Multi-isotope magnetic resonance signal excitation and detection method and apparatus

A magnetic resonance signal and detection method technology, applied in the direction of magnetic resonance measurement, etc., can solve the problems of complex single isotope process and high cost, and achieve the effect of enhanced signal strength, improved sensitivity, and improved accuracy

Active Publication Date: 2017-12-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process of extracting monoisotopes is complex and costly, especially for active alkali metal elements, which are usually used in atomic devices

Method used

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  • Multi-isotope magnetic resonance signal excitation and detection method and apparatus
  • Multi-isotope magnetic resonance signal excitation and detection method and apparatus
  • Multi-isotope magnetic resonance signal excitation and detection method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] see figure 1 , shows a schematic diagram of a Mz magnetometer according to a specific embodiment.

[0037] The outside of the Mz magnetic field meter has a magnetic shielding device 13, and the main part of the system is placed in the magnetic shielding device 13. The Mz magnetic field meter includes a first laser module 1, a collimator lens 2, and a polarizer along the beam direction. Device 3, 1 / 4 slide 4, steam chamber 5, working medium 6, laser beam 7, photodetector tube 8 and lock-in amplifier 9

[0038] Wherein the first laser module 1 emits monochromatic laser light, the first laser module 1 includes a laser light source and a light source drive module, exemplary, the laser light source can be a VCSEL, and the light source drive module can adjust the operating temperature and current of the laser to The laser wavelength is adjusted, for example, the operating temperature and current of the laser are adjusted so that the emission wavelength of the first laser is ...

Embodiment 2

[0053] Compared with the single-laser Mz magnetometer structure of Embodiment 1, the Mz atomic magnetometer of the multi-isotope chamber of the present invention can also be adapted to the double-laser Mz magnetometer structure.

[0054] see figure 2 , shows a schematic diagram of the Mz magnetometer according to this particular embodiment. Most of the embodiment 2 is the same as the embodiment 1, the only difference is that a second laser module 16 is also included, and the second laser module 16 passes through the steam chamber 5 through the reflection mirror 15 . The laser emitted by the second laser module is located on the energy level transition D1 line of the rubidium atom, and the wavelength emitted by the first laser is slightly deviated from the D1 of the rubidium atom. The first laser is initially selected to be the laser corresponding to the working atom D1 line. Since the tunable wavelength of the laser is small, the laser wavelength can be tuned to deviate fro...

Embodiment 3

[0061] Embodiment 3 is a modification of Embodiment 1.

[0062] see image 3 , shows a schematic diagram of the Mz magnetometer according to this particular embodiment. This embodiment 3 is mostly the same as embodiment 1, the only difference is that the AC magnetic field coils are two sets of AC magnetic field coils 10, and the two sets of AC magnetic field coils are respectively connected to the two driving signal generators, including different The AC signal of the modulated low-frequency AC signal is used as the external input of the signal generator to modulate the output of the signal generator, and the two driving AC signals are respectively modulated. With this structure, the same effect as that of Embodiment 1 can be achieved.

[0063] In Example 3, the steam chamber 5 is first heated, the temperature and current of the laser 1 are regulated, and the laser light 7 is passed through the steam chamber 5 and then subjected to photoelectric detection, and an absorption ...

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PUM

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Abstract

A multi-isotope magnetic resonance signal synchronous excitation and detection method and device thereof are disclosed. The measurement method comprises using a plurality of AC magnetic fields to simultaneously perform excitation and measurement on a work element containing a plurality of isotopes, wherein the number of AC magnetic fields is consistent with the number of isotopes and the ratio of center frequencies of the AC magnetic fields is constant and is the same as the ratio of magnetogyric ratios of the respective isotopes. The different AC magnetic fields use the same low frequency sinusoidal signal for modulation and detected signals are demodulated by another signal on the same frequency as the low frequency signal. The method and device of the invention save the process of extracting the isotopes of the element, save the cost, weaken the interference between the magnetic resonance signals of all the isotopes, are used in an Mz magnetometer, and improve the accuracy and sensitivity of the magnetic resonance signal extraction.

Description

technical field [0001] The present application relates to a magnetic resonance signal excitation and extraction method of an atomic device, which belongs to the field of atomic devices and magnetic field detection. Specifically, it relates to a method and device for synchronous excitation and detection of magnetic resonance signals that simultaneously excite multiple isotopes. Background technique [0002] Atomic devices using magnetic resonance signals (such as atomic magnetometers) have extremely wide applications, including underground detection, positioning and navigation, and biomedical fields. For example, the detection of human brain magnetism and heart magnetism can be used to diagnose some diseases. In these applications, the magnetic field signals involved are very weak, so high sensitivity is a crucial parameter for such atomic devices. In recent years, with the advancement of the manufacturing process, the technology related to atomic devices has been greatly dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/32G01R33/26
Inventor 尚金堂甘琦
Owner SOUTHEAST UNIV
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