High-resolution velocimeter based on a fiber optic Sagnac interferometer

Fang Ruan; ChinYi Liaw; Yan Zhou; Yee Loy Lam; S. H. Mei

doi:10.1117/12.369358

11 November 1999 High-resolution velocimeter based on a fiber optic Sagnac interferometer

Fang Ruan, ChinYi Liaw, Yan Zhou, Yee Loy Lam, S. H. Mei

Proceedings Volume 3897, Advanced Photonic Sensors and Applications; (1999) https://doi.org/10.1117/12.369358
Event: International Symposium on Photonics and Applications, 1999, Singapore, Singapore

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.

Citation Download Citation

Fang Ruan, ChinYi Liaw, Yan Zhou, Yee Loy Lam, and S. H. Mei "High-resolution velocimeter based on a fiber optic Sagnac interferometer", Proc. SPIE 3897, Advanced Photonic Sensors and Applications, (11 November 1999); https://doi.org/10.1117/12.369358

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KEYWORDS

Sensors

Signal detection

Modulation

Sagnac interferometers

Semiconducting wafers

Gyroscopes

Phase shift keying

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