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Method and device for measuring modulation transfer function of telephoto lens through concave mirror imaging

A technology of modulation transfer function and imaging measurement, which is applied in the direction of measuring devices, optical instrument testing, and testing optical performance, etc. It can solve the problems that the small field of view telephoto lens cannot be measured and the measurement speed is fast, and achieves fast measurement speed and simple structure , The effect of low manufacturing cost

Active Publication Date: 2017-02-01
FUZHOU ICAMSYS PHOTOELECTRIC TECH
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Problems solved by technology

[0004] The object of the present invention is to overcome the above disadvantages, to provide a method for measuring the modulation transfer function of a telephoto lens by concave mirror imaging and a device for realizing the method. The method and device use a plurality of image sensors to share a concave mirror as an optical imaging The lens can be used for the measurement of the multi-point modulation transfer function of the telephoto lens with a small field of view. It not only has a fast measurement speed, but also solves the problem that the telephoto lens with a small field of view cannot be measured due to the structural interference of multiple optical lenses.

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  • Method and device for measuring modulation transfer function of telephoto lens through concave mirror imaging
  • Method and device for measuring modulation transfer function of telephoto lens through concave mirror imaging

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specific Embodiment approach 1

[0038] Such as Figure 1-4 As shown, the method for measuring the modulation transfer function of a telephoto lens by imaging a concave mirror provided by the present invention comprises the following steps:

[0039] ①Place the light source 1, uniform light plate 2 and reticle 3 on the image side of the lens 4 under test and arrange them in sequence from far to near along the incident optical axis of the lens 4 under test. The reticle 3 is engraved with There are multiple groups of discrimination rate unit patterns composed of black and white thin lines arranged in the meridional and sagittal directions of different line pairs;

[0040] ② Place a concave reflector 5 with a focal length greater than the focal length of the lens under test 4 on the object side of the lens under test 4, so that the concave reflector 5 cooperates with the lens under test 4 to form an enlarged optical path, and the reflection of the concave reflector 5 Facing the optical axis of the lens under tes...

specific Embodiment approach 2

[0050] Such as Figure 1-4 As shown, it is a device for realizing the method for measuring the modulation transfer function of a telephoto lens by concave mirror imaging provided by the present invention. The direction of the incident optical axis of the lens 4 is a light source 1, a uniform light plate 2, and a reticle 3 arranged in sequence from far to near. The reticle 3 is engraved with multiple groups of black and white lines arranged in the meridional and sagittal directions of different line pairs. The discrimination rate unit pattern composed of thin lines, the device also includes a position adjustment device for adjusting the position of the reticle 3 relative to the lens 4 under test, and a device arranged on the object side of the lens under test for cooperating with the lens 4 under test to form a A concave reflector 5 for enlarging the optical path, a plurality of image sensors 6 distributed on the focal plane of the concave reflector 5 according to the measureme...

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Abstract

The invention relates to a method for measuring a modulation transfer function of a telephoto lens through concave mirror imaging, and a device for realizing the method. The method comprises the following steps: 1) arranging a light source, a light uniform plate and a reticle at an image side of a detected lens; 2) arranging a concave reflection mirror at an object side of the detected lens; 3) distributing a plurality of image sensors on a focal plane of the concave reflection mirror; 4) adjusting the position of the reticle and the position of the detected lens until the reticle is arranged in the focal plane of the detected lens; 5) calculating MTF values corresponding to different line pair densities through corresponding digital image processing units; and 6) generating a modulation transfer function curve of the detected lens through an MTF data analyzer. The method and device adopt a mode that a plurality of image sensors share one concave reflection mirror as the optical imaging lens, can be used for small-field-angle telephoto lens multi-point modulation transfer function measurement, not only are fast in measurement speed, but also solve the problem that the small-field-angle telephoto lens cannot be measured due to structure interference of a plurality of optical lenses.

Description

technical field [0001] The invention relates to the field of optoelectronic integration, in particular to a method for measuring the modulation transfer function of a telephoto lens by imaging with a concave mirror and a device for realizing the method. Background technique [0002] The modulation transfer function measurement of the telephoto lens, the current method is to use the same collimator lens camera at different angle positions, use the magnification method to measure the pattern on the image surface of the lens under test, and obtain the image sensor surface of the lens under test through data analysis. The modulation transfer function of position. A typical product using this method is ImageMasterUniversal from Trioptics, Germany. When using this product to measure an optical lens, it is necessary to move the angle of the collimator camera relative to the measured lens to a predetermined position and then start the measurement. When there are many positions to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
CPCG01M11/0292
Inventor 黄志亮林大钦江化嫏高艳王昆
Owner FUZHOU ICAMSYS PHOTOELECTRIC TECH
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