Novel radio frequency excitation system based on overhauser effect

A radio frequency excitation, a new type of technology, applied in the re-radiation of sound waves, radio wave measurement systems, and the use of re-radiation, etc., can solve the problems affecting the quality of Larmor precession signal acquisition, unfavorable radio frequency polarization of free radical solutions, and the sensitivity of magnetometers influence and other issues, to achieve the effect of easy tuning, high degree of polarization, and simple polarization mode

Pending Publication Date: 2020-08-14
JIANGSU UNIV
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Problems solved by technology

For the capacitance-loaded coaxial resonant cavity, since its resonant frequency is related to various parameters such as the size of the resonant cavity and the tuning capacitance value, it is necessary to change the parameters such as the size of the resonant cavity and the tuning capacitance value at the same time to carry out various simulation experiments. Huge amount, more difficult
For the ...

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  • Novel radio frequency excitation system based on overhauser effect
  • Novel radio frequency excitation system based on overhauser effect
  • Novel radio frequency excitation system based on overhauser effect

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0037] The novel radio frequency system based on the overhauser effect of the present invention includes a radio frequency signal source module, a radio frequency power amplification module and a radio frequency excitation module which are sequentially connected by signals. Such as figure 1 As shown, the RF signal source module includes a single-chip microcomputer (MCU) connected with a digital frequency synthesizer (AD9959), a 25MHZ crystal oscillator, and the digital frequency synthesizer (AD9959) is also connected with a 200MHZ low-pass filter; the MCU controls the AD9959 to generate a radio frequency excitation signal, The RF excitation signal is filtered and output by a 200MHZ low-pass filter. Such as figure 2 As shown, the RF power amplifier module includes a 3db...

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Abstract

The invention provides a novel radio frequency excitation system based on an overhauser effect, which belongs to the technical field of magnetic field measurement sensors. The system comprises a radiofrequency signal source module, a radio frequency power amplification module and a radio frequency excitation module. The radio frequency excitation module adopts an Alderman-Grant coil to replace atraditional structure, the quality factor of the coil is higher, the sensitivity of an output signal is improved, and the polarization degree of a working substance in the overhauser magnetometer is high. Under the condition that the size of the coil is fixed, the resonant frequency required by the coil can be obtained only by adjusting the tuning capacitance value in the simulation process, so that the coil can adapt to different working substances. The coil equivalent circuit is simple in structure, and the coil can be tuned in a required frequency range more easily.

Description

technical field [0001] The invention belongs to the technical field of magnetic field measurement sensors, in particular to a novel radio frequency excitation system based on the overhauser effect. Background technique [0002] The proton magnetometer is an important scientific instrument for measuring the geomagnetic field. The ordinary proton magnetometer mainly adopts the static polarization method. By passing direct current to the coil, the excitation current is cut off after a period of time. At this time, a magnetic field is induced on the coil. A Larmor precession signal, the precession frequency of the signal has a certain proportional relationship with the strength of the earth's magnetic field, and the total strength of the earth's magnetic field can be calculated by measuring the precession frequency of protons. However, in the static polarization mode, the degree of proton excitation is low, so that the amplitude of the output signal is extremely weak, and the se...

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Application Information

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IPC IPC(8): G01V3/40
CPCG01V3/40
Inventor 张柏和
Owner JIANGSU UNIV
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