Ms. Liangjun Zhang Profile

Liangjun Zhang

at Soochow Univ

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Proceedings Article | 1 December 2009 Paper

Optical design of optical transfer function instrument

Liangjun Zhang, Xinhua Chen, Yuheng Chen, Weimin Shen

Proceedings Volume 7506, 75061Z (2009) https://doi.org/10.1117/12.837943

KEYWORDS: Image analysis, Optical transfer functions, Mirrors, Collimators, Optical design, Off axis mirrors, Modulation transfer functions, Collimation, Diffraction, Microscopes

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The optical design of Optical transfer function (OTF) instrument, which is based on the image Fourier analysis method, is presented. To perform infinite conjugate testing of an optical system, the designed system is mainly composed of the object generator, lens under test, and image analyzer. The object generator offers an object at infinite distance with known spectral and spatial content. It includes the illumination system and the collimating system. The illumination system is analyzed and optimized with CODEV and LightTools software. Performance evaluation indicates that its illumination uniformity in the required area is above 95% .The collimation system based on an off-axis parabolic mirror is of the focal length of 2000mm and the entrance pupil diameter 200mm. Through optimization, the image quality of the collimator is excellent and its on-axis modulation transfer function (MTF) approaches diffraction limit. Collimated beam of the target is imaged by the lens under test. The image is magnified and acquired by image analyzer, which is made up of four parts: an infinite conjugate microscope objective, a tube lens, an eyepiece and a CCD camera. Image Results show that this designed scheme meets the requirements of this OTF instrument.

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