A Very Weak Magnetic Measurement Device Based on Composite Gas Chamber

Abstract

The invention discloses an extremely weak magnetic measurement device based on a composite gas chamber, which integrates the alkali metal gas chamber and the sample channel of the extremely weak magnetic measurement system based on no spin exchange relaxation, and optimizes the external interface of the composite gas chamber. Matte surface treatment and shading film evaporation are carried out on the inner channel and the inner channel respectively, and finally the extremely weak magnetic field measurement is realized with the differential detection optical path. The invention greatly reduces the distance between the core sensitive area and the object to be measured, optimizes the system structure and improves the environmental adaptability, which is beneficial to expand the related technology of extremely weak magnetic measurement based on spin-free exchange relaxation in biomedicine and material science. applications in other fields.

Description

technical field [0001] The invention relates to the field of extremely weak magnetic measurement, in particular to an extremely weak magnetic measurement device based on a composite gas chamber. Background technique [0002] Extremely weak magnetic measurement has important scientific significance and application value in the fields of basic physics, life science, material science, etc. With the continuous development of quantum optical technology and magnetic shielding technology, the extremely weak magnetic measurement based on the relaxation effect without spin exchange The system has become the focus and focus of related research. At present, most of these extremely weak magnetic measurement systems measure the extremely weak magnetic signals of the object to be tested outside the alkali metal gas chamber in a magnetic shielding environment. In order to obtain a better measurement signal-to-noise ratio, the excitation and detection optical paths generally focus on The c...

AI Technical Summary

Problems solved by technology

At present, most of these extremely weak magnetic measurement systems measure the extremely weak magnetic signals of the object to be tested outside the alkali metal gas chamber in a magnetic shielding environment. In order to obtain a better measurement signal-to-noise ratio, the excitation and detection optical paths generally focus on The center of the air chamber makes the core sensitive area a certain distance from the object to be measured, which makes the weak magnetic signal strength further attenuate with the increase of the distance

At the same time, because the extremely weak magnetic measurement system based on the non-spin exchange relaxation effect relies on multi-layer nested devices such as shielding cylinders, coils, and ovens to realize the measurement function, which leads to complex structure of the measurement system, narrow space around the gas chamber, and It is difficult to fix the DUT and other problems, and it is difficult to meet the test requirements of various DUTs

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