We propose a scheme of phi-OTDR, which includes irregularly arranged weak fiber Bragg gratings (wFBG) in sensing fiber for laser wavelength instability measurement and compensation. In a scheme with 4 pairs of wFBG, wavelength shift is measured with 16 times higher resolution, which allows reducing the effect of laser instability on phi-OTDR accuracy.
Compensation of Wavelength Instability in $\Phi$-OTDR with Weak Fiber Bragg Gratings
Svelto, C.;
2022-01-01
Abstract
We propose a scheme of phi-OTDR, which includes irregularly arranged weak fiber Bragg gratings (wFBG) in sensing fiber for laser wavelength instability measurement and compensation. In a scheme with 4 pairs of wFBG, wavelength shift is measured with 16 times higher resolution, which allows reducing the effect of laser instability on phi-OTDR accuracy.File in questo prodotto:
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