NDLI: Large area average temperature sensing by the use of optical coherence domain reflectometry

Content Provider	IEEE Xplore Digital Library
Author	Zhang, M. Gong, J.M. Chan, C.C. Wang, D.N. Jin, W. Demokan, M.S.
Copyright Year	2001
Description	Author affiliation: Dept. of Electr. Eng., Hong Kong Polytech. Univ., Kowloon, China (Zhang, M.)
Abstract	Average temperature measurements are important for the oil tanks, oil-filled power transformers and buildings. A lot of temperature sensors based on a number of different measurement principles have been developed. In this paper, we report a novel temperature sensing system by the use of optical coherence domain reflectometry (OCDR). OCDR is a technique based on the low coherence interferometry. A CW low coherence source with a coherence length on the order of 10 /spl mu/m is coupled to a fiber directional coupler and divided into the test arm and the reference arm. In the test arm, the light is divided into the sensing loop and sub-reference loop by the couplet and reflected by the loop ends (R1 and R2) with 4% reflectivity. The optical length of the test arm can be modulated by the PZT. The optical delay in the reference arm can be varied by translating the movable mirror. When it matches the delay for light reflected from R1 and R2 respectively, optical interference appears. The length difference between the sensing loop and the sub-reference loop is set to be less than 2 mm, but it is much longer than the coherence length of the light source. The signal detected by the photodetector is passed through a signal processing unit and the result is demonstrated in Fig.2 where the signal is a function of the mirror position. The peak R1 and R2 illustrate that the light reflected from the mirror matches that reflected from the loop ends R1 and R2 respectively. The distance between the two peaks illustrates the optical path difference between the sensing loop and the sub-reference loop. When the sensing loop is heated and the sub-reference loop kept under the same condition with the reference arm, the peak distance between R1 and R2 will be varied as a function of the temperature of the sensing fiber loop.
Starting Page	877
Ending Page	878
File Size	108187
Page Count	2
File Format	PDF
ISBN	0780371054
ISSN	10928081
DOI	10.1109/LEOS.2001.969096
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-11-12
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature sensors Optical sensors Optical interferometry Optical signal processing Optical modulation Mirrors Optical fiber testing Delay Signal processing Temperature measurement
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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