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Proceedings Paper

High-resolution velocimeter based on a fiber optic Sagnac interferometer
Author(s): Fang Ruan; ChinYi Liaw; Yan Zhou; Yee Loy Lam; S. H. Mei
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Paper Abstract

In this paper, we report a Sagnac interferometer based velocimeter with a resolution of 0.3micrometers /s. The sensor is constructed from commercially available telecommunication single mode fibers. A sensing probe is inserted on one side of the Sagnac loop to illuminate a test surface and to couple light back to the coil. Nonreciprocal phase shift appears between the counter-propagating waves when the surface is moving away or towards the sensing probe. A number of single-no-noise-ratio enhancing techniques have been employed and a nanopositioner is also used to provide a known velocity to test the sensor response. Our experimental result have shown a linear relationship between the applied velocity and the senor response within the nanopositioner restricted measurement range of 20micrometers /s.

Paper Details

Date Published: 11 November 1999
PDF: 8 pages
Proc. SPIE 3897, Advanced Photonic Sensors and Applications, (11 November 1999); doi: 10.1117/12.369358
Show Author Affiliations
Fang Ruan, Nanyang Technological Univ. (Singapore)
ChinYi Liaw, Nanyang Technological Univ. (Singapore)
Yan Zhou, Nanyang Technological Univ. (Singapore)
Yee Loy Lam, Nanyang Technological Univ. (Singapore)
S. H. Mei, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 3897:
Advanced Photonic Sensors and Applications
Robert A. Lieberman; Anand Krishna Asundi; Hiroshi Asanuma, Editor(s)

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