Birefringent Frequency-Scanning Phase-Sensitive OTDR Based Fiber-Optic Hydrostatic Pressure and Temperature Sensor

In this paper, we propose a highly sensitive distributed optical fiber sensor capable of simultaneous hydrostatic pressure and temperature sensing. By demodulating both frequency shift of Rayleigh scattering and birefringence of the polarization maintaining fiber (PMF), a sensor with 10 kPa hydrostatic accuracy and 66.5 mK temperature accuracy is demonstrated.