Optical fiber vibration safety early warning system vibration source early warning method based on sequential detection
A safety early warning system, optical fiber vibration technology, applied in alarms, measuring devices, and anti-theft alarm mechanical start-ups that rely on broken/disturbed straightened ropes/metal wires, etc., can solve the difficulty of identifying the type of vibration source, new hair There are many types of vibration sources, etc., to achieve the effect of low false alarm rate, low false alarm rate and fast response
Active Publication Date: 2018-04-13
BEIJING AEROSPACE YILIAN TECH DEV
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[0004] For the vibration signals detected in the early warning system, once the type of vibration source is determined, the corresponding early warning processing can be carried out. However, in most cases, the type of vibration source has the characteristics of difficult identification and many types of new vibration sources. Therefore, for In this case, it is necessary to analyze the continuity of the vibration source to reduce the system's false alarm rate and false alarm rate.
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[0050] A vibration source early warning method for an optical fiber vibration safety early warning system based on sequential detection, comprising: acquiring optical fiber vibration signal data, preprocessing the acquired vibration signal data, and determining the spatial position of the vibration signal data in the optical fiber, such as figure 1 As shown, set up a two-dimensional array based on time and space arrangement, wherein: the abscissa of the two-dimensional array is the spatial position axis, and the ordinate of the two-dimensional array is the time axis, and the steps of the early warning method further include:
[0051] Step 1: Establish a two-dimensional sequential detection model based on the two-dimensional array;
[0052] Step 2: Determine the alarm level through the established two-dimensional sequential detection model, and execute the alarm output;
[0053] The two-dimensional sequential detection model is the formula:
[0054]
[0055] formula:
[00...
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The invention discloses an optical fiber vibration safety early warning system vibration source early warning method based on sequential detection. The method comprises steps: optical fiber vibrationsignal data are acquired, the spatial locations of the vibration signal data in the optical fiber are determined, and a two-dimensional array which is arranged based on time and space is built, wherein the horizontal coordinate of the two-dimensional array is the spatial location axis, and the longitudinal coordinate of the two-dimensional array is the time axis; a two-dimensional sequential detection model is built according to the two-dimensional array; and through the built two-dimensional sequential detection model, a warning level is determined, and warning output is executed. Compared with the prior art, the method of the invention is quick in response speed, low in false warning rate and low in leakage warning rate, the sequential method is adopted to carry out cumulative analysis on the warning degree, contribution to the warning degree by each vibration is ensured, and quick response to a continuous vibration source is realized.
Description
technical field [0001] The invention relates to a vibration source early warning method for an optical fiber vibration safety early warning system based on sequential detection. solution. Background technique [0002] With the rapid development of urban construction, more and more building facilities and areas need security protection, such as military facilities, power stations, hospitals, oil pipelines, etc. The optical fiber vibration safety early warning system uses passive distributed optical fiber as the sensor, which has the advantages of strong anti-interference ability and large detection distance. The optical fiber vibration safety early warning system detects the external vibration signal along the optical fiber, and through the relevant processing of the detection signal, automatically identifies the type of vibration source, so as to realize the timely alarm of harmful behavior, which has important practical value. [0003] At present, the signal detection tec...
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IPC IPC(8): G08B13/12G01H9/00
CPCG01H9/004G08B13/12
Inventor 李国相苟武侯周莹
Owner BEIJING AEROSPACE YILIAN TECH DEV