A Programmable Gain Amplification System for Earth's Natural Pulsed Electromagnetic Field Signals
A technology of program-controlled gain amplification and pulsed electromagnetic field, which is applied in seismic signal processing and other directions, to achieve the effect of high input impedance and high common mode rejection ratio
Inactive Publication Date: 2017-12-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Since there is no accurate method in the field of earthquake precursor prediction research to predict the occurrence of earthquakes, it is necessary for new research on earthquake precursor prediction in order to find a better method to predict the occurrence of earthquakes
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[0025] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, and the content of the present invention is not limited to the following embodiments.
[0026] The program-controlled gain amplification system for the earth's natural pulsed electromagnetic field signal provided by the invention, such as figure 1 As shown, it includes a computer, a single-chip microcomputer MSP430G2553 connected to the computer through a serial port line, a sensor and a signal amplification unit for collecting the earth's natural pulsed electromagnetic field signal, and the sensor and the single-chip computer are collected by an AD composed of an instrument amplifier INA128 and a digital-to-analog conversion circuit. The circuit is connected, and the signal amplification unit is a program-controlled gain amplifier circuit, and the collected earth’s natural pulsed electromagnetic field signal is output after being adjusted by the program...
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The invention provides a program-controlled gain amplification system for the earth's natural pulsed electromagnetic field signal, including a computer, a controller, a sensor and a signal amplification unit, and the AD between the sensor and the controller is formed by a signal conditioning circuit and a digital-to-analog conversion circuit. The acquisition circuit is connected, and the signal amplification unit is a program-controlled gain amplifier circuit composed of a three-stage amplifier circuit and a program-controlled attenuation circuit. The collected earth's natural pulse electromagnetic field signal is output after being adjusted by a program-controlled gain amplifier circuit. Both the AD acquisition circuit and the program-controlled gain amplifier circuit are compatible with The controller is electrically connected, and a power module is connected to the controller; in the program-controlled gain amplification system provided by the present invention, the instrument amplifier is used as the front stage to obtain weak signals, and the latter two stages use precision low-noise operational amplifiers to form a high-gain amplification circuit to achieve the highest The amplification factor is 80dB, and a program-controlled attenuation circuit is inserted in the middle stage to realize the program-controlled adjustable amplification factor of 0-80dB.
Description
technical field [0001] The invention relates to a program-controlled gain amplification system for the earth's natural pulsed electromagnetic field signal, which belongs to the field of earthquake precursor signal processing. Background technique [0002] Earthquakes have brought huge disasters to human life and seriously threatened the safety of human life and property. How to predict the occurrence of earthquakes highlights its necessity, which is also the expectation of all mankind. Since there is no accurate method in the field of earthquake precursor prediction research to predict the occurrence of earthquakes, it is necessary for new research on earthquake precursor prediction in order to find a better method to predict the occurrence of earthquakes. [0003] Earth's natural pulse small signal can be used for earthquake prediction before an earthquake occurs. The geomagnetic signal collected by the analysis of the earth's natural pulse small signal comes from a magneti...
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IPC IPC(8): G01V1/36
Inventor 郝国成白雨晓韩家斌陈忠昌康坊
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)