A novel method for improving the space resolution of distributed optical fiber temperature sensing system using decoupling technique

摘要

The distributed optical fiber temperature sensing system based on th Raman back scattering has been widely used. By using the optical time domain reflection (OTDR) technique, the igh intensity light pulse is coupled into optical fiber. By detecting and recording the variation of back scattering signal realted to optical fiber temperature along with the time, the distribution measurement of environmental temperature is carried to optical fiber temperature along with the time, the distribution measurementt of environmental temperature is carried out. In order to ensure a ceraiin intensity of the light pulse, it must have a certain width. In the meanwhile, the responding rate of the photoelectric components and the bandwitdth of the digital collection systems cause the reduction of the space resolution. The signal coupling brought by the pulse width can be reduced and the space resolution of distributed optical fiber temperature sensing system can be improved by using self-adaptive wavelet nerve network which has a stronger ability of function approach and tolerant fault to process the data.