激光与光电子学进展, 2020, 57 (5): 050602, 网络出版: 2020-03-05   

光载微波干涉光子晶体光纤传感系统实验研究 下载: 1167次

Experimental Study on Photonic Crystal Fiber Sensing System Based on Optical-Borne Microwave Interference
作者单位
1 武汉理工大学光纤传感技术国家工程实验室, 湖北 武汉 430070
2 武汉理工大学机电工程学院, 湖北 武汉 430070
摘要
针对目前光子晶体光纤传感器存在对模间干涉敏感、难以封装等问题,搭建了一种基于光载微波干涉的光子晶体光纤传感系统。系统干涉发生在光载波的微波包络之间,光不发生干涉,光波的偏振衰落、色散、模间干涉等对系统的信号质量影响很小,因此不需要对系统中光子晶体光纤进行特殊处理,且该系统对加工精度要求较低。分别对系统进行了应变与高温传感实验。应变实验结果表明:微波域干涉条纹可见度为20 dB,8 GHz处应变测量灵敏度为6.3 kHz/με,微应变测量分辨率可达1.59 με。温度实验结果表明:系统在室温到800 ℃温度范围内的温度测量灵敏度为76.04 kHz/℃,理论上温度测量分辨率可达0.13 ℃,通过多组长度探头的温度实验证明系统具有良好的温度灵敏度与稳定性。
Abstract
A photonic crystal fiber sensing system based on optical-borne microwave interference is built to solve the problem that the current photonic crystal fiber sensor is sensitive to inter-mode interference and difficult to package. The system interference occurs between the microwave envelopes of the optical carriers, the light does not interfere, and the polarization fading, dispersion, and inter-mode interference of the optical waves have a little effect on the signal quality. Therefore, the system does not require special processing for the photonic crystal fiber, with low requirements of the processing accuracy. Strain and high temperature sensing experiments are carried out on the system. The strain test results show that the visibility of interference fringe in microwave domain can reach 20 dB, the strain measurement sensitivity at 8 GHz is 6.3 kHz/με, and the resolution of the microstrain measurement is 1.59 με. The temperature experimental results show that temperature measurement sensitivity of system is 76.04 kHz/℃ from room temperature to 800 ℃, and the theoretical temperature measurement resolution is 0.13 ℃. Temperature experiments using multiple sets of length probes prove that the system has good temperature sensitivity and stability.

梁斯靖, 周次明, 范典, 李宇潇, 庞彦东, 陈希. 光载微波干涉光子晶体光纤传感系统实验研究[J]. 激光与光电子学进展, 2020, 57(5): 050602. Sijing Liang, Ciming Zhou, Dian Fan, Yuxiao Li, Yandong Pang, Xi Chen. Experimental Study on Photonic Crystal Fiber Sensing System Based on Optical-Borne Microwave Interference[J]. Laser & Optoelectronics Progress, 2020, 57(5): 050602.

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