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Proceedings Paper

Fiber-interferometer-based dynamic displacement sensor with triangle and stepwise phase modulation on the reference light
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Paper Abstract

We demonstrate a fiber optic dynamic displacement sensing system based on an unbalanced Michelson interferometer. In this system, the phase of the reference light is modulated with triangle and stepwise waveforms. The high-frequency triangle phase modulation makes the interferometer produce a series of chevron-shaped signals. From the change in temporal width of each signal, displacement of an object is measured with high time resolution. The effect of environmentally induced instability enhanced by a relatively large path length difference is suppressed by changing the phase by the step-wise modulation. A 10-kHz vibration displacement, which had not been measured without the step-wise phase modulation, was successfully measured by using a fiber optic Michelson interferometer even with a path length difference of 1 m.

Paper Details

Date Published: 12 November 2019
PDF: 3 pages
Proc. SPIE 11197, SPIE Future Sensing Technologies, 111970P (12 November 2019); doi: 10.1117/12.2542645
Show Author Affiliations
Yuta Ohashi, Tokyo Univ. of Agriculture and Technology (Japan)
Shinya Takemae, Tokyo Univ. of Agriculture and Technology (Japan)
Yosuke Tanaka, Tokyo Univ. of Agriculture and Technology (Japan)

Published in SPIE Proceedings Vol. 11197:
SPIE Future Sensing Technologies
Masafumi Kimata; Christopher R. Valenta, Editor(s)

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