Multi-point strain and displacement sensor based on intensity-modulated light and two-photon absorption process in Si-avalanche photodiode

Hiromasa Miyazawa; Masaya Nemoto; Yoshiki Yamada; Yosuke Tanaka; Takashi Kurokawa

doi:10.1117/12.2267460

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23 April 2017 Multi-point strain and displacement sensor based on intensity-modulated light and two-photon absorption process in Si-avalanche photodiode

Hiromasa Miyazawa, Masaya Nemoto, Yoshiki Yamada, Yosuke Tanaka, Takashi Kurokawa

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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103238W (2017) https://doi.org/10.1117/12.2267460
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

We propose a system for precise measurement of multi-point displacement and strain using fiber Bragg grating (FBG) sensors along with intensity-modulated light and two-photon absorption process in a Si-avalanche photodiode (Si-APD). This method sweeps both the optical wavelength and the phase difference between the two modulation signals. The FBGs’ reflection spectra and their change due to strain are successfully observed at the same time with the precision measurement of the FBG’s displacement, where the relative measurement uncertainty is 10^-4. This fiber sensing system is especially suitable for structural health monitoring.

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Hiromasa Miyazawa, Masaya Nemoto, Yoshiki Yamada, Yosuke Tanaka, and Takashi Kurokawa "Multi-point strain and displacement sensor based on intensity-modulated light and two-photon absorption process in Si-avalanche photodiode", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103238W (23 April 2017); https://doi.org/10.1117/12.2267460

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