In order to detect external intrusion which threatens the safety of oil-gas gathering pipelines in time, it is necessary to monitor the operation status of pipelines in real time. A distributed fiber optic perturbation sensing principle based on the Mach-Zehnder (M-Z) interferometer was described. The experimental device was set up to monitor the intrusion signal along the optical fiber. An improved cross correlation algorithm was used to locate intrusion, which processed piecewise signal. Experiments were completed on the disturbance's optic fiber with a total length of 10.1km. The system monitored the external intrusion signal and correctly displayed the position in real time. The average positioning error 68.12m is achieved. The positioning error is reduced about 43% over the conventional method. The proposed method can effectively improve the positioning accuracy of the external intrusion signal.
The study on the scattering characters of the targets scattered by the polarized light, is a very important approach to study
the characters of the targets. Based on the scattered model of the non-spherical particles, the Mueller matrix can be
calculated using the vector radiative equation. The change of the polarization degree vs. parameters of the scattered
medium will be discussed in this article.
A binary optics method has been adopted to improve upon a conventional optical system in guidance and control, and a
hybrid broadband imaging system that includes a binary surface is analyzed and evaluated by optical design software
ZEMAX. The practical design shows that the introduction of binary optics can simplify the structure of the imaging
system and reduce the size and weight of the broadband guidance and control system. Moreover, it can help to acquire
images of radiation of different wavelengths from targets; hence it will result in improved overall performance of
missiles in wars.
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