摘要
A fiber sensor system based on high-birefringence optical fiber and a frequency-stabilized He-Ne Zeeman laser (λ = 0.6328 μm) has been demonstrated. The small path-length changes of interest are extracted from the amplitude or phase of the laser beat frequency by using either the phase-sensitive detection or the phase-demodulation technique. A minimum detectable optical phase delay of 1.5 x 10 -6 rad/Hz 1/2 or 17 x 10 -6 rad/Hz 1/2 has been achieved. © 1992 Optical Society of America.