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A modulation circuit for excitation source of differential carrier geophone

A technology of geophones and modulation circuits, which is applied in the direction of seismic signal receivers, etc., can solve problems such as signal distortion, waveform distortion, and frequency instability, and achieve the effects of stable amplitude, single frequency, and fast starting frequency

Inactive Publication Date: 2017-08-29
JILIN UNIV
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Problems solved by technology

[0004] In order to overcome the problems of signal distortion and frequency instability introduced by the traditional method due to waveform distortion and noise, the present invention proposes an excitation source modulation method for differential carrier geophones. According to the performance requirements of the geophone system, Its carrier frequency is a fast start-up single-frequency differential sine wave signal. The present invention proposes a method of excitation source modulation for a differential carrier geophone, comprising: a sine wave oscillation circuit, a signal conditioning circuit, a fast start-up circuit, Power supply unit and differential output unit

Method used

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  • A modulation circuit for excitation source of differential carrier geophone
  • A modulation circuit for excitation source of differential carrier geophone
  • A modulation circuit for excitation source of differential carrier geophone

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Embodiment Construction

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. An excitation source modulation method for a differential carrier geophone proposed by the present invention can effectively improve the signal quality driven by the geophone, and has a helpful effect on detection signal extraction, and uses a differential carrier sine wave driving method to minimize The common mode interference is reduced, the quality of the system driving signal is improved, and the stability and consistency of the system are improved.

[0021] figure 1 It is a schematic structural diagram of an excitation source modulation circuit according to an embodiment of the present invention, figure 2 It is a circuit diagram of an excitation source modulation...

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Abstract

The invention provides an excitation source modulation method used for a differential carrier geophone. A single-frequency differential sine wave signal which is rapid in oscillation starting and stable in frequency is produced by the method. A system according to the method comprises a sine wave oscillation circuit, a signal conditioning circuit, a rapid oscillation starting circuit, a power supply unit and a differential output unit. With the design of the rapid oscillation starting circuit and the signal conditioning circuit, oscillation starting capacity of the oscillation circuit is effectively enhanced and oscillation starting time is shortened. According to the method, output signals are single in frequency without distortion in waveform so that detection of long-period weak signals of the geophone is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of geophysics and address exploration, in particular to an excitation source modulation circuit for a differential carrier geophone. Background technique [0002] The differential carrier geophone is a sensor used in natural earthquakes, geological exploration and engineering surveys, which can convert tiny vibrations on the ground into electrical signals. The principle is to generate excitation signals for driving geophones through the excitation source generator The excitation signal generates a fixed electromagnetic field inside the geophone, and the geophone placed on the ground receives the weak vibration of the ground, and the seismic signal can be detected sensitively through the weak change of the variable capacitance in the electromagnetic field caused by the vibration. The quality of the output signal of the excitation source generating circuit in the geophone directly determines the sensitivity of...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/18
Inventor 邢雪峰林君
Owner JILIN UNIV
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