Optical fiber white-light interferometry endoscope three-dimensional measurement system

Abstract

Provided is an optical fiber white-light interferometry endoscope three-dimensional measurement system, which comprises an optical fiber interference device and a measuring probe. The optical fiber interference device is formed by a bandwidth coupling optical fiber LED, an optical fiber coupler, piezoelectric ceramics and an optical detector. The measuring probe is formed by optical fiber interference arms and an electronic endoscope CCD. The two optical fiber interference arms are connected with the two output ends of the optical fiber coupler respectively and used for projecting interference fringes to a measured object; the electronic endoscope CCD collects fringe images modulated by the measured object; and three-dimensional measurement of a static object and a dynamic object is realized through a seven-step phase shift algorithm and a windowing Fourier transform method. The system adopts the optical fiber devices and has the advantages of small size, compact structure and good flexibility and the like; the optical fiber white-light interferometry device is utilized to project the fringes, so that fringe density can be improved, and measurement precision is improved, and the system is suitable for high-precision discontinuous surface three-dimensional shape measurement; and with the combination of the endoscope technology and the optical fiber white-light interferometry, the system is allowed to have the advantages of high flexibility and measurement precision.

Description

Technical field: [0001] The present invention relates to multidisciplinary frontier research fields such as optics, electronic technology, precision machinery, microscopic photography, etc., and specifically relates to a three-dimensional measuring system for optical fiber white light interference endoscope. Background technique: [0002] At the end of the 18th century, the German scientist Bozzine first proposed the idea of ​​the endoscope, and successfully realized the observation of the rectum and uterus inside the human body using candlelight as the light source. Since then, endoscope technology has emerged as the times require. Endoscope is a precision instrument combining opto-mechanical and electrical. It is used for tissues and structures in the body that cannot be observed by human eyes. It is widely used in industrial inspection, industrial micro-processing, medical diagnosis, minimally invasive surgery and other fields. With the rapid development of CCD preparatio...

AI Technical Summary

Problems solved by technology

[0004] To sum up, the two most widely used mainstream three-dimensional measurement endoscope technologies mainly have the following problems: the three-dimensional matching accuracy of the endoscope system using binocular stereo vision technology is not high, the measurement accuracy is not high and the point There are few cloud data; the measurement accuracy of the endoscope system using digital structured light projection phase measurement technology is limited by the resolution of the projection equipment, and its measurement accuracy is not high

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