A new FBG based dynamic-strain interrogation system

作者：Song Jian Fei^*; Shao Li Yang; Zhang A Ping; He Sai Ling; Kang Juan; Li Min

来源：Journal of Optoelectronics - Laser, 2007, 18(8): 924-926.

• Chirped fiber Bragg grating (CFBG)
• Dynamic strain measurement
• Fiber Bragg grating (FBG) sensor
• Strain gauge

A new dynamic-strain interrogation system based on a fiber Bragg grating (FBG) triangular filter is proposed and experimentally demonstrated in this paper. Through a chirp in grating period and an apodization in index modulation, we fabricated a FBG triangular filter, and utilized this filter to demodulate the dynamic-strain signal of another wavelength-matched FBG sensor. By comparing with the results measured by a commercial strain-gauge, this system is proved to have a good performance in the measurement of dynamic strain. Since the system is compact and passive, it is able to be integrated as a portable demodulation module.

• 出版日期2007
• 单位浙江大学