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A temperature demodulation method by using compensation of fiber attenuation and dispersion for distributed temperature sensors (DTS) is proposed and demonstrated in order to improve the DTS measuring speed and accuracy. Firstly, the attenuation coefficients difference between anti-Stokes and Stokes backscattering is modified, which avoids the calibration processing on the entire sensing optical fiber...
We present the first demonstration of distributed strain/temperature sensing in side hole fibers (SHFs) based on Brillouin optical time domain analysis systems (BOTDA). The Brillouin frequency shift (BFS) of 10.22 GHz and the Brillouin linewidth of 40 MHz were measured. The temperature and strain coefficients of the Brillouin frequency shift are 1.08 MHz/O and 0.089 MHz/με, respectively. Compared...
FBG inscribed on splice joint is proposed to be used as a sensor. It could realize temperature and strain measurement simultaneously because of the different strain responses of the different parts of the FBG inscribed on splice joint, while the temperature responses are same. The strain responses of four overlap values are discussed, which is used to optimize the discrimination capability of the...
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