Fig. 5: Various denoising schemes in improving temperature measurement accuracy performance.
From: Physics and applications of Raman distributed optical fiber sensing
Among them, the pulse coding scheme can increase the luminous flux incident on the sensing fiber under the premise of suppressing the nonlinear effect of the fiber, thereby improving the SNR. Algorithm denoising, noise suppression scheme in the calibration stage, and the Rayleigh optical noise suppression scheme improve the SNR by suppressing the electrical noise and optical noise, respectively.
