Optical fiber strain gauge and high-sensitivity disc-type displacement sensor with ultra-short base line

Abstract

The invention provides an optical fiber strain gauge and a high-sensitivity disc-type displacement sensor with an ultra-short base line. The optical fiber strain gauge comprises the displacement sensor, the measurement base line, base line fixing devices, suspension systems, a measurement control and signal recording and processing system and a measurement and calibration device, wherein the displacement sensor is fixed on a first bed rock and is connected with the head end of the measurement base line, the measurement and calibration device is mounted at the tail end of the measurement base line and is fixed on a second bed rock through the base line fixing devices, the suspension systems are mounted in the middle of the measurement base line, and the displacement sensor and the measurement and calibration device are connected with the measurement control and signal recording and processing system through signal connecting lines. The optical fiber strain gauge can be widely used for the geophysical research field of observation of crustal strain and solid tide, seismic precursor information acquisition and the like.

Description

technical field [0001] The invention relates to an optical fiber sensing and measuring device. Specifically, it is a displacement sensor and strain gauge used for geophysical research, observing crustal strain and solid tides, and obtaining earthquake precursor information. Background technique [0002] The strain gauge is an instrument that precisely measures the relative change of the distance between two points in the crustal rock mass. It has important applications in the fields of observing crustal strain and solid tides, as well as studying the process of earthquake breeding and obtaining earthquake precursors. [0003] Since the American seismologist H. Benioff developed the first valuable quartz extensometer in 1935, the United States, Britain, the former Soviet Union, Japan, Belgium, Germany and other countries have successively developed high-sensitivity extensometers. instrument. The sensitivity of the instrument is generally 10 -8 Above, solid tides can be cle...

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Problems solved by technology

[0008] Displacement sensors currently invented in strain gauges mainly use eddy current displacement sensors, differential transformer displacement sensors, or capacitive displacement sensors, among which the best displacement resolution of the first two is about 1 nanometer; The force can reach 0.01 nanometers, but there are shortcomings such as parasitic capacitance and distributed capacitance that have a great impact on sensitivity and measurement accuracy, nonlinear output, complex connection circuits, and serious moisture and electromagnetic interference, which are not suitable for long-term stability of the sensor by strain gauges. The need for reliable work

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