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http://dx.doi.org/10.5916/jkosme.2008.32.8.1257

Remote Measurement of a Distant Temperature and Current using Fiber Bragg Grating Sensors and Erbium-doped Fiber Ring Laser  

Sohn, Kyung-Rak (한국해양대학교 컴퓨터제어전자통신공학부)
Shim, June-Hwan (한국해양대학교 컴퓨터제어전자통신공학부)
Yang, Gyu-Sik (한국해양대학교 컴퓨터제어전자통신공학부)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.32, no.8, 2008 , pp. 1257-1262 More about this Journal
Abstract
A long-distance remote sensing of temperature and current based on a fiber Bragg grating (FBG) is proposed and demonstrated. The thermal expanding effect of the epoxy and the Er-doped fiber ring laser (EFRL) are applied to the sensor system to enhance the temperature and current sensitivity. An EFRL with a 5 km-single-mode fiber and a FBG shows a high extinction ratio of more than 60 dB and a low power fluctuation of less than 1 dB. The metal wires are used to supply the current to the sensors. When the NOA65 puts on the FBG as a thermal expanding material, the temperature and current sensitivity of the lasing wavelength shift are about $30\;pm/^{\circ}C$ and 3pm/mA, respectively. The proposed sensing scheme is useful for measurement of current or temperature at a distant object of more than several km.
Keywords
Fiber optic sensor; Fiber bragg grating; Erbium-doped fiber ring laser; Coefficient of thermal expansion; Long-distance sensor; Temperature sensor; Current sensor;
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