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Optical Engineering

Reflectometric fiber optic frequency-modulated continuous-wave interferometric displacement sensor
Author(s): Jesse Zheng
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Paper Abstract

A practical reflectometric fiber optic displacement sensor is reported. The sensor is based on the principle of optical frequency-modulated continuous-wave (FMCW) interference and primarily consists of a single-mode laser diode, a Y-type fiber optic directional coupler, and a quarter-pitch gradient-index lens. The displacement of the target is determined by measuring the phase shift of the beat signal with a special signal-processing method. An accuracy of 0.02 µm in a measurement range of 1000 µm has been achieved.

Paper Details

Date Published: 1 December 2005
PDF: 5 pages
Opt. Eng. 44(12) 124404 doi: 10.1117/1.2148939
Published in: Optical Engineering Volume 44, Issue 12
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