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与通常的基于光谱分析的光纤布拉格光栅(FBG)传感器的原理不同,提出一种利用FBG的偏振相关损耗(PDL)特性来实现横向压力测量的新方法,从理论和实验两方面研究了FBG在横向压力作用下PDL参数的响应机制,建立了利用PDL实现横向压力传感的理论模型并进行了数值模拟。理论分析表明,FBG的PDL对横向压力的响应非常敏感,在小压力条件下比单纯的光谱分析更适合于测量横向应力。实验中在0~180 N的横向压力条件下,以PDL随波长变化曲线的质心高度和两峰值的波长间隔分别作为编码实现了解调,获得了在小压力(0~80 N)情况下0.06 dB/N和大压力(81~180 N)情况下2.5 pm/N的灵敏度,实验和理论模拟结果相符,证实了该方法的可行性。
Different from the usual principle of fiber Bragg grating (FBG) sensor based on spectral analysis, a new method to realize lateral pressure measurement by using the polarization dependent loss (PDL) characteristics of FBG is proposed. From the theoretical and experimental aspects, The response mechanism of PDL parameters under lateral pressure was established and a theoretical model of PDL pressure sensing was established and numerically simulated. Theoretical analysis shows that the PDL of FBG is very sensitive to lateral pressure and is more suitable for measuring transverse stress than simple spectral analysis under small pressure. In the experiment, under the condition of transverse pressure of 0 ~ 180 N, the PDL was demodulated as the code with the height of the centroid of the wavelength curve and the wavelength interval of the two peaks respectively. The amplitude of 0.06 dB / N and large pressure (81 ~ 180 N) 2.5 pm / N sensitivity, the experimental and theoretical simulation results, confirmed the feasibility of the method.