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A multi-peak closed-loop non-directional dead zone CPT magnetic force measurement method

A magnetic measurement, non-directional technology, used in the use of magneto-optical equipment for magnetic field measurement, measurement device, measurement of magnetic variables and other directions, can solve problems such as disappearance and abnormal operation of magnetometers, to eliminate the influence of measurement accuracy and eliminate the magnetic field. Measurement error, the effect of avoiding mutual interference

Active Publication Date: 2022-04-12
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology

If the magnetic field is only measured by locking the two EIT signal peaks, if the direction of the laser and the magnetic field changes, the two locked EIT signals may disappear, and the magnetometer is working abnormally at this time, that is, the magnetometer has a measurement blind area

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  • A multi-peak closed-loop non-directional dead zone CPT magnetic force measurement method

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Embodiment Construction

[0034] The present invention will be further elaborated below in conjunction with embodiment.

[0035] The invention proposes a multi-peak closed-loop non-direction blind area CPT magnetometer measurement method, which solves the problem that there is a direction blind area when two EIT signals are used for measurement, and the measurement mode needs to be switched. The present invention adopts the method of simultaneously closed-loop locking four EIT signals, no matter how the magnetic field direction changes, it can ensure that at least two EIT signals can provide magnetic field measurement, that is, realize the CPT magnetometer with no direction blind zone.

[0036] Such as figure 1 As shown, a multi-peak closed-loop non-directional blind zone CPT magnetometer measurement method mainly includes the following steps:

[0037] Step 1. Generate frequency f 0 A single-frequency microwave signal; the generated modulation frequency is f m , the FM range is A m The modulation s...

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Abstract

The invention relates to a multi-peak closed-loop non-directional blind zone CPT magnetic force measurement method, which belongs to the microwave frequency locking field of a CPT magnetometer; step 1, input the generated single-frequency microwave signal and modulation signal to a laser, and modulate the laser emitted by the laser ; Step 2, the modulated laser light is injected into the glass air chamber, and the EIT signal is demodulated by measuring the change of the transmitted light power; Step 3, changing the center frequency of the microwave signal in turn; Step 4, adopting the phase-sensitive detection method, sequentially Obtain the differential signal of the EIT signal under different center frequencies of the microwave signal; step five, calculate the total error signal P'(B); step six, adjust the external magnetic field value B to be measured through the digital PID controller, so that the total error signal P'(B ) is zero; then the B value at this time is the magnetic field value to be measured; the present invention realizes a CPT magnetometer with no direction blind zone, and does not need to switch the measurement mode when the magnetic field direction changes, which can ensure the continuous measurement of the magnetic field.

Description

technical field [0001] The invention belongs to the microwave frequency locking field of a CPT magnetometer, and relates to a multi-peak closed-loop non-directional blind zone CPT magnetic force measurement method. Background technique [0002] The CPT magnetometer has the characteristics of small size, low power consumption, high precision, and no direction blind zone. It is expected to replace the optical pump magnetometer and be used in the fields of space magnetic measurement, marine magnetic measurement, and aerial magnetic measurement. [0003] The CPT magnetometer is based on the Zeeman splitting phenomenon of the atomic fine structure energy level in the magnetic field, and realizes the measurement of the magnetic field by detecting the transmission spectral characteristics caused by the interference between the two transition channels of the atom. In the ∧-type three-level system, the energy level |1>, |2> is the ground state energy level, and |3> is the ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/10G01R33/032
CPCG01R33/10G01R33/032
Inventor 邓意成王学锋张笑楠卢向东桑建芝李明阳徐强锋李建军
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES