Frontiers of Optoelectronics, Volume. 5, Issue 3, 345(2012)
An optimized distributed fiber Bragg grating sensing system based on optical frequency domain reflectometry
In this paper, the waveforms in time domain and frequency domain of two kinds of optical frequency domain reflectometry (OFDR) sensing systems are compared, which use common fiber Bragg grating (FBG) and chirped grating, respectively. The results show that chirped fiber grating with about 3 nm of full width at half maximum (FWHM) is helpful to reduce frequency noise evidently and makes the characteristic frequency distinct. OFDR distributed sensing system with chirped grating also offers longer available time, which makes it convenient to measure slow time-varying signal. Such OFDR distributed sensing system is supposed to be more suitable to be applied in bridge health monitoring, and it will improve the accuracy and reliability of the measurement.
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Yuewen HAN, Cheng CHENG. An optimized distributed fiber Bragg grating sensing system based on optical frequency domain reflectometry[J]. Frontiers of Optoelectronics, 2012, 5(3): 345
Received: Nov. 11, 2011
Accepted: Mar. 28, 2012
Published Online: Oct. 12, 2012
The Author Email: HAN Yuewen (xiziku@163.com)