我们以双频光纤光栅激光器为传感元件，通过对激光器输出的拍频信号进行监测，最近几年来已经实现了对侧向压力、振动、声波等外界扰动的测量。对于静态和准静态测量来说，探测能力受限于拍频信号的低频噪声。我们最近系统研究了泵浦光偏振态和腔外光反馈等因素对拍频信号噪声特性的影响机理，并以此为基础实现了拍频信号低频噪声的有效抑制，提升了信号输出的稳定性。拍频信号频率浮动从1.5MHz降低到5kHz，从而大幅提升了传感器的探测能力。在最近的第23届OFS会议上，我们报道了采用双频光纤光栅激光器进行微小重量探测的结果，最小重量分辨率为0.28毫克。

相关文章：

1.Yizhi Liang, Qiang Yuan, Long Jin, Linghao Cheng, and Bai-Ou Guan, “Effect of pump light polarization and beat note stabilization for dual-polarization fiber grating laser sensors,” IEEE Journal of Selected Topics in Quantum Electronics, vol. 20, no. 5, Art. No. 5600208, 2014.

2.Yizhi Liang, Qiang Yuan, Long Jin, Linghao Cheng, and Bai-Ou Guan, “Detection of an extremely small mass with a dual-polarization fiber grating laser,” 23th International Conference on Optical Fiber Sensors, Proc. SPIE, vol. 9157, Art. No. 91571C, 2014.