Abstract
The simultaneous measurement of temperature and pressure using the reflected light of two high birefringent fibers is studied. These two fibers are spliced and twisted 45 degrees. The resulting spectrum contains the interference caused by the birefringence of each fiber, and the differential and sum of the frequency. The obtained spectrum is processed with a band-pass filter to get the spectrum of each fiber. The pressure and the temperature are demodulated using the peak-tracking method. As a result, the pressure and the temperature sensitivity of these individual fibers are obtained as 3.2nm/MPa and -1.6nm/K for the PANDA fiber, and 3.2nm/MPa and negligible temperature sensitivity for the PM-PCF. This method produces an easily encapsulated, highly sensitive temperature and pressure sensor without any additional type of sensor.
Highlights
Polarization maintaining fiber (PMF)s are broadly used as telecommunication devices, and applied as inline interferometric sensors due to their feature of birefringence
We investigated applying a serially connected photonic crystal fiber (PCF) and PMF to simultaneously measure pressure and temperature with a single end configuration
The birefringence of the polarization maintaining (PM) fibers causes an optical path difference (OPD) between two polarization modes, one is called fast mode and the other is called slow mode, results in a complex interference pattern on the spectrum obtained on the optical spectrum analyzer (OSA)
Summary
Polarization maintaining fiber (PMF)s are broadly used as telecommunication devices, and applied as inline interferometric sensors due to their feature of birefringence. Various studies of other measurands were conducted, such as strain and temperature, and hydrostatic pressure and temperature.. In the early ‘00s, temperature insensitive birefringent photonic crystal fiber (PCF)s became commercially available, and studies showed it was possible to measure several measurands without temperature influence.. Some specially designed PCFs were tested for extremely high sensitivity for some measurands such as hydrostatic pressure, strain, and temperature.. Recent studies showed it was possible to use a single end (reflection type) configuration for pressure and temperature sensing. We investigated applying a serially connected PCF and PMF to simultaneously measure pressure and temperature with a single end configuration. We confirmed the feasibility of simultaneously measuring pressure and temperature with a serially-connected, single-end configuration
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