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

Yuta Ohashi; Shinya Takemae; Yosuke Tanaka

doi:10.1117/12.2542645

12 November 2019 Fiber-interferometer-based dynamic displacement sensor with triangle and stepwise phase modulation on the reference light

Yuta Ohashi, Shinya Takemae, Yosuke Tanaka

Author Affiliations +

Proceedings Volume 11197, SPIE Future Sensing Technologies; 111970P (2019) https://doi.org/10.1117/12.2542645
Event: SPIE Future Sensing Technologies, 2019, Tokyo, Japan

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.

Citation Download Citation

Yuta Ohashi, Shinya Takemae, and Yosuke Tanaka "Fiber-interferometer-based dynamic displacement sensor with triangle and stepwise phase modulation on the reference light", Proc. SPIE 11197, SPIE Future Sensing Technologies, 111970P (12 November 2019); https://doi.org/10.1117/12.2542645

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