Wide-range harmonic magnetic resonance detection device and detection method based on pwm control technology
A detection method, magnetic resonance technology, applied in electron magnetic resonance/nuclear magnetic resonance detection, program control, computer control, etc., can solve problems such as signal loss, serious signal attenuation, failure to detect effective magnetic resonance signals, etc., and achieve suppression Instantaneous pulses, improve the quality of the transmitted waveform, and improve the effect of traditional tuning with long off-time
Active Publication Date: 2021-08-17
JILIN UNIV
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Problems solved by technology
[0003] Aiming at the problems mentioned in the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a wide-range harmonic magnetic resonance detection device based on PWM control technology, which solves serious signal attenuation, a large amount of signal loss, and it is almost impossible to detect effective magnetic resonance. problem with resonant signal
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[0096] Now according to the actual detection, it is determined that the equivalent parameters of the coil are L=0.8mH, R=1Ω, and the specific implementation steps of the actual detection are as follows:
[0097] Step 301: The STM32+FPGA transceiver main control module 2 identifies the parameters sent by the PC host computer 1 and the start signal, including the excitation current I m =50A, the number of superposition k=1, the number of emission currents M=1 and the excitation pulse frequency f=2330Hz, calculate the emission pulse time t≈39.914ms and the number of pulse cycles n=93, and return the actual excitation time t to PC upper computer 1;
[0098] Step 302: STM32+FPGA transceiver main control module 2 controls the switch drive module 12 in the transceiver switching device to control the transceiver switch 13 to switch the transceiver integrated coil 14 to be connected to the preamplifier circuit 15 of the receiving system, and is ready to enter the gain adjustment and n...
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The present invention relates to a wide-range harmonic magnetic resonance detection device and detection method based on PWM control technology, including a PC upper computer sending transmission parameters to an STM32+FPGA transceiver main control module, displaying working status and storing collected magnetic resonance signal data; The transmitting system includes a storage battery, which charges the energy storage capacitor after being converted by a DC-DC converter, and is connected to the H-bridge transmitting module through a high-power diode, and the H-bridge transmitting module is connected to a controllable constant voltage source through a low-power diode; STM32+FPGA transceiver The main control module drives the H-bridge transmitter module through the PWM drive module; the PWM drive module is connected to the transceiver switching device through a bidirectional diode; the receiving system is connected to the transceiver integrated coil through the control of the transceiver switching device; The connection between the transmitting system or receiving system and the transceiver integrated coil. It solves the problem of long off-time of traditional matching and reduces the dead time of the magnetic resonance detection device when the integrated coil for transmitting and receiving is used for transmission.
Description
technical field [0001] The invention relates to the field of geophysical exploration equipment, in particular to a wide-range harmonic magnetic resonance detection device and detection method based on PWM control technology. Background technique [0002] Ground magnetic resonance technology (Magnetic Resonance Sounding, MRS) is an effective geophysical detection method, which is widely used in shallow groundwater detection, disaster water source detection and other fields. During magnetic resonance detection, the transmitting system emits excitation pulses through the transmitting coil to excite hydrogen protons in water, and then the receiving system collects the magnetic resonance signals induced by the receiving coil. Since the current magnetic resonance detection technology adopts the LCR series resonance method to transmit, the transmitting coil can be equivalent to a series connection of an inductance and a resistance, and then connected in series with a capacitor of a...
Claims
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IPC IPC(8): G01V3/14H03K7/08G05F1/46G05F1/571G05B19/042
CPCG01V3/14G05B19/0421G05B19/0423G05B2219/21137G05B2219/2214G05F1/461G05F1/571H03K7/08
Inventor 张洋李苏杭严复雪殷光耀林君
Owner JILIN UNIV