Vector optical fiber sensing probe based on optical fiber interferometer and underground vector accelerometer

Abstract

The invention provides a vector optical fiber sensing probe based on an optical fiber interferometer and an underground vector accelerometer. A vector optical fiber sensing probe, a signal acquisitionsystem, a signal processing system and peripheral equipment are mainly included, wherein the vector optical fiber sensing probe includes three single-axis accelerometers, an outer cylinder, a sealingcover, a waterproof sealing optical cable joint and the like; two runway type optical fiber sensitive rings are pasted on two surfaces of an equal-strength cantilever beam to form a push-pull structure, sensitivity of the accelerometer can be improved, a damping liquid is filled in the probe to increase damping, and the influence of resonance on the accelerometer can be eliminated; and the threeaccelerometers are arranged in a 120-degree crossed and stacked mode to form the vector optical fiber sensing probe, a radial size of the probe can be effectively controlled, multiple measurement scenes with limitation on an equipment size can be met, and the accelerometers are particularly suitable for deep well earthquake observation.

Description

technical field [0001] The invention relates to an optical fiber interferometric measuring device, in particular to an optical fiber sensing probe and a vector accelerometer. Background technique [0002] The earth is a very active sphere, the continental plates are moving every moment, and earthquakes occur almost every day, among which there are more than 100 destructive earthquakes every year, causing countless disasters to the world. Since the 20th century, my country's destructive earthquakes account for more than 30% of the world's total, and 70% of them are shallow earthquakes, which are very destructive. More than 80% of my country's provinces have been affected by earthquake disasters. The total number of people killed by the earthquake has reached 660,000, the number of injured has reached as high as one million, and hundreds of millions of people have been affected. The earthquake has caused huge losses to my country's economy and people's livelihood. Therefore, ...

AI Technical Summary

Problems solved by technology

All of the above technologies use fiber gratings as sensing elements, which are limited by the working characteristics of fiber gratings. Compared with the interferometric measurement principle, the strain resolution is much smaller, resulting in the sensitivity of cantilever beam accelerometers based on fiber gratings. lower

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