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Sensors and Materials, Volume 33, Number 4(3) (2021)
Copyright(C) MYU K.K.
pp. 1431-1442
S&M2545 Research Paper
https://doi.org/10.18494/SAM.2021.3302
Published: April 20, 2021

Polarization-insensitive Simultaneous Measurement of Torsion and Temperature Using Long-period Fiber Grating Written on Polarization-maintaining Photonic Crystal Fiber [PDF]

Do Kyung Kim, Jinsil Han, and Yong Wook Lee

(Received January 21, 2021; Accepted February 19, 2021)

Keywords: optical fiber sensors, long-period fiber grating, polarization-maintaining photonic crystal fiber, Faraday rotator mirror, torsion, temperature

Here, we report a novel optical fiber grating sensor capable of simultaneous measurement of torsion and temperature by utilizing a long-period fiber grating (LPFG) written on a polarization-maintaining photonic crystal fiber (PMPCF) and a Faraday rotator mirror (FRM) concatenated in series with the LPFG. The LPFG written on the PMPCF, referred to as a PMPC-LPFG, which is connected in series with the FRM, exhibits a polarization-independent wavelength-dependent loss spectrum in its reflection spectrum, which has two attenuation dips (ADs) designated as AD 1 and AD 2. When these two ADs have different cladding-mode orders, they have different torsion responses as well as temperature responses. For the two ADs with resonance wavelengths of λ1 = ~1508.02 nm and λ2 = ~1533.48 nm, torsion and temperature responses were investigated in a twist angle range from −70 to 70° (step: 10°) and an ambient temperature range from 25 to 95 °C (step: 10 °C), respectively. The torsion sensitivities of AD 1 and AD 2 were measured as ~157.0 and ~272.7 pm/rad at room temperature, and their temperature sensitivities were measured as ~5.8 and ~8.2 pm/°C, respectively. Owing to their linear and independent responses to torsion and temperature, torsion and temperature changes applied to the PMPC-LPFG can be simultaneously evaluated from the measured wavelength shifts of AD 1 and AD 2 using their predetermined torsion and temperature sensitivities.

Corresponding author: Yong Wook Lee


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Cite this article
Do Kyung Kim, Jinsil Han, and Yong Wook Lee, Polarization-insensitive Simultaneous Measurement of Torsion and Temperature Using Long-period Fiber Grating Written on Polarization-maintaining Photonic Crystal Fiber, Sens. Mater., Vol. 33, No. 4, 2021, p. 1431-1442.



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