Method and apparatus of measuring weak magnetic field strength based on EIT

A technology for electromagnetic induction of transparent and weak magnetic fields, applied in the size/direction of the magnetic field and the use of magneto-optical equipment for magnetic field measurement, etc., which can solve the problems of large measurement errors and low sensitivity.

Inactive Publication Date: 2015-11-18
SHANXI UNIV
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Problems solved by technology

[0003] In order to solve the technical problem of low sensitivity and large measurement error of the current magnetic measuring device, the prese

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  • Method and apparatus of measuring weak magnetic field strength based on EIT
  • Method and apparatus of measuring weak magnetic field strength based on EIT
  • Method and apparatus of measuring weak magnetic field strength based on EIT

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Embodiment Construction

[0033] A device for measuring the strength of a weak magnetic field based on the electromagnetic induction transparency effect, comprising a detection laser 1, a first 1 / 2 glass slide 2 and a first PBS beamsplitter prism 3 sequentially located on the outgoing light path of the detection laser 1; the first PBS beam splitter The reflected optical path of the prism 3 is provided with a saturated absorption spectrum frequency stabilization device 4, and the signal output end of the saturated absorption spectrum frequency stabilization device 4 is connected with the voltage control port of the detection laser 1; The second 1 / 2 slide 5, the second PBS beam splitting prism 6, the atomic gas chamber 8 and the balance detector 9 that are filled with alkali metal atoms and have an incident window and an outgoing window on the side wall; the atomic gas chamber 8 is located at On the transmitted optical path of the second PBS dichroic prism 6; on the reflective optical path of the second P...

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Abstract

The invention provides a magnetic measurement apparatus based on atomic quantum effects, which is different from a present apparatus of measuring magnetic field strength. The method and apparatus of the invention utilize the energy level fission of high excitation state atoms caused by the Zeeman effect under the effect of a weak external magnetic field, and accurately controls the excitation frequency of an ultra-narrow line width laser to measure the spectral signal division based on EIT under the magnetic field effect. The intensity of a magnetic field to be measured can be calculated according to a division width. The multiple fission of the atomic magnetic energy level caused by the weak magnetic field Zeeman effect is linear, and accordingly, through fitting measurement results of widths of a plurality of division peak values, the self calibration of the intensity of the measured magnetic field can be realized. The new magnetometer can realize magnetic field intensity measurement with the sensitivity less than 0.1 T, and effectively improve the measurement precision with the further compression of a laser frequency line width. Moreover, the measured magnetic field strength can be effectively traced to an atom transition frequency, and excellent measurement accuracy and self-calibration can be realized.

Description

technical field [0001] The invention relates to a weak magnetic field strength measurement technology, in particular to a device and method for measuring weak magnetic field strength based on the electromagnetic induction transparency effect. Background technique [0002] Magnetic field measurement is a measurement technique for the relevant parameters of the magnetic field. The main measurement objects are: magnetic field strength, magnetic flux density, etc. There are mainly the following methods for measuring a constant magnetic field and calibrating equipment: a torque magnetometer made by using the force effect of a magnetic field, a fluxmeter, a galvanometer, and a shock method to measure the magnetic flux density and magnetic flux density of soft magnetic materials. Gate Magnetometer, Hall Effect Magnetometer and NMR Magnetometer, Rotating Coil Magnetometer, etc. The precise measurement of magnetic field strength has a wide range of applications. It has a wide range ...

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Application Information

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IPC IPC(8): G01R33/032
Inventor 张临杰杨文广赵建明贾锁堂
Owner SHANXI UNIV
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