Nuclear magnetic resonance water-finding instrument transmitting apparatus and detecting method

Abstract

The invention provides a nuclear magnetic resonance water-finding instrument transmitting apparatus and a detecting method. The transmitting apparatus includes a power supply, a transmitting bridge, a hysteresis feedback circuit, a CPLD module and a current sensor. The invention also provides a detection method. The method comprises the following steps: inputting an expected output parameter value to a transmitter upper computer platform, the CPLD module outputting an instruction current based on the upper computer instruction, the hysteresis feedback circuit real-time processing an instruction signal and a transmitting signal, converting a feedback signal to a drive signal of a switch device in a transmitting circuit bridge arm, such that an output sine current is enabled to real-time track the instruction signal. The transmitting apparatus has small size and is light in weight, and can output the sine current having high amplitude of frequency conversion. The method is advantaged in that the method can easily change the frequency and amplitude of the current transmitted, and the amplitude of the instruction current is changed to zero instantly through control, and enable the current output by a transmitting coil to be free of smearing.

Description

technical field [0001] The invention relates to a nuclear magnetic resonance water finder launch device and a detection method, in particular to a nuclear magnetic resonance water finder launch device and a detection method based on a hysteresis loop current tracking control method, belonging to the field of geophysical detection instruments. Background technique [0002] In the detection process of the nuclear magnetic resonance water detector, the two main parts are the high-power transmitting device and the weak signal detection. The function of the transmitting system is to emit high-power sinusoidal alternating pulses underground to generate an exciting magnetic field, which excites hydrogen protons in groundwater to cause nuclear magnetic resonance; the function of the receiving system is to condition and detect MRS signals. Among them, the main principle of the high-power transmitting device is that the transmitting system generates alternating high-amplitude sinusoid...

AI Technical Summary

Problems solved by technology

[0003] In the past, the transmitting device of the nuclear magnetic resonance water finding instrument used a series resonant circuit composed of a transmitting coil and a transmitting matching capacitor to generate a high-power sinusoidal current. However, due to the large volume of the capacitor box required for the matching capacitor, the The equipment is not easy to carry, and it takes a long time for the output sinusoidal current to reduce the amplitude to zero, etc.

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