Light & Engineering 30 (6)

Volume 30
Date of publication 12/19/2022
Pages 22–27

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Method of Wave-Front Characterisation in Endoscopic Probes L&E, Vol.30, No.6, 2022

Articles authors:

Anastasia A. Zolotukhina, Anastasiya V. Guryleva, Alexander S. Machikhin

Anastasia A. Zolotukhina, research engineer. She graduated from the Radio-electronics and Laser Engineering faculty of the N.E. Bauman MSTU in 2021. At present, she is research engineer at STC UI RAS and engineer at Radio-electronics and Laser Engineering Research Institute of N.E. Bauman MSTU

Anastasiya V. Guryleva, Ph. D. in Technical Sciences. She graduated from the Radio-electronics and Laser Engineering faculty of the N.E. Bauman MSTU in 2017. At present, she is researcher at STC UI RAS and assistant at the Laser and Optoelectronic Instruments sub-department of N.E. Bauman MSTU

Alexander S. Machikhin, Doctor of Technical Sciences. In 2007, he graduated from N.E. Bauman MSTU. At present, he is senior research scientist of STC UI RAS. Research interests: instrument engineering, non-destructive testing, acousto-optics, biomedical optics

Abstract:

Endoscopic instrumentation is the main means of visualisation and analysis of condition of hardto-reach cavities of different objects in medicine and engineering. The quality of images formed by endoscopic instrumentation is usually limited by geometric aberrations of its optical system. For efficient optical conjugation of endoscopic probes with an eyepiece designed for visual observation and with analytical instruments, detailed information on their aberration characteristics is required. Nowadays, there is no recognised testing methodology for such probes allowing to determine the degree of geometrical aberrations to full extent. In this work, testing was based on analysis of wave-front behind the endoscope eyepiece using a Shack-Hartmann sensor. A bench for registration and analysis of Hartman-nomograms was developed and built for: determining wave-front characteristics in geometrical optics approximation for extra-axis points; evaluation of field curvature and chromatic aberrations; calculation and accounting for measurement errors. The method is exemplified by obtaining wave-front parameters as well as angular and spectral dependences of the defocusing magnitude (characterising field curvature and chromatic aberration of position of an optical system) for a rigid lens endoscope.

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Keywords

DOI: https://doi.org/10.33383/2022-074

Article in RUS:
Svetotekhnika # 5, 2022, pp.19–23

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