

[0039] In order to explain the specific ideas and principles of the present invention more clearly, here we first introduce the main features of the large field of view off-axis three-mirror optical system:

[0040] Feature 1: The light entrance and light exit of the large field of view off-axis three-mirror optical system are in the same plane (the object space and the image space are on the same plane).

[0041] In the general MTF test process, it is necessary to self-adjust the optical path so as to determine the MTF accuracy of the central field of view during the test process.

[0042] The optical path self-alignment adjustment is mainly divided into two parts, one is the optical path self-alignment of the entire test device, that is, by adjusting the azimuth and pitch of the MTF test system, the reflected light path of the detector of the MTF test system is parallel to the optical axis of the MTF test system. The other part is to adjust the optical path of the measured o...

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Abstract

The invention provides an MTF test device and test method for an off-axis three-mirror optical system with a large field of view, which are easy to operate and easy to realize. The test method includes the steps of firstly determining the specific position of a plane mirror using a pentaprism and an autocollimation theodolite to ensure that the plane mirror reflects an optical path for 90 degrees so that the reflected optical path by the plane mirror enters a field of view of an off-axis three-mirror optical system under test completely; secondly, deflecting a detector of an MTF measurement system; and thirdly, finding out an exact image plane position and measuring a transfer function by the MTF measurement system.

Description

technical field [0001] The invention belongs to the field of optical detection, and relates to an MTF (transfer function) test device and a test method of an off-axis three-mirror optical system with a large field of view. Background technique [0002] The general development trend of space optical systems at home and abroad is to develop in the direction of long focal length, large field of view, light weight, small size, large relative aperture, and high imaging quality, which makes people increasingly interested in the design of reflective systems. [0003] At present, there are mainly several types of reflective systems: coaxial, coaxial and off-axis. [0004] The available field of view of the coaxial optical system is limited, the observation frame is too small, and the center is blocked, which limits the MTF of the coaxial optical system, so the development of the coaxial optical system is limited to a certain extent. [0005] Coaxial two-mirror and multi-mirror syst...

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Application Information

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IPC IPC(8): G01M11/02
CPCG01M11/0292
Inventor 胡丹丹李朝辉刘锴张洁薛勋王争锋张欢赵建科周艳陈永权刘峰徐亮刘尚阔焦璐璐曹昆
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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