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Atomic magnetic gradient measuring device and measuring method based on distributed light modulation

A measuring device and optical modulation technology, which is applied in the magnetic field measurement, the size/direction of the magnetic field and other directions using magneto-optical equipment, can solve the problems of sensing unit crosstalk, difficult anti-interference effect, coupling of measurement results, etc., to avoid crosstalk , Improve anti-interference ability, avoid coupling effect

Active Publication Date: 2021-06-22
NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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Problems solved by technology

[0005] The atomic magnetic gradient measurement device requires the working atoms in the two sensing units to realize synchronous resonance excitation and synchronous precession detection. Cause crosstalk between them, make the measurement results coupled, and it is difficult to achieve better anti-interference effect

Method used

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  • Atomic magnetic gradient measuring device and measuring method based on distributed light modulation

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Embodiment

[0043] see figure 1 , an atomic magnetic gradient measurement device based on distributed light modulation, comprising a pump optical path module 1, a detection optical path module 2, an atomic gas chamber 3, a temperature control module 4, and a signal analysis control module 5;

[0044] The atomic gas chamber 3 comprises a first atomic gas chamber 301 and a second atomic gas chamber 302, the atomic gas chamber is an airtight light-through gas chamber, and the inside is filled with alkali metal atoms (such as potassium, rubidium, cesium), buffer gas (such as nitrogen ), quenching gas (such as helium).

[0045] The pumping optical path module is used to generate pumping laser light to polarize the alkali metal atomic medium in the first atomic gas chamber 301 and the second atomic gas chamber 302; the detection optical path module is used to generate detection laser light, and the detection laser light passes through The alkali metal atomic medium in the first atomic gas cham...

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Abstract

The invention discloses an atomic magnetic gradient measuring device and method based on distributed modulation, and the measuring device comprises a pump light path module, a detection light path module, atomic gas chambers, a temperature control module and a signal analysis control module. Two paths of pumping light passing through the two atomic gas chambers are subjected luminous power modulation. The same path of detection light passing through the two atomic gas chambers is subjected to spatially separated polarization state modulation, so that dual-channel atomic magnetic gradient measurement is realized on the premise of not increasing a laser light source and a detector, and the anti-interference capability of magnetic field measurement and the magnetic anomaly measurement sensitivity are effectively improved; power-modulated pump light is utilized to realize excitation of atomic spin in two atomic magnetic field channels, coupling between the two magnetic field measurement channels is effectively avoided by controlling the beam diameter and the advancing path of the pump light beam, complete isolation of atomic spin resonance excitation is realized, crosstalk between dual-channel magnetic measurement signals is avoided, and a more accurate magnetic gradient measurement result is obtained.

Description

technical field [0001] The invention relates to the technical field of quantum precision measurement, in particular to an atomic magnetic gradient measurement device and measurement method based on distributed light modulation. Background technique [0002] In the field of engineering, obstacles such as various underground pipelines, civil air defense projects, and old building foundations are important factors that affect the design and construction of high-rise buildings, municipalities, highways, railways, water conservancy and other engineering construction projects. Therefore, the distribution, properties and underground burial of these objects need to be ascertained before engineering design and construction. For the detection of ferromagnetic obstacles such as deep-buried trenchless metal pipelines, deep-buried civil air defense projects, and spud shoes, traditional detection methods are restricted by factors such as detection principle, detection accuracy, and detect...

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Application Information

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IPC IPC(8): G01R33/032
CPCG01R33/032
Inventor 徐馥芳李莹颖马明祥谢玉波万伏彬汪杰罗玉昆
Owner NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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