This paper presents an approach for simultaneous measurement of temperature and pressure using miniaturized fiber inline sensors. The approach utilizes the cascaded optical fiber inline intrinsic Fabry-Perot interferometer and extrinsic Fabry-Perot interferometer as temperature and pressure sensing elements, respectively. A CO2 laser was used to create a loss between them to balance their reflection power levels. The multiplexed signals were demodulated using a Fast Fourier transform-based wavelength tracking method. Experimental results showed that the sensing system could measure temperature and pressure unambiguously in a pressure range of 0 to 6.895 x 105 Pa and a temperature range from 20°C to 700°C.
Y. Zhang et al., "Simultaneous Measurement of Temperature and Pressure with Cascaded Extrinsic Fabry-Perot Interferometer and Intrinsic Fabry-Perot Interferometer Sensors," Optical Engineering, vol. 53, no. 6, SPIE, Jun 2014.
The definitive version is available at https://doi.org/10.1117/1.OE.53.6.067101
Electrical and Computer Engineering
National Energy Technology Laboratory (U.S.)
Keywords and Phrases
Carbon dioxide; Fast Fourier transforms; Fiber optic sensors; Optical fibers; Pressure; Temperature; Extrinsic Fabry Perot interferometer; Intrinsic Fabry-Perot interferometers; Multiplexed signals; Sensing systems; Simultaneous measurement; Temperature and pressures; Temperature range; Wavelength tracking; Optical variables measurement
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01 Jun 2014