TY - JOUR
T1 - High-resolution velocimeter based on a fiber optic Sagnac interferometer
AU - Ruan, F.
AU - Liaw, C. Y.
AU - Zhou, Y.
AU - Lam, Y. L.
AU - Mei, S. H.
PY - 1999
Y1 - 1999
N2 - In this paper, we report a Sagnac interferometer based velocimeter with a resolution of 0.3 μm/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 signal-to-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 results have shown a linear relationship between the applied velocity and the sensor response within the nanopositioner restricted measurement range of 20 μm/s.
AB - In this paper, we report a Sagnac interferometer based velocimeter with a resolution of 0.3 μm/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 signal-to-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 results have shown a linear relationship between the applied velocity and the sensor response within the nanopositioner restricted measurement range of 20 μm/s.
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M3 - Conference article
AN - SCOPUS:0033335461
SN - 0277-786X
VL - 3897
SP - 597
EP - 604
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
T2 - Proceedings of the 1999 Advanced Photonic Sensors and Applications
Y2 - 30 November 1999 through 3 December 1999
ER -