Weak oscillation monitoring optical fiber sensor and sensor system formed by same and application method of sensor system

Abstract

The invention discloses a weak oscillation monitoring optical fiber sensor which comprises a light source input device and a light source output device corresponding to the light source input device, wherein the downsides and upsides of the light source input device and the light source output device are connected through fixed supports, and the fixed support above or below the light source input device and the light source output device is also connected with a vibration induction membrane; two adjacent longitudinal side surfaces of the light source input device and the light source output device are respectively provided with a lens; and a light separating plate is arranged between the lenses of the light source input device and the light source output device, and is provided with a light transmitting hole for enabling a light source to be transmitted into the light source output device from the light source input device. The invention also discloses a sensor system formed by the weak oscillation monitoring optical fiber sensor and an application method of the sensor system. The invention solves the problems of low measurement accuracy and sensitivity as well as narrow measurement range of the traditional oscillation optical fiber sensor in the prior art.

Description

technical field [0001] The invention relates to an optical fiber sensor, in particular to a weak oscillation monitoring optical fiber sensor, a sensor system and an application method of the system. Background technique [0002] During the process of earthquake from gestation to earthquake, there will be piezoelectric effect, electrokinetic effect, thermoelectric effect, etc., which can lead to the accumulation and release of electric charge when the rock is micro-fractured, so that the source area radiates electromagnetic waves with a wide spectrum. This is known as a radiation anomaly, an anomaly that propagates to the Earth's surface before earthquakes and creates specific observable precursors. Earthquake precursors mainly include: ground deformation, stress deformation, infrasonic waves, geomagnetic field, gravity field, hydrogeochemistry, underground fluid dynamics and other abnormal changes. Usually, these abnormal changes are very weak and cannot be monitored in real...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a weak oscillation monitoring optical fiber sensor and its sensor system and application method of the system, so as to solve the problem that the traditional intensity modulation optical fiber displacement sensor in the prior art cannot be used in the insensitive area, and cannot The problem of accurately distinguishing the strength of oscillation

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