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Semiconductor magnetic sensor-based rapid tracking and tuning method for Overhauser magnetometer

A magnetic sensor and semiconductor technology, used in electrical/magnetic exploration, instruments, scientific instruments, etc., can solve the problems of signal amplitude fluctuation and low harmonic matching accuracy, and achieve improved harmonic matching accuracy, high-precision measurement, and economical harmonic matching. effect of time

Active Publication Date: 2019-04-09
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an Overhauser magnetometer based on a semiconductor magnetic sensor in view of the technical problems of signal amplitude fluctuations and low tuning accuracy in the current matching method used in special marine magnetic survey activities. The fast track tuning method solves the above technical defects

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  • Semiconductor magnetic sensor-based rapid tracking and tuning method for Overhauser magnetometer

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Embodiment Construction

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0026] A fast-tracking tuning method based on a semiconductor magnetic sensor to reduce the probability of sensor mistuning and improve tuning accuracy. Firstly, a semiconductor magnetic sensor with low sensitivity but small volume is used as an auxiliary sensor for tuning to obtain a rough value of the local geomagnetic field, and then converted to the corresponding capacitance value for preliminary tuning, and finally a small-scale accurate search.

[0027] Step 1. Use a semiconductor magnetic sensor with low sensitivity but small volume to obtain a rough value F of the local geomagnetic field, according to the geomagnetic field F and the FID signal angular frequency f 0 The relationship to get the frequency f of the ...

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Abstract

The invention provides a semiconductor magnetic sensor-based rapid tracking and tuning method for an Overhauser magnetometer. The method comprises the following steps of acquiring a rough value F of ageomagnetic field by utilizing the semiconductor magnetic sensor, and determining a value of f0 according to a relation between the geomagnetic field F and a frequency f0 of an FID signal; preliminarily determining a capacitance value C of a tuning capacitor of the Overhauser magnetometer according to the f0; and according to the obtained capacitance value C of the tuning capacitor, preliminarilydetermining an actual tuning capacitor value Cm of a tuning circuit, adjusting the actual tuning value Cm up and down, searching for an optimal tuning value C0, detecting a peak value of the FID signal according to a peak detector, and when the peak value is maximum, indicating that the circuit is in a resonance state, at the moment, determining that the tuning is successful, stopping the search,and then starting frequency measurement.

Description

technical field [0001] The invention relates to a fast tracking and matching method for an Overhauser magnetometer based on a semiconductor magnetic sensor. Background technique [0002] According to the principle of the Overhauser effect, the proton magnetic moment will undergo Larmor precession under the action of an external magnetic field, and the relationship between its angular frequency f and the external magnetic field F is: In the formula, γp is the gyromagnetic ratio (constant) of the proton, so the frequency of the FID signal is proportional to the geomagnetic field and is not affected by external interference. Therefore, the external frequency can be obtained by measuring the frequency of the FID signal obtained by Larmor precession. The size of the magnetic field. The accuracy of FID signal frequency measurement directly determines the accuracy of geomagnetic field measurement, and improving the FID signal-to-noise ratio can improve its measurement accuracy. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38G01V3/40
CPCG01V3/38G01V3/40
Inventor 葛健李晗董浩斌邱香域罗望李瑞鹏王冠中杨宣
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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