An ultra-high-resolution FBG static-strain sensor for geophysics applications

Qingwen Liu; Zuyuan He; Tomochika Tokunaga; Kazuo Hotate

doi:10.1117/12.866402

8 September 2010 An ultra-high-resolution FBG static-strain sensor for geophysics applications

Qingwen Liu, Zuyuan He, Tomochika Tokunaga, Kazuo Hotate

Proceedings Volume 7653, Fourth European Workshop on Optical Fibre Sensors; 76530W (2010) https://doi.org/10.1117/12.866402
Event: (EWOFS'10) Fourth European Workshop on Optical Fibre Sensors, 2010, Porto, Portugal

Abstract

We report an ultra-high-resolution static-strain measurement with a pair of fiber Bragg gratings (FBGs), one for strain sensing and the other for compensating the error due to temperature disturbance and source drift. The difference between the two FBGs' Bragg wavelengths is evaluated by utilizing a cross-correlation algorithm. The mechanism of noise suppression by the cross-correlation algorithm is quantitatively analyzed and the factor that determines the ability of noise suppression of this algorithm is revealed. The temperature dependence is further subtracted by using a vector operation. When no strain is applied, an ultra-high wavelength resolution corresponding to 2.6 nε was obtained, which gives the ultimate performance of the measurement system. With a variable strain applied with a piezo-stage, a resolution of 17.6 nε was demonstrated. This is the first demonstration, to the best of our knowledge, that a real-static strain down to 10 nε is measured, providing a powerful technique for the measurement in geophysics application.

Citation Download Citation

Qingwen Liu, Zuyuan He, Tomochika Tokunaga, and Kazuo Hotate "An ultra-high-resolution FBG static-strain sensor for geophysics applications", Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 76530W (8 September 2010); https://doi.org/10.1117/12.866402

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