Alternate dual pulses technique for fiber Bragg grating Ultra-multi-point strain measurement
The research of ultra-multi-point strain detection is one of the important topics at the forefront of optical fiber sensing technology.A newly ultra-multi-point strain measurement system was designed based on optical time-domain reflectometry (OTDR) and Fiber Bragg Grating.Two distributed feedback (DFB) lasers is proposed as laser source to generate the alternately pulsed light,and transmitted to a serial of fiber Bragg gratings with the same low-reflectivity and bandwidth.By the means of the strength of each reflectance spectrum and its return time of signals,the magnitude and location of strain can be accurately determined,and the numerical simulation shows that more than 1000 FBGs can be multiplexed in OTDR-FBG strain measurement system for a larger strain measurement range.Furthermore,the corresponding driving circuits for nanosecond pulse and temperature control circuits are designed for laser pulse modulation and frequency stabilization control.A OTDR-FBG strain measurement system is developed by using 10 FBGs with the reflectivity of less than 5%,and the system distance resolution of 43 cm is obtained,which verified the feasibility of the system.
Fiber Bragg grating (FBG) OTDR dual DFB lasers Ultra multi-point strain measurement
Xin Gong Dengxin Hua Pengbo Zhang Liaolin Hu Yufeng Wang
School of Mechanical and Precision Instrument Engineering, Xian University of Technology, Xian 710048, China
国际会议
2012第八届精密工程测量和仪器仪表国际研讨会(ISPEMI2012)
成都
英文
1-6
2012-08-08（万方平台首次上网日期，不代表论文的发表时间）