摘要
FBG传感器在非均匀应力场下因光栅啁啾而产生反射谱展宽,从而影响了低采样率下高速解调的精度和稳定性。针对这个问题,分析了造成异形反射谱的原因,阐述了在反射谱展宽效应下FBG的高速解调原理。通过实验,对比了高斯拟合、B样条插值以及三次样条插值三种算法的寻峰效果;根据误差理论,结合实验结果,给出了三种寻峰算法在此种情况下的均方差(MSE)以及最大峰值误差(MPE)。结果表明,当FBG传感器反射谱展宽时,三次样条插值算法有更好的稳定性。
FBG sensor＇s chirp cause the reflection spectrum broadening effect due to uneven strain distribution, which reduce the accuracy and stability of high-speed interrogation in low sampling rate. The reasons that resulting ab- normity reflection spectrum is analyzed, and the principle of FBG high-speed interrogation under the reflection spectrum broadening effects is expound. The results of Gaussian fitting, B-spline interpolation and cubic spline interpolation algo- rithm by experiments are compared. According to the theory of error, the experimental results give the mean square error （MSE） and the maximum peak error（MPE） of the three peak searching algorithms. The results show that while the FBG sensor reflection spectrum broadening occurs, cubic spline interpolation algorithm has better stability.
作者
陈仲卿
娄小平
刘锋
祝连庆
CHEN Zhongqing LOU Xiaoping LIU Feng ZHU Lianqing(Beijing Engineering Research Center of Optoelectronic Information and Instruments, Beijing Key Laboratory for Optoelectronics Measurement Technology, Beijing Information Science and Technology University, Beijing 100016, China Beijing Laboratory for Biomedical Detection Technology and Instrument, Beijing Information Science and Technology University, Beijing 100192, China)
出处
《光学技术》
CAS
CSCD
北大核心
2017年第1期7-11,共5页
Optical Technique
基金
长江学者和创新团队发展计划(IRT1212
光电信息与仪器)
北京市重大科技计划项目(Z151100003615010)
北京市属高等学校创新团队发展计划项目资助(IDHT20130518)
关键词
光纤光学
FBG传感器
低采样
反射谱展宽
寻峰算法
fiber optics
fiber Bragg grating sensor
low sampling
reflection spectrum broadening
peak-detection algorithm
