Self-potential sensor for rock masses
A self-potential and sensor technology, applied in the direction of AC/DC potential difference measurement device, etc., can solve the problem of not being suitable for monitoring the self-potential signal in the process of coal and rock deformation and fracture, and achieve the effects of fast rise time, good stability and high sensitivity
Inactive Publication Date: 2014-12-10
LIAONING TECHNICAL UNIVERSITY
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Problems solved by technology
Obviously, these two potential sensors are not suitable for monitoring the self-potential signal of the coal deformation and fracture process.
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[0024] An embodiment of the present invention provides a structural block diagram of the rock mass self-potential sensor, as figure 1 As shown, it includes: a first electrode 2, a second electrode 3 and a sense amplifier 4; the sense amplifier 4 includes a charge sensitive stage 5 and an amplified output stage 6; the charge sensitive stage 5 is mainly composed of a first operational amplifier 9 Composition; The amplified output stage 6 is mainly composed of a filter 10 and a second operational amplifier 11;
[0025] The charge sensitive stage 5, that is, the two input ends of the first operational amplifier 9 are used as the two input ends of the sense amplifier 4 to be respectively connected to an end face of the first electrode 2 and an end face of the second electrode 3 for receiving the first The self-potential signal transmitted from the first electrode 2 and the second electrode 3 is amplified into a first voltage signal, and is output to the input of the filter 10 as th...
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The invention discloses a self-potential sensor for rock masses, and belongs to the field of testing instruments for rock masses. The self-potential sensor comprises a first electrode, a second electrode and a sensor amplifier. The sensor amplifier comprises a charge sensitivity stage and an amplification output stage; the charge sensitivity stage mainly comprises a first operational amplifier; the amplification output stage mainly comprises a filter and a second operational amplifier; two input ends of the charge sensitivity stage are respectively connected with one end of the first electrode and one end of the second electrode, and an output end of the charge sensitivity stage is connected with an input end of the amplification output stage; an output end of the amplification output stage is connected with an input end of the second operational amplifier; the other end of the first electrode and the other end of the second electrode are respectively arranged at two corresponding positions of the surface of a rock mass test piece. The self-potential sensor for the rock masses has the advantages that extremely small self-potential signals which are generated in coal and rock mass deformation and rupture procedures can be converted into signals which are easy to measure, transmit and process, the self-potential sensor is simple in circuit, small in size, low in manufacturing cost and noise, high in sensitivity and good in stability, output signals are short in rise time, and the like.
Description
technical field [0001] The invention belongs to the field of rock mass testing instruments, in particular to a rock mass self-potential sensor. Background technique [0002] Rock burst is a serious natural disaster in mines. With the increase of mining intensity and depth, the mining conditions are becoming more and more complex. Shock phenomena have also appeared in mines that were not at risk of impact. Rock burst and other mine dynamic disasters have become a safety hazard in mining areas. major threat to production. Therefore, it is particularly important to make accurate and timely predictions and forecasts for the occurrence of rock bursts, and then take measures to prevent and control disasters. It has become an important task for scientific and technological workers and mine engineering technicians. Key scientific questions that urgently need to be addressed. [0003] The research on self-potential and electric charge changes in the process of rock deformation and ...
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IPC IPC(8): G01R17/20
Inventor 赵扬锋刘玉春罗浩潘一山李国臻
Owner LIAONING TECHNICAL UNIVERSITY