Surface collapse optical fiber monitoring and early warning system and method

Abstract

The invention relates to a surface collapse optical fiber monitoring and early warning system and a surface collapse optical fiber monitoring and early warning method. The method comprises the following steps of: generating an optical signal, so that the optical signal enters a tested optical fiber; receiving an echo signal in the tested optical fiber, and converting the echo signal into an electric signal; performing signal conditioning processing on the electric signal; converting the conditioned electric signal into a digital signal; caching the digital signal; calculating the transmission distance of an optical signal which corresponds to the cached digital signal in the tested optical fiber, and calculating a corresponding fiber loss value according to the transmission distance; and comparing the calculated fiber loss value with a preset threshold value, and performing surface collapse early warning according to the comparison result. According to the method, the surface collapse monitoring can be easily, conveniently, rapidly and accurately realized, and surface collapse early warning is timely performed.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to an optical fiber monitoring and early warning system and method for ground subsidence. Background technique [0002] Ground subsidence refers to a geological phenomenon in which surface rocks and soils, etc., sink downward under the action of natural or human factors, and form subsidence pits or subsidence holes on the ground. When this geological phenomenon occurs in areas with human activities, it may become a geological disaster. [0003] Due to the characteristics of suddenness, concealment, uncertainty, and space-time effects of ground subsidence, the current treatment of ground subsidence is mainly based on prevention and protection measures. In view of the increasing trend of ground subsidence, in order to effectively ensure the safe operation of the project and reduce the catastrophic consequences of ground subsidence, it is very necessary to realize real-time monitorin...

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Problems solved by technology

[0009] In the process of realizing the present invention, the inventor found that: the above-mentioned repetitive leveling technique needs to compare more reference points, the time period of repeated leveling is relatively long, the amount of calculation is high, and the implementation is difficult

For the above-mentioned synthetic aperture radar interferometry technology, an important prerequisite for interference processing is the existence of coherence, that is, the similarity or correlation of the two scene image signals. It is difficult to obtain the real interferometric phase under the condition of decoherence; in addition, due to the influence of atmospheric fluctuations at the two observation times, especially the change of tropospheric humidity and temperature, there will be different phase delay phenomena, and the delay amount will be displayed on the phase diagram. Uniformity, for large-scale micro-deformation monitoring, this non-uniform phase delay will be introduced into the deformation phase as an error, which will affect its measurement accuracy

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