Pressure sensing of Fabry-Perot interferometer with a microchannel demodulated by a FBG

Yongqin Yu; Xue Chen; Quandong Huang; Chenlin Du; Shuangchen Ruan

doi:10.1117/12.2184434

1 July 2015 Pressure sensing of Fabry-Perot interferometer with a microchannel demodulated by a FBG

Yongqin Yu, Xue Chen, Quandong Huang, Chenlin Du, Shuangchen Ruan

Proceedings Volume 9655, Fifth Asia-Pacific Optical Sensors Conference; 96550M (2015) https://doi.org/10.1117/12.2184434
Event: Fifth Asia Pacific Optical Sensors Conference, 2015, Jeju, Korea, Republic of

Abstract

A novel and compact fiber-probe pressure sensor was demonstrated based on micro Fabry-Perot interferometer (FPI). The device was fabricated by splicing both ends of a short section simplified hollow-core photonic crystal fiber (SHCPCF) with single mode fibers (SMFs), and then a micro channel was drilled by femtosecond laser micromachining in the SHC-PCF to significantly enhance the pressure sensitivity. The pressure sensing characteristics based on micro-FPI have been investigated by measuring the signals through the demodulation of phase since the external signal imposing on the interferometer will induce the phase change of interference signal. Then a FBG was cascaded to demodulate the signal. A micro FPI demonstrates a maximum pressure sensitivity of 32 dB/MPa, while a low temperature cross-sensitivity of 0.27 KPa/°C. Hence it may have potential for pressure applications in harsh environment.

Citation Download Citation

Yongqin Yu, Xue Chen, Quandong Huang, Chenlin Du, and Shuangchen Ruan "Pressure sensing of Fabry-Perot interferometer with a microchannel demodulated by a FBG", Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 96550M (1 July 2015); https://doi.org/10.1117/12.2184434

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KEYWORDS

Sensors

Fiber Bragg gratings

Single mode fibers

Fiber optics sensors

Fabry–Perot interferometry

Photonic crystal fibers

Interferometers

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