Title :
Simultaneous measurement of down-hole high pressure and temperature with a bulk-modulus and FBG sensor
Author :
Zhao, Yong ; Liao, Yanbiao ; Lai, Shurong
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
A free active element bulk-modulus-based fiber Bragg grating (FBG) sensor for down-hole pressure and temperature measurement is presented. With a differential measurement method and an isosceles triangle cantilever structure, problems of cross-sensitivity and chirped-signal in FBG sensors are solved. Simulation results indicate that the measurement sensitivity in measuring pressure and temperature is estimated to be /spl sim/8.5 pm/MPa in a range from standard atmosphere pressure to 100 MPa and /spl sim/27.5 pm//spl deg/C from 20 to 200/spl deg/C, respectively.
Keywords :
Bragg gratings; Young´s modulus; chirp modulation; fibre optic sensors; optical modulation; pressure measurement; pressure sensors; sensitivity; temperature measurement; temperature sensors; 100 MPa; 20 to 200 degC; FBG sensor; bulk-modulus; bulk-modulus-based fiber Bragg grating sensor; chirped-signal; cross-sensitivity; differential measurement method; down-hole high pressure measurement; down-hole high temperature measurement; isosceles triangle cantilever structure; measurement sensitivity; standard atmosphere pressure; Atmospheric measurements; Atmospheric modeling; Bragg gratings; Chirp; Fiber gratings; Measurement standards; Pressure measurement; Temperature distribution; Temperature measurement; Temperature sensors;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2002.803914
