Abstract
A parallel demodulation system for extrinsic Fabry–Perot interferometer (EFPI) and fiber Bragg grating (FBG) sensors is presented, which is based on a Michelson interferometer and combines the methods of low-coherence interference and a Fourier-transform spectrum. The parallel demodulation theory is modeled with Fourier-transform spectrum technology, and a signal separation method with an EFPI and FBG is proposed. The design of an optical path difference scanning and sampling method without a reference light is described. Experiments show that the parallel demodulation system has good spectrum demodulation and low-coherence interference demodulation performance. It can realize simultaneous strain and temperature measurements while keeping the whole system configuration less complex.
© 2006 Optical Society of America
Full Article | PDF ArticleMore Like This
Junfeng Jiang, Tiegen Liu, Yimo Zhang, Lina Liu, Ying Zha, Fan Zhang, Yunxin Wang, and Pin Long
Opt. Lett. 30(6) 604-606 (2005)
Yi Qiao, Yi Zhou, and Sridhar Krishnaswamy
Appl. Opt. 45(21) 5132-5142 (2006)
Markus Schmidt, Bernd Werther, Norbert Fürstenau, Michael Matthias, and Tobias Melz
Opt. Express 8(8) 475-480 (2001)