A high-precision coherent population-confined cpt rubidium atom magnetometer

A technology of coherent population trapping and magnetometer, which is applied to the size/direction of the magnetic field and the use of magneto-optical equipment for magnetic field measurement. It can solve the problems of insufficient sensitivity and absolute accuracy, and achieve high sensitivity, small size and improved measurement. The effect of precision
CN109799468BActive Publication Date: 2021-07-27CHINA JILIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA JILIANG UNIV
Publication Date
2021-07-27

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Abstract

The invention discloses a high-precision coherent population trapped CPT rubidium atom magnetometer, including a VCSEL laser, a collimating lens, an electro-optic modulator, a λ / 2 wave plate, a polarization beam splitter prism, a reflector, a λ / 4 wave plate, and ITO Heater, atomic gas chamber, photoelectric detector, feedback module, temperature control module, data acquisition module, host computer, circuit control module and 3.417GHz microwave source. After the laser is modulated, the left-handed circularly polarized light and the right-handed circularly polarized light with equal light intensity pass through the atomic gas cell to generate two CPT signals, which are differentially processed to obtain the Larmor precession frequency, and then according to the Larmor precession frequency The relationship between the dynamic frequency and the strength of the magnetic field, to achieve accurate measurement of the magnetic field. The invention adds a feedback system and a new type of atomic gas chamber, has the advantages of high precision, high sensitivity, low power consumption, small volume, etc., and has important application value in biomedicine, geophysics, military detection and the like.
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Description

technical field

[0001] The invention relates to a high-precision coherent population trapped CPT rubidium atomic magnetometer, which belongs to the technical field of atomic magnetometers. Background technique

[0002] In modern technology, magnetic detection technology is widely used. Magnetic field measurement can be used in geophysical research, oil and gas and mineral exploration, military defense, medical diagnosis, geological survey and archaeological research and other fields. Among them, weak magnetic detection is a very important and promising research direction. At present, superconducting quantum interference devices (Superconducting Quantum Interference Device) are mainly used for weak magnetic detection, which has high sensitivity for the measurement of weak magnetic fields, but the magnetometer device is complex, has high requirements for the working environment, and high maintenance costs. Poor universality is not conducive to the research and development of...

Claims

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