Multi-point strain and displacement sensor based on intensity-modulated light and two-photon absorption process in Si-avalanche photodiode
- Resource Type
- Conference
- Authors
- Miyazawa, Hiromasa; Nemoto, Masaya; Yamada, Yoshiki; Tanaka, Yosuke; Kurokawa, Takashi
- Source
- 2017 25th Optical Fiber Sensors Conference (OFS) Optical Fiber Sensors Conference (OFS), 2017 25th. :1-4 Apr, 2017
- Subject
- Photonics and Electrooptics
Fiber gratings
Wavelength measurement
Strain
Optical fiber sensors
Probes
Absorption
Fiber Bragg grating
fiber sensor
two-photon absorption
- Language
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.