Fiber Bragg grating soil-pressure sensor based on dual L-shaped levers

Feng Li; Yanliang Du; Wentao Zhang; Fang Li

doi:10.1117/1.OE.52.1.014403

4 January 2013 Fiber Bragg grating soil-pressure sensor based on dual L-shaped levers

Feng Li, Yanliang Du, Wentao Zhang, Fang Li

Author Affiliations +

Optical Engineering, Vol. 52, Issue 1, 014403 (January 2013). https://doi.org/10.1117/1.OE.52.1.014403

Abstract

A fiber Bragg grating (FBG) soil-pressure sensor based on dual L-shaped levers is proposed and demonstrated. Using dual L-shaped levers, the deformation of the diaphragm, which experiences the soil pressure, will be transferred to the longitudinal strain of the FBG. The theoretical analysis on the sensitivity of the proposed sensor is given. The sensor has been calibrated in the laboratory. Experimental results show a good agreement with theoretical expectations. Furthermore, this soil-pressure sensor has been installed in an earth dam in Beijing, China. Drifting of the FBG wavelength has been collected in rainy days from May to July 2012. It has been found that the earth dam has an obvious change of internal stress in the rainstorm.

Citation Download Citation

Feng Li, Yanliang Du, Wentao Zhang, and Fang Li "Fiber Bragg grating soil-pressure sensor based on dual L-shaped levers," Optical Engineering 52(1), 014403 (4 January 2013). https://doi.org/10.1117/1.OE.52.1.014403

Published: 4 January 2013

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