Integrated subsidence monitoring device based on optical fiber f-p cavity pressure sensor

Abstract

The invention provides an integrated settlement monitoring apparatus based on an optical fiber F-P cavity pressure sensor. The apparatus includes a micro optical fiber F-P cavity pressure sensor, an optical fiber, a liquid passing tube, a liquid storage container and a fiber bragg grating demodulation instrument. The micro optical fiber F-P cavity pressure sensor is installed in a pipeline of the liquid passing tube and passes through the liquid storage container from the pipeline of the liquid passing tube through a liquid passing tube port and an optical fiber outlet hole through the optical fiber and is lead out to the fiber bragg grating demodulation instrument. Pressure transmission liquid is arranged in the liquid passing tube and the liquid storage container. The liquid level in the pressure transmission liquid is higher than that in the micro optical fiber F-P cavity pressure sensor. The apparatus is simple in structure, is convenient to install, has long distance of transmission and has high measurement reliability. The apparatus can be used in settlement monitoring on a tailing dam and various rock and soil bodies under harsh environmental conditions.

Description

technical field [0001] The invention relates to the technical field of rock soil and engineering structure safety monitoring, in particular to an integrated settlement monitoring device based on an optical fiber F-P cavity pressure sensor, which is suitable for the uneven settlement monitoring of the foundation section of an earth-rock dam, as well as roadbed and soil backfill areas relative settlement monitoring. Background technique [0002] In the field of geotechnical and engineering structure safety monitoring, there are two types of traditional soil or structure settlement monitoring equipment that can be transmitted remotely: a hydraulic settlement instrument based on a pressure sensor suitable for buried installation and a static level suitable for surface installation. However, these devices have a large range and low resolution, or high resolution but a small range, which greatly limits their application environment. Moreover, due to the large number of components,...

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Problems solved by technology

However, the structure of this type of device is very complicated to install and debug due to the large number of pipelines, and the signal transmission distance of the electric pressure sensor is limited, and there are the following disadvantages: 1) Each monitoring point must be equipped with a liquid pipe, a vent pipe, For signal transmission cables, the more monitoring points, the more pipelines are configured, the installation is cumbersome, and the protection is also difficult; 2) The measuring range of the electric pressure sensor is inversely proportional to the measurement resolution, and the application range is limited; 3) Due to the use of electrical signal transmission, Susceptible to lightning strikes or electromagnetic interference; 4) and the transmission distance is limited, usually below a kilometer

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