Reflectometric fiber optic frequency-modulated continuous-wave interferometric displacement sensor

Jesse Zheng

doi:10.1117/1.2148939

1 December 2005 Reflectometric fiber optic frequency-modulated continuous-wave interferometric displacement sensor

Jesse Zheng

Author Affiliations +

Optical Engineering, Vol. 44, Issue 12, 124404 (December 2005). https://doi.org/10.1117/1.2148939

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.

©(2005) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Jesse Zheng "Reflectometric fiber optic frequency-modulated continuous-wave interferometric displacement sensor," Optical Engineering 44(12), 124404 (1 December 2005). https://doi.org/10.1117/1.2148939

Published: 1 December 2005

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