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报道了一种基于光纤环形激光器和旋转折变型长周期光纤光栅(R-LPFG)对的高分辨率扭曲传感器。激光器的环形腔中包含由一对相同R-LPFG)形成的Mach-Zehnder干涉仪(MZI)。R-LPFG是利用CO2激光器在扭曲单模光纤(SMF)上写入的,通过激光器输出波长的漂移量及漂移方向可以实现对施加在MZI上的扭曲量和扭曲方向的同时测量。由于激光器的输出具有线宽窄和对比度高的优点,因此本文的扭曲传感器比普通的无源扭曲传感器测量更加精确。该扭曲传感器在±100rad/m范围内的灵敏度为0.084nm/(rad/m);当光谱仪(OSA)的分辨率为10pm时,传感器的扭曲分辨率可达0.12rad/m。
A high resolution distortion sensor based on a fiber ring laser and a rotationally modified long-period fiber grating (R-LPFG) pair is reported. The Mach-Zehnder interferometer (MZI) formed by a pair of the same R-LPFGs is contained in the annular cavity of the laser. R-LPFG is written on a twisted single-mode fiber (SMF) using a CO2 laser. Simultaneous measurement of the amount of twist and the direction of twist applied to the MZI can be achieved by the amount and direction of the laser output wavelength drift. Since the output of the laser has the advantages of narrow linewidth and high contrast, the distortion sensor in this paper is more accurate than the ordinary passive distortion sensor measurement. The distortion sensor has a sensitivity of 0.084 nm / (rad / m) over a range of ± 100 rad / m and a twisting resolution of up to 0.12 rad / m when the resolution of an OSA is 10 pm.