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Proceedings Paper

Polarimetric fiber vibration sensor based on polarization-diversity loop structure
Author(s): Kyoungsoo Park; Young Suk Kim; Songhyun Jo; Yong Wook Lee
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Paper Abstract

Here, we demonstrated a polarimetric fiber vibration sensor based on a polarization-diversity loop structure (PDLS) by using polarization-maintaining photonic crystal fiber (PM-PCF). The PDLS is composed of a polarization beam splitter, PM-PCF, and polarization controllers, forming a Sagnac birefringence interferometer (SBI) that has periodic interference spectra. When static strain is applied to PM-PCF used as a sensor head, spectral shift is observed in the output interference spectrum of the SBI of the sensor. If a monochromatic light source such as a laser diode is introduced into the SBI, the output optical power of the SBI is determined by its wavelength-dependent transmittance. If the wavelength of the light source is properly located at a spectral region where the transmittance of the SBI linearly varies, therefore, the magnitude of strain applied to PM-PCF can be found by observing the output voltage variation of a photodetector connected to the output port of the SBI. To investigate the vibration response of the proposed sensor with respect to various types of vibration, vibration diverse in the amplitude and frequency was applied to 8-cm-long PM-PCF by using a cylindrical piezoelectric transducer or a metal cantilever. First, vibration characteristics were examined for single frequency vibration in a range of 1−3000 Hz. Then, the sensor response to naturally damped vibration was explored. It was experimentally observed that the cut-off frequency was ~1900 Hz in the frequency response, and the peak value of the sensor output signal increased with the amount of impulse for naturally damped vibration.

Paper Details

Date Published: 8 July 2015
PDF: 6 pages
Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 965506 (8 July 2015); doi: 10.1117/12.2184133
Show Author Affiliations
Kyoungsoo Park, Pukyong National Univ. (Korea, Republic of)
Young Suk Kim, Pukyong National Univ. (Korea, Republic of)
Songhyun Jo, Pukyong National Univ (Korea, Republic of)
Yong Wook Lee, Pukyong National Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 9655:
Fifth Asia-Pacific Optical Sensors Conference
Byoungho Lee; Sang-Bae Lee; Yunjiang Rao, Editor(s)

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