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Proceedings Paper

Research on temperature sensor using light speed slowdown method in an inner interfering optical fiber
Author(s): Dan Jin; Gang Zheng; Yanmin Li; Mengchao Li
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Paper Abstract

In the paper, we propose one new type sensor with using light modulation method. Having learned to delay a light signal by means of optical fibers, the temperature filed may be detected by this way. According to the light speed can be modulated in a photorefractive material in which written steady volume-index grating by two laser beams in opposite direction, so as to the light signal may transmit with phase modulating due to intervening of another frequency shifting laser beam. In the experiment, the inner grating would be written in an optical fiber in which the suitable Stannum has been doped. The periodic structure in the fiber can make the light signal reflect and the value of the phase shift is corresponding to the effective length of the periodic grating. According to magneto-optical Faraday effect, the temperature may changes polarization direction by shifting the Verdet constant. During the testing period, a Sn-doped fiber is exposed to measured temperature environment and certain uniform steady field. Under this environment, the more increasing of temperature, the shorter effective interference area is in the fiber. Comparing with the light delayed signal that transmits through fiber with different temperature, the delaying value may be corresponded to the temperature. This research work was supported by the National Natural Science Foundation of China under grant No.60472023.

Paper Details

Date Published: 1 November 2007
PDF: 8 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64231P (1 November 2007); doi: 10.1117/12.779652
Show Author Affiliations
Dan Jin, Univ. of Shanghai for Science and Technology (China)
Gang Zheng, Univ. of Shanghai for Science and Technology (China)
Yanmin Li, Univ. of Shanghai for Science and Technology (China)
Mengchao Li, Univ. of Shanghai for Science and Technology (China)


Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering

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