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Proceedings Paper

Research of FBG strain sensors based on light speed modulating method
Author(s): Yanmin Li; Mengchao Li; Gang Zheng; Songlin Zhuang
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Paper Abstract

The principle of the most of the FGB strain sensor is to detect the shift of the central wavelength in FBGs. Now, we propose a new strain sensor using light speed extraordinary controlled method in a periodic structure modulated optical fiber. According to the light speed can be modulated in a photorefractive material in which written volume-index grating by two laser beams in opposite direction of fiber, 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 little Stannum has been doped. With the quantum theory, the energy-band structure has a zero slope at the edges of the Brillouin zone and the group velocity of the photons at the band structure of a periodic structure is zero. Due to the effect of stress, the optical principal axle rotation angle of each beam is shifted, inducing the inner effective grating changed. During the testing period, pressure is put to a point of the fiber and fiber would be partly in uniform magnetic field. Under this environment, according to the elasto-optical effect and magneto-optical effect, the pressing position and pressure value can be determined. The output signal light could be processed by various smart way. 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: 6 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64233W (1 November 2007); doi: 10.1117/12.779617
Show Author Affiliations
Yanmin Li, Univ. of Shanghai for Science and Technology (China)
Mengchao Li, Univ. of Shanghai for Science and Technology (China)
Gang Zheng, Univ. of Shanghai for Science and Technology (China)
Songlin Zhuang, 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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