Abstract

The second-order partial derivative of the Stokes signal with respect to frequency and position shows a maximum or minimum at the boundary between two different strained sections. This idea is used to locate the boundary of different stress regions. Knowing the boundaries, we then fit the Brillouin spectrum at the middle between them to get the strain value. This allows a location accuracy of between 5 and $10\mathrm{cm}$, which is shorter than the pulse length of $20\mathrm{cm}$ used in the experiment. The lowest detectable Brillouin frequency difference between two strain sections is $1.2\mathrm{MHz}$.

© 2005 Optical Society of America

Brillouin spectral deconvolution method for centimeter spatial resolution and high-accuracy strain measurement in Brillouin sensors

Shahraam Afshar V., Xiaoyi Bao, Lufan Zou, and Liang Chen
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Simple approach to determining the minimum measurable stress length and stress measurement accuracy in distributed Brillouin sensing

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Simultaneous temperature and strain measurement with combined spontaneous Raman and Brillouin scattering

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A 5 cm spatial resolution temperature compensated distributed strain sensor evaluated using a temperature controlled strain rig

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