Yang Li, Yang Zhi, Liu Wei, et al. Research on the correlation characteristics of COTDR scattering signals[J]. 2012,(4):7-9. DOI: 10.13756/j.gtxyj.2012.04.020.
we analyze the correlation characteristics of Rayleigh backscattering signals of incident light with different frequencies in the frequency domain on the basis of the distributed fiber temperature and the strain sensing principle of the Coherent Optical Time-Domain Reflectometer(COTDR).Then
we explain the transmission principle of the Rayleigh backscattering signals in sensing fibers with a discrete Rayleigh backscattering model
simulate and analyze the COTDR process and analyze the power and correlation characteristics of incident signals with different pulse widths by using MATLAB software.The results show that the input pulse width is inversely proportional to the correlation width in frequency domain
i.e.the precision of the sensing position is inversely proportional to temperature or strain precision.