A configurable pipeline optical fiber disturbance alarm detection method and its detector
A detection method, flow-through technology, applied in the field of detectors, can solve problems such as poor anti-noise performance, difficulty in meeting requirements with fixed filters, lack of flexibility, etc., to achieve high work efficiency, fast and flexible configuration, and high wide adaptability Effect
Active Publication Date: 2016-03-02
TIANJIN UNIV
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However, the zero-crossing detection is carried out in the time domain, and the anti-noise performance is relatively poor, and it is often difficult to meet the requirements in a strong noise environment; and the frequency ranges of external noise and intrusion events at different times, different locations, and different systems are different. Changes, so it is difficult to meet the requirements using a fixed filter alone, lacking flexibility
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[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below.
[0031] Based on this, the present invention uses Mach_Zehnder distributed optical fiber sensing system [15][16] As background, a rapidly configurable optical fiber violation event alarm detector is proposed. The detector can quickly configure a high-pass filter that can distinguish between non-disturbing and disturbing features according to the frequency characteristics of the non-disturbing signal and the disturbing signal [17] , the process can be realized by pipeline filter processing, and the rapid detection of the intrusion alarm of the disturbance signal is completed.
[0032] 101: Perform fast Fourier transform on the signal collected by the vibration sensor to obtain the cutoff frequency f c ;
[0033] like figure 1 shown, enter x 0 (n) is the signal collected by th...
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The invention discloses a method for a configurable water flow type optical fiber interference alarm and a detector of the method and relates to the field of detectors. The method comprises the steps that downsampling is conducted on a signal acquired by a vibration sensor through the signal downsampling rate D to obtain a new signal, a filter coefficient vector is rapidly configured according to filter parameters N and p, x(n) of water flow input is filtered through a filter, and the processed x'(n) is output; the power P of the x'(n) is worked out and compared with a preset power threshold value Pth, if P is larger than Pth, the alarm is given by an optical fiber system, and it shows that external event invasion exists. The detector is operated according to the modes that after downsampling is conducted on the signal, the signal enters a DSP device in a parallel data input mode, the high-pass filter parameter p and the power threshold value Pth are output at the same time, an event invasion detection result is obtained through DSP device processing, and if invasion exists, the alarm is given by an alarm device. According to the method and the detector, rapid and flexible configuration is conducted on the high-pass filter coefficient and the high timeliness and wide adaptation are achieved.
Description
technical field [0001] The invention relates to the field of detectors, in particular to a configurable flow-type optical fiber disturbance alarm detection method and a detector thereof. Background technique [0002] With the development of optical fiber and optical fiber communication technology [1] maturation of the fiber optic sensor [2] developed rapidly. The optical fiber sensor uses its own sensitive characteristics for sensing, and modulates the transmitted light in the optical fiber through the measured physical quantity (such as stress, temperature, pressure, electric field, magnetic field, etc.), so that the intensity, phase, frequency or polarization state of the light wave, etc. The characteristics change, and the measured physical quantity is obtained by detecting the modulated optical signal at the receiving end [3] . [0003] Perimeter Security System Based on Optical Fiber Sensing Technology [4] In the field of security, people have gradually paid attent...
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IPC IPC(8): G08B13/186
Inventor 黄翔东余佳刘铁根刘琨陈沁楠吕辰刚
Owner TIANJIN UNIV