Modulating transfer function used for fiber endoscope testing

Meirong Lin; Fang Fang; Yu Guo; Yue Zhang; Xianghong Zhong; Baozheng Zhang

doi:10.1117/12.471662

20 September 2002 Modulating transfer function used for fiber endoscope testing

Meirong Lin, Fang Fang, Yu Guo, Yue Zhang, Xianghong Zhong, Baozheng Zhang

Proceedings Volume 4927, Optical Design and Testing; (2002) https://doi.org/10.1117/12.471662
Event: Photonics Asia, 2002, Shanghai, China

Abstract

The modulation transfer function (MTF) has been used to evaluate the image quality of the optical system. There are no papers discussing the MTF of the endoscope system. This paper discusses the image quality of the fiber endoscope system by MTF. We found that the defocus error and the discrete pixel structure of the image fiber bundle are the two main factors of influencing the system resolution. The theoretical MTF values of the fiber endoscope system at the different working distances were calculated. The highest spatial frequencies that can be distinguished by the system at the different working distances were gotten through the MTF. The theoretical results were compared with the system resolutions that were measured experimentally. We found that the agreement between theory and experiment was excellent. Finally, we suggest that the system resolutions are determined by different factors in different cases.

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Meirong Lin, Fang Fang, Yu Guo, Yue Zhang, Xianghong Zhong, and Baozheng Zhang "Modulating transfer function used for fiber endoscope testing", Proc. SPIE 4927, Optical Design and Testing, (20 September 2002); https://doi.org/10.1117/12.471662

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KEYWORDS

Modulation transfer functions

Endoscopes

GRIN lenses

Spatial frequencies

Imaging systems

Optical resolution

Structured optical fibers

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