Large magnetic moment transmitter generating bipolarity trapezoidal current, and current generating method

Abstract

The invention discloses a large magnetic moment transmitter generating bipolarity trapezoidal current, and current generating method, which relate to the technical field of aviation transient electromagnetic exploration. The transmitter comprises a trapezoidal current constant voltage clamp circuit, current overshoot inhibition circuit, a transmitter master control circuit, and other parts. The invention is advantageous in that through the trapezoidal current constant voltage clamp circuit based on the passive constant voltage clamping method, the falling edge of current is rapidly shut down linearly, and the rising edge of current is rapidly raised linearly, and thereby the bipolarity trapezoidal current is formed; with the design of the current overshoot inhibition circuit, the effect time of a damping resistor can be controlled, and the current tail oscillation can be effectively removed; a bipolarity trapezoidal current generation method is brought forward based on the transmitter,and thereby a great significance of application is achieved in improvement of the quality of the emitted current waveform and in promotion of the detection performance of the aviation transient electromagnetic exploration system.

Description

technical field [0001] The invention relates to the technical field of aerial transient electromagnetic exploration, in particular to a bipolar trapezoidal current large magnetic moment transmitter and a current generation method thereof. Background technique [0002] The airborne transient electromagnetic prospecting system is one of the important means to detect electrical abnormal ore bodies, especially metal mines. It has the characteristics of low cost, high speed and good trafficability. Rapid resource evaluation can realize rapid exploration of large-scale mineral resources, and its flying platforms mainly include fixed-wing aircraft and helicopters. The airborne transient electromagnetic method is a time-domain artificial source electromagnetic detection method based on electromagnetic induction. The pulse current is sent underground through the multi-turn coil suspended under the aircraft to generate a pulse magnetic field (primary field). Under the excitation of t...

AI Technical Summary

Problems solved by technology

[0008] The traditional waveform current transmitter and current generation method in the airborne transient electromagnetic exploration system have the following technical defects: 1) In the case of a large equivalent inductance of the transmitting coil, if the transmission current is required to be as high as hundreds of amperes, the power consumption The time is quite long, and it takes hundreds of milliseconds to reach the current peak value, that is, the rising edge of the current cannot be rapidly increased; although the method of capacitor energy storage can effectively increase the rising time of the current, the falling edge of the emission current is exponentially and slowly decreasing; 2 ) The damping resistance of the current overshoot suppression circuit is connected in parallel at both ends of the transmitting coil at all times, which will increase the power consumption of the transmitter, which does not meet the requirements of efficient energy utilization of aviation transient electromagnetic systems

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