Closed-loop detection system for low-field nuclear magnetic resonance Larmor frequency
A low-field nuclear magnetic resonance and closed-loop detection technology, which is applied in the direction of using nuclear magnetic resonance for analysis, etc., can solve the problems of high detection accuracy and no consideration of magnetic field strength errors, etc.
Pending Publication Date: 2022-03-25
NINGBO UNIV
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Problems solved by technology
However, when the sensor measures the magnetic field strength of the main magnetic field, it does not consider the magnetic field strength error caused by the detection environment and the accuracy of the magnetic field strength measuring instrument. NMR Larmor frequency, so that the final detection accuracy needs to be quite high
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[0010] Example: figure 1 As shown, a closed-loop detection system of a low field nuclear magnetic resonance Larmor frequency includes an embedded microprocessor, a radio frequency signal generator, a radio frequency power amplifying circuit, a radio frequency switching circuit, a low noise preamplifting circuit, an internal difference lock amplifying circuit, and Analog-to-digital conversion circuit; the embedded microprocessor has an input, output terminal, and the control terminal, the RF switch circuit is implemented with a single-knife double-throw switch circuit, has a common end, a first end, a second end, and a control terminal, an embedded microprocessor. The input end of the output terminal and the radio frequency signal generator, the output terminal of the radio frequency signal generator and the input of the radio frequency power amplifier circuit, the output terminal of the radio frequency power amplifier circuit and the first end of the radio frequency switch circuit...
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The invention discloses a low-field nuclear magnetic resonance Larmor frequency closed-loop detection system which comprises an embedded microprocessor, a radio frequency signal generator, a radio frequency power amplification circuit, a radio frequency switch circuit and a low-noise pre-amplification circuit. In consideration of influence of factors such as a detection environment, magnet processing precision and a magnet structure design error on magnetic field intensity, a magnetic field intensity range is determined in advance, then a corresponding sweep frequency range is determined based on the magnetic field intensity range, periodic sweep frequency is carried out in the sweep frequency range, and a digital packet signal corresponding to each sweep frequency is obtained. And finally, taking the sweep frequency bound with the digital envelope signal with the maximum signal amplitude as the detected Larmor frequency. The method has the advantages that the detection result is not affected by factors such as the detection environment, the magnet machining precision and the magnet structure design error, and the Larmor frequency detection precision is high.
Description
Technical field [0001] The present invention relates to a detection system of a low field nuclear magnetic resonance Larmor frequency, and more particularly to a closed-loop detection system for a low field nuclear magnetic resonance Larmor frequency. Background technique [0002] Nuclear magnetic resonance detection technology is a widely used in detecting techniques in the fields of biomedical, non-destructive testing, petroleum exploration. The technique utilizes the interaction between the atom magnetic and the external magnetic field, and analyzes the produced nuclear magnetic resonance signals to determine the subject. Because of the main magnetic field B 0 There are countless protons in the inspection substance in motion, in the main magnetic field B 0 The component of the magnetic moment in the X and Y-axis direction will be canceled, and the magnetic torque component in the z-axis direction is superimposed to form a longitudinal magnetization vector, and the longitudinal...
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IPC IPC(8): G01N24/08
CPCG01N24/08
Inventor 邹庭浪邬杨波倪海燕谢建军郭智勇
Owner NINGBO UNIV