Broad spectrum current drive measuring system and measuring mode

Abstract

The invention is a broad-spectrum induced polarization (IP) measuring system, composed of transmitter and receiver, where the transmitter is composed of MCU, logic control circuit, switching circuit and power supply; the receiver composed of analog circuit, A / D converter, control logic circuit and power supply circuit; the receiver can provide a variable frequency and sweep frequency output supply square wave pulse, when transmitting, begins with high frequency, after transmitting a cycle of square wave each time, automatically changes pulse width to transmit doubled-width pulse, so the square wave is outputted from high to low frequency in a sweep frequency mode and circulates; the transmitter provides two-mode powder supply square wave pulse, one is positive, zero and negative, where duty factor is 1 : 1 : 1, and the other one is positive, positive, negative, positive, negative, negative, positive and negative; provides square waves at 4-8 kinds of pulse widths for supplying power underground, where the variation range of the pulse width include 62.5ms, 125ms, 250ms, 500ms, 1s, 2s, 4s and 8s. The receiver synchronizes with the transmitter in time by receiving the wireless synchronous signal transmitted by the transmitter, and collects 4-channel ground broad-spectrum induced polarization signals according in a high-to-low frequency sequence.

Description

Technical field: [0001] The invention belongs to geophysical prospecting equipment, and relates to a device and method for measuring electrical variables for ore prospecting. Background technique: [0002] Underground media, including oil reservoirs, metal mines, groundwater, natural gas, etc., can be considered as resistance-capacitance networks from an electrical point of view. Different material components have different resistance-capacitance characteristic values. When subjected to an external electric field, an additional electric field that changes with time similar to charging and discharging will be generated in the limited underground space. This phenomenon is known as the induced polarization effect of rocks. The method of geological exploration using this physical mechanism is called induced polarization method, or IP method for short. The basic operation method of implementing IP detection is to provide a high-power artificial electric field underground in th...

AI Technical Summary

Problems solved by technology

Since both the transmitter and the receiver have preset operation programs, as long as the synchronization problem between the transmitter and receiver is solved, the receiver will automatically judge the power-off time and change the pulse width time, so that the measurement work can be carried out in an orderly manner

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