An automatic gain control circuit for electrical exploration
A technology of automatic gain control and electrical exploration, which is applied in gain control, amplification control, electrical components, etc., and can solve problems such as complex control algorithms and reduced detection efficiency.
Inactive Publication Date: 2016-07-06
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology
This method can select the optimal control strategy according to different interference environments, and realizes the correct and effective setting of the amplification factors of the amplifier circuits at all levels of the receiver. However, the existing problem is that the control algorithm is relatively complicated, which reduces the detection efficiency.
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[0015] The present invention will be further described below in conjunction with drawings and embodiments. This example should not be used to explain the limitation of the protection scope of the present invention.
[0016] In electrical prospecting, the induced polarization method needs to send excitation current to the ground through two power supply electrodes, and the commonly used excitation current waveform is a dual-frequency synthetic current waveform (such as figure 2 (a)), the underground medium has an induced polarization effect under the action of the excitation current, and generates an induced voltage signal (such as figure 2 (b)), because the dynamic range of the voltage signal is as large as ±1mV~±10V, and the previous methods cannot achieve the desired effect. Taking the detection method as an example, the principle and circuit of the present invention are further described.
[0017] refer to figure 1 . This embodiment includes a positive peak detection ...
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The invention discloses an automatic gain control circuit for electrical prospecting, which is characterized in that it is composed of a positive peak detection circuit, a reference voltage circuit, a signal amplification circuit, a voltage comparison circuit, at least two stages of amplification circuits and a filter circuit; The positive peak detection circuit detects the input signal and divides it into two circuits. The first circuit is directly connected to the comparison terminal of the voltage comparison circuit, the second circuit is connected to the comparison terminal after passing through the signal amplification circuit, and the reference voltage circuit is connected to the comparison terminal of the voltage comparison circuit. The comparison terminal is connected, the output terminal of the voltage comparison circuit is connected with the control terminal of the two-stage amplifying circuit, and the digital control signal generated by the voltage comparison circuit realizes automatic gain control by controlling the amplification factor of the two-stage amplifying circuit. Utilizing the invention, efficient and reliable automatic gain control for electrical prospecting signals can be realized.
Description
technical field [0001] The invention relates to an automatic gain control circuit for electrical prospecting, in particular to an automatic gain control circuit that can be used for processing excitation voltage signals in electrical prospecting instruments. Background technique [0002] In electrical prospecting, the voltage signal collected by the electrical prospecting signal receiver has the characteristics of a large dynamic range. Usually, the dynamic range of the voltage signal amplitude is ±1mV~±10V. In order to achieve effective amplification of various signals, the receiver should have an automatic gain control function. [0003] In terms of receiver magnification control, there are mainly three methods at present. The first method is that the user sets the magnification of the amplifier circuits at all levels. Receivers such as EH-4 produced by GEOMETRICS Company of the United States and V5-2000 and V-8 produced by Phoenix Company of Canada have adopted this met...
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IPC IPC(8): H03G3/20
Inventor 吴淼刘希高刘志民张金涛杜毅博周游吕一鸣李旭周剑锋郝建生马昭王学成王传武
Owner CHINA UNIV OF MINING & TECH (BEIJING)