Abstract
We describe a fiber optic confocal sensor (FOCOS) system that uses an optical fiber and a lens to accurately detect the position of an object at, or close to, the image plane of the fiber tip. The fiber characteristics (diameter and numerical aperture) and optics (lens F∕# and magnification) define the span and precision of the sensor and may be chosen to fit a desired application of position and displacement sensing. Multiple measurement points (i.e., fiber-tip images) may be achieved by use of multiple wavelengths in the fiber, so that each wavelength images the fiber at a different plane due to the chromatic dispersion of the optics. Further multiplexing may be achieved by adding fibers on the optical axis. A FOCOS with multiplexed fibers and wavelengths may also be used for velocity measurements.
© 2006 Optical Society of America
Full Article | PDF ArticleMore Like This
G. Berkovic, S. Zilberman, E. Shafir, and D. Rubin
Appl. Opt. 59(10) 3183-3186 (2020)
Dong-Ryoung Lee, Suin Jang, Min woo Lee, and Hongki Yoo
Appl. Opt. 55(27) 7631-7635 (2016)
Jiaqi Zhao, Haobo Cheng, Yunpeng Feng, Saisai Yan, and Weizhe Cheng
Appl. Opt. 63(5) 1347-1354 (2024)