Multi-domain perimeter intrusion detection system by one machine is based on leaky cable. To solving the problem that the multi-frequency electromagnetic disturbance signal detection circuit is complex and repeated, a method is raised, which is without processing by different frequency, sending the intrusion disturbance signal from multisport to processing circuit to perform FFT, contrasting it with signal spectra without disturbance by frequency analysis, and determining if intrusion happened, the number of intrusion case, detailed place and domain. Simulation study is performing by Matlab, which demonstrated the feasibility and advantage in the project.
Acoustic thermometry method is used to measure two-dimensional temperature distribution of a circular boundary temperature field experimentally. The measured temperature field is compared with a point-by-point temperature measurement, the results shows that the acoustic method is consistent with the point-by-point measurement which proves that it is reliable to use this method to measure the two-dimensional temperature distribution.
Automatic defect detection of light image is very important in optical fiber panel (OFP) research now. In order to achieve detection of shadow defect automatically, proposed a new region growing algorithm. Using gray characteristics and fuzzy connectedness of image, realized automatic seeds selection by first selecting seed window then selecting seed points. Realized region growing algorithm with adaptive threshold by using maximum between-class variance method (OTSU). Proposed one OFP shadow detection evaluation operator, evaluation results showed that algorithm proposed in this paper was more accurate positioning of the shadow, achieved significant reduction in redundant information, and improved segmentation quality of the image effectively.
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