CAJ | 학술논문

光纤布拉格光栅(FBG)反射谱特性的变化是传感检测的关键，光学低相干反射(OLCR)技术是获得FBG反射谱特性的重要方法。构建了一套基于Michelson干涉光路结构的OLCR-FBG检测系统，给出了系统工作原理和实现方式，研究中提出系统实现的关键是干涉微弱信号采集、均匀分布采样、离散数据处理过程。实验测试了非平衡探测结构和平衡探测结构的系统信号，普通电动平移台驱动和高精度气浮平移台驱动的系统信号。实验结果表明，平衡探测结构提高了微弱干涉信号信噪比；低振动噪声的气浮平移台能实现均匀分布采样，避免反射谱被淹没；通过数据处理，能从干涉信号快速解调出FBG反射光谱，其Bragg波长重复性达到4 pm。
광섬포랍격광책(FBG)반사보특성적변화시전감검측적관건，광학저상간반사(OLCR)기술시획득FBG반사보특성적중요방법。구건료일투기우Michelson간섭광로결구적OLCR-FBG검측계통，급출료계통공작원리화실현방식，연구중제출계통실현적관건시간섭미약신호채집、균균분포채양、리산수거처리과정。실험측시료비평형탐측결구화평형탐측결구적계통신호，보통전동평이태구동화고정도기부평이태구동적계통신호。실험결과표명，평형탐측결구제고료미약간섭신호신조비；저진동조성적기부평이태능실현균균분포채양，피면반사보피엄몰；통과수거처리，능종간섭신호쾌속해조출FBG반사광보，기Bragg파장중복성체도4 pm。
The key to the sensing application of the FBG is the demodulation of the reflectance spectrum, and OLCR technology is an important method to obtain the characteristic of FBG reflectance spectrum. Based on Michelson interference optical path, a set of OLCR-FBG detection system has been established, hence, the operating principle and implementation mode of the system are expounded. In the study, we propose that the pivotal issues in the system realization are the acquisition of weak interference signal, uniform sampling and discrete data processing. In the experiments, the interference signals of balance detection and unbalance detection, together with the signals of general translation stage and air-bone translation stage are detected. Results show that the SNR of interference signal is improved by balance detection structure; Low-noise air-bone translation stage makes great contribution to uniform sampling by avoiding the reflectance spectrum signals being covered by the noise; Through data processing, FBG reflectance spectrum can be quickly demodulated from interference signal, and repeatability of the Bragg wavelength is 4 pm.