FBG sensing temperature characteristic and application in oil/gas down-hole measurement

doi:10.1007/s12200-009-0042-8

Front Optoelec Chin

2009, Vol. 2

Issue (2) : 233-238 https://doi.org/10.1007/s12200-009-0042-8

RESEARCH ARTICLE

FBG sensing temperature characteristic and application in oil/gas down-hole measurement

Shaomin LI, Xiaoying LIU(

), Chong LIU

College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

Fiber Bragg gratings (FBGs) have been used to sense numerous parameters such as strain, temperature, and pressure. Cost-effective multipoint measurements have been achieved by connecting FBGs in parallel, serial, and other topologies as well as by using spatial, wavelength, and time-domain multiplexing techniques. This paper presents a method of measuring temperature of the oil/gas down-hole. Detailed contents include the basic theory and characteristics of fiber gratings, analysis of the sensing mechanism of fiber-optic gratings, and the cross-sensitivity effect between temperature and strain; the method of making the light-source of the fiber-optic gratings and the technology of measuring wavelength shift, building an experimental system of the temperature measurement, and dealing with the experimental data. The paper makes a comparison of several kinds of FBG sensing systems used in oil/gas down-hole to measure temperature and the analysis of the experimental results of building the temperature measurement system. It demonstrates that the fiber-optic grating sensing method is the best choice in all methods of measuring temperature in oil/gas down-hole, which has a brilliant applied prospect.

Keywords fiber-optic gratings oil/gas down-hole cross-sensitivity effect sensor temperature measurement

Corresponding Author(s): LIU Xiaoying,Email:liuxy@mail.hust.edu.cn

Issue Date: 05 June 2009

Cite this article:

Shaomin LI,Xiaoying LIU,Chong LIU. FBG sensing temperature characteristic and application in oil/gas down-hole measurement[J]. Front Optoelec Chin, 2009, 2(2): 233-238.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-009-0042-8
https://academic.hep.com.cn/foe/EN/Y2009/V2/I2/233

Fig.1 Sensing schematic diagram of FBG in free conditions

Fig.2 curve of LED

Fig.3 Driving circuit of light source for LED

Fig.4 Principle chart of tunable F-P cavity measuring reflected wavelength of FBG

Fig.5 Schematic diagram of tunable F-P cavity

Fig.6 Fundamental principle block diagram of FBG sensor

Fig.7 Fundamental principle block diagram of FBG sensor

Fig.8 Curves of wavelength shift and temperature variation

Fig.9 Comparison with fitting linear curve and experimental curve

Fig.10 Reflectance spectrogram of single FBG sensor

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