Novel method for improving the space resolution of distributed optical fiber temperature sensing system using decoupling technique
Peiguo Hou, Longjiang Zheng, Litian Wang, Yutian Wang · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2000
The distributed optical fiber temperature sensing system based on the Raman back scattering has been widely used. By using the optical time domain reflection (OTDR) technique, the high intensity light pulse is coupled into optical fiber. By detecting and recording the variation of back scattering signal related to optical fiber temperature along with the time, the distribution measurement of environmental temperature is carried out. In order to ensure a certain intensity of the light pulse, it must have a certain width. In the meanwhile, the responding rate of the photoelectric components and the bandwidth 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.