Title :
Simultaneous Long- and Short-Gauge Strain Measurement in Spectral Domain by a Novel Optical Fiber Sensor Unit
Author :
Zhang, Jianzhong ; Peng, G.D. ; Yuan, Libo ; Sun, Weimin ; Jin, Wencai
Author_Institution :
Harbin Eng. Univ., Harbin
fDate :
7/15/2007 12:00:00 AM
Abstract :
A novel fiber-optic sensor unit by combining fiber-optic white-light interferometry and fiber Bragg gratings is proposed for simultaneous long- and short-gauge strain measurements. A new demodulation scheme based on spectral coherence theory for fiber-optic white-light interferometric sensors is proposed. This makes it possible that two quite different types of sensors in one unit can be simultaneously demodulated in the spectral domain. An experimental sensor unit has been built and tested. The results demonstrated that the spectral demodulation of the sensor unit is readily realized and that the sensor scheme is feasible.
Keywords :
Bragg gratings; demodulation; fibre optic sensors; light coherence; light interferometry; optical fibre testing; spectral-domain analysis; strain measurement; fiber Bragg gratings; fiber-optic sensor unit; fiber-optic white-light interferometric sensors; long-gauge strain measurement; short-gauge strain measurement; spectral coherence theory; spectral demodulation scheme; spectral domain; Bragg gratings; Demodulation; Fiber gratings; Mechanical sensors; Optical fiber sensors; Optical fiber testing; Optical fiber theory; Optical interferometry; Sensor phenomena and characterization; Strain measurement; Fiber Bragg grating (FBG); fiber-optic sensor; fiber-optic white-light interferometry (FOWLI); spectral coherence;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.899859