Phase-sensitive detecting circuit used for focusing dual-frequency induced polarization method

Abstract

The invention discloses a phase-sensitive detecting circuit used for a focusing dual-frequency induced polarization method. The phase-sensitive detecting circuit is characterized by comprising a program-controlled band pass filtering circuit 1, a high-frequency photo-sensitive detecting circuit 2, a high-frequency photo-sensitive detecting circuit 4, a low-frequency photo-sensitive detecting circuit 5, a low-frequency photo-sensitive detecting circuit 7, a high-frequency reference signal circuit 3, a low-frequency reference signal circuit 6, a high-frequency integral circuit 8, a high-frequency integral circuit 9, a low-frequency integral circuit 10 and a low-frequency integral circuit 11. The program-controlled band pass filtering circuit 1 performs high-frequency and low-frequency band pass filtering on an input signal under the control of a single-chip microcomputer, the signal is connected with the input signal ends of the high-frequency photo-sensitive detecting circuit 2, the high-frequency photo-sensitive detecting circuit 4, the low-frequency photo-sensitive detecting circuit 5 and the low-frequency photo-sensitive detecting circuit 7 after being subjected to band pass filtering, and the reference signal ends of the high-frequency photo-sensitive detecting circuit 2, the high-frequency photo-sensitive detecting circuit 4, the low-frequency photo-sensitive detecting circuit 5 and the low-frequency photo-sensitive detecting circuit 7 are connected with the high-frequency reference signal circuit 3 and the low-frequency reference signal circuit 6 respectively. The signal is output through the high-frequency integral circuit 8, the high-frequency integral circuit 9, the low-frequency integral circuit 10 and the low-frequency integral circuit 11 respectively after being subjected to phase-sensitive detecting. By utilizing the phase-sensitive detecting circuit, high-precision synchronous detection of amplitude values and phase positions of the dual-frequency induced polarization signal can be achieved.

Description

technical field [0001] The invention relates to a phase-sensitive detection circuit for electrical prospecting, in particular to a phase-sensitive detection circuit which can be used for focusing the excitation voltage signal in a dual-frequency induction method instrument. Background technique [0002] The degree of mechanization of my country's coal mining methods is gradually increasing, and the requirements for working efficiency of fully mechanized excavation face are getting higher and higher. During the excavation process, the principle of "prediction and forecasting, excavation must be excavated, exploration before excavation, treatment before mining" must be followed to ensure the safe production of personnel and machines in the working face. At present, the advanced detection methods of underground coal mine roadways include mine direct current method, mine transient electromagnetic method, mine geological radar detection method, Rayleigh wave method and mine seism...

AI Technical Summary

Problems solved by technology

These geophysical prospecting methods have the following problems: low detection accuracy, poor real-time performance, poor directionality, low efficiency, high cost, poor anti-interference ability, and excavation separation, etc., which cannot fully meet the requirements of advanced detection for excavation.

Central South University (Patent No. CN1034276) proposed to use the Fourier transform coherent to extract high-frequency real components, high-frequency imaginary components, low-frequency real components, and low-frequency imaginary components from the amplified and filtered IP signals. The main problem is coherent detection The accuracy is affected by the bandpass filter circuit

Images