Title :
Fiber laser sensor with beat frequency demodulation
Author :
Liang Gao ; Shengchun Liu ; Zuowei Yin ; Haiting Zhang ; Lin Chen ; Liang Zhang ; Xiangfei Chen
Author_Institution :
Nanjing Nat. Lab. of Microstructures, Nanjing Univ., Nanjing, China
Abstract :
An improved multi-longitudinal mode fiber laser sensor formed by a fiber Bragg grating, a piece of Erbium-doped fiber and a fiber reflector is proposed and demonstrated experimentally. By using a fiber reflector, the presented sensor system has higher SNR and lower threshold than the original fiber sensor system with two FBGs. Experimental results show that strain sensitivities are -0.697 KHz/με @ 915 MHz and -1.31 KHz/με @ 1713MHz, respectively. The root mean square deviations are about 3.2 με@915 MHz and 2.5 με@1713 MHz.
Keywords :
fibre optic sensors; optical elements; erbium doped fiber; fiber Bragg grating; fiber laser sensor; fiber reflector; frequency demodulation; strain sensitivity; Fiber laser sensor; beat frequency; multi-longitudinal mode;
Conference_Titel :
Optical Communications and Networks (ICOCN 2010), 9th International Conference on
Conference_Location :
Nanjing
DOI :
10.1049/cp.2010.1145
