Research of FBG strain sensors based on light speed modulating method

Yanmin Li; Mengchao Li; Gang Zheng; Songlin Zhuang

doi:10.1117/12.779617

1 November 2007 Research of FBG strain sensors based on light speed modulating method

Yanmin Li, Mengchao Li, Gang Zheng, Songlin Zhuang

Proceedings Volume 6423, International Conference on Smart Materials and Nanotechnology in Engineering; 64233W (2007) https://doi.org/10.1117/12.779617
Event: International Conference on Smart Materials and Nanotechnology in Engineering, 2007, Harbin, China

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.

Citation Download Citation

Yanmin Li, Mengchao Li, Gang Zheng, and Songlin Zhuang "Research of FBG strain sensors based on light speed modulating method", Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64233W (1 November 2007); https://doi.org/10.1117/12.779617

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