Method and device for shielding weather interference in fiber monitoring alarm system

Abstract

The invention discloses a method and device for shielding weather interference in a fiber monitoring alarm system. The method comprises the following steps: step1, performing endpoint detection of disturbing signals by adopting a method of short-time energy and short-time zero-crossing rate to detect an initial point and an end point of an effective signal; step2, performing calculation of a Pearson product-moment correlation coefficient of effective signals lambda1 and lambda1, which are monitored by two sensors separated at a certain distance, and determining the disturbing signal, the Pearson product-moment correlation coefficient of which is higher than the upper coefficient threshold CH, as a weather disturbing signal; and determining the disturbing signal, the Pearson product-moment correlation coefficient of which is lower than the lower coefficient threshold CL, as an invasion signal, and sending put an alarm. The method and device for shielding weather interference in the fiber monitoring alarm system is high in monitoring efficiency and accuracy, and is easy to apply.

Description

technical field [0001] The invention relates to a method and device for shielding weather interference in an optical fiber monitoring and alarm system. Background technique [0002] Optical fibers are very sensitive to external environmental factors. Changes in environmental conditions such as temperature, pressure, electric field, and magnetic field will cause changes in light wave parameters (such as intensity, phase, frequency, polarization state, etc.). According to the changes of these parameters, the optical fiber sensor can know the size of physical quantities such as temperature, pressure, electric field, and magnetic field that cause the changes of these light wave parameters. In addition, the optical fiber sensor also has the characteristics of small size, light weight, anti-electromagnetic interference, high sensitivity, and easy networking, and the optical fiber itself is passive, does not require external power supply, and can also be used as a signal transmissi...

AI Technical Summary

Problems solved by technology

However, due to the different values ​​of short-term energy ratio and short-term zero-crossing rate calculated by different intensities of climate (such as heavy rain and light rain), it is necessary to adjust the upper and lower limits at any time according to weather changes, so the monitoring efficiency of this method and Accuracy needs to be improved

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