A FBG Sensor System with Cascaded LPFGs and Music Algorithm for Dynamic Strain Measurement
A Mach-Zehnder (M-Z) interferometer formed by two cascaded long-period fiber gratings (LPFGs) serving as many multi-channel edge filters is used to detect the wavelength shift, induced by measurand, of fiber Bragg grating (FBG) sensors with high optical SNR of ＞60dB due to the use of a fiber ring laser, for the first time to our knowledge. Advantages of such a demodulation device are low-cost, compact, easy fabrication and implementation, good immunity of vibration and temperature, et. al. In addition, in order to improve the resolution for dynamic strain measurement, a spectral analyzing algorithm called Music modern spectrum estimation is adapted. The experimental results show that a dynamic strain resolution of 0.1με/Hz1/2 at 700Hz is obtained, which is 10 times improvement in strain resolution when compared with conventional FFT method.
FBG sensors Strain gauge Music algorithm LPFGs Edge filter Fiber ring laser.
Zeng-Ling Ran Yun-Jiang Rao
Key Lab of Broadband Optical Fiber Transmission & Communication Networks Technology (Ministry of Education), University of Electronics Science & Technology of China, Chengdu, Sichuan, 610054, China
国际会议
成都
英文
492-495
2006-09-18（万方平台首次上网日期，不代表论文的发表时间）