DocumentCode :
3721780
Title :
A fiber Fabry-Perot interferometer for geophysics applications
Author :
H. C. Seat;M. Cattoen;F. Lizion;M. Suleiman;F. Boudin;J. Chéry;C. Brunet;P. Bernard;P. Chawah;A. Sourice;G. Plantier;D. Boyer;A. Cavaillou;S. Gaffet
Author_Institution :
CNRS, LAAS, F-31400 Toulouse, France
fYear :
2015
Firstpage :
1
Lastpage :
4
Abstract :
A fiber interferometer interfaced to 3 geo-mechanical elements is presented for applications in geophysics. The fiber sensor is based on an extrinsic fiber Fabry-Perot interferometer (EFFPI) which incorporates a modulation scheme to lock the interferometer at quadrature and to enable displacement measurements below a quarter of the interrogating wavelength. It operates over a relatively large frequency dynamic of ~500000 with a precision better than 2 nm. The fiber interferometer is next interfaced to a differential hydrostatic long baseline inclinometer, a 3-axis borehole tiltmeter and a single-axis seismometer, respectively. Results obtained demonstrate that the fiber interferometrically-interrogated instruments exhibit performances equivalent to or even surpassing those of the reference instruments employed for comparison during their deployment to an underground test site since March 2012.
Keywords :
"Optical fiber sensors","Instruments","Optical fibers","Optical fiber networks","Optical fiber testing","Earthquakes"
Publisher :
ieee
Conference_Titel :
SENSORS, 2015 IEEE
Type :
conf
DOI :
10.1109/ICSENS.2015.7370316
Filename :
7370316
Link To Document :
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