High-sensitivity magnetic field measurement method based on electron spin magnetic resonance linewidth narrowing

An electron spin and line width narrowing technology, which is applied in magnetic resonance measurement, magnetic field size/direction, etc., can solve the problems of low electron spin polarizability and limited magnetic field measurement sensitivity, so as to improve the magnetic field measurement sensitivity, Good consistency, the effect of reducing the volume of the whole table

Active Publication Date: 2020-04-24
BEIJING AUTOMATION CONTROL EQUIP INST
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Problems solved by technology

However, this measurement method also makes the polarizability of the electron spins lower, and the electron spins are relatively uniformly distributed in each hyperfine energy level
With the increase of electron spin density, the spin-exchange collision

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  • High-sensitivity magnetic field measurement method based on electron spin magnetic resonance linewidth narrowing

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Embodiment Construction

[0033] The present invention will be described in further detail below in conjunction with specific embodiments.

[0034] The invention adopts high power to drive the low hyperfine energy level of the ground state of the photopolarized electron spin. The magnetic resonance linewidth is narrowed by increasing the atomic polarizability, thereby improving the sensitivity of the magnetic field measurement. Firstly, the driving light frequency is set to correspond to the low hyperfine energy level of the electron spin ground state by the saturated absorption method, so as to meet the preconditions for realizing the narrowing of the magnetic resonance linewidth; The basis for judging the narrowing of the spin magnetic resonance linewidth; then by optimizing the driving optical power to increase the polarizability of the electron spin, the electron spin magnetic resonance linewidth narrowing is realized; finally, the high-sensitivity magnetic field measurement is realized by optimizi...

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Abstract

The invention discloses a high-sensitivity magnetic field measurement method based on electron spin magnetic resonance linewidth narrowing. The method comprises the following steps: step 1, setting adriving light frequency; step 2, performing electron spin magnetic resonance line width measurement; step 3, optimizing the power of driving light; and step 4, optimizing the electron spin density. The high-sensitivity magnetic field measurement method has the beneficial effect that the optically polarized electron spin ground state low ultrafine energy level is driven by high power; magnetic resonance linewidth narrowing is realized by improving the atomic polarizability, so that the magnetic field measurement sensitivity is improved; and the method is particularly suitable for a high-densityand small-size buffer gas chamber. On the one hand, the consistency of the buffer gas chamber is good, the yield is high, and the high-sensitivity magnetic field measurement method is suitable for engineering application; and on the other hand, the whole volume of the atom magnetometer is greatly reduced by adopting a high-density and small-volume air chamber, so that the atom magnetometer is applied to the hot spot fields of magnetoencephalogram, unmanned magnetic anomaly detection and the like; and the application range of the electron spin magnetic field measurement method is widened.

Description

technical field [0001] The invention belongs to a highly sensitive magnetic field measurement method, in particular to a highly sensitive magnetic field measurement method based on electron spin magnetic resonance line width narrowing, which is applicable to various weak magnetic field measurement fields. Background technique [0002] The measurement of the weak magnetic field signal can be realized by detecting the Larmor precession of the electron spin in the external magnetic field. The atomic magnetometer constructed based on this method has the characteristics of high sensitivity and stable scale factor, and has been widely used in various fields of magnetic field measurement. In recent years, with the development of cutting-edge technologies such as atomic gas chamber micromachining and high-power small-scale semiconductor lasers, driven by the demand for cutting-edge applications such as magnetoencephalography and unmanned magnetic anomaly detection, atomic magnetomet...

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Application Information

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IPC IPC(8): G01R33/24
CPCG01R33/24
Inventor 秦杰郭宇豪万双爱刘建丰王春娥薛帅孙晓光
Owner BEIJING AUTOMATION CONTROL EQUIP INST
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