Rostock 2019 – scientific programme

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A: Fachverband Atomphysik

A 26: Atomic systems in external fields

A 26.3: Poster

Wednesday, March 13, 2019, 16:15–18:15, S Fobau Physik

The precision measurement based on thermal atom ensemble — •Ke Zhang — Beijing Computational Science Research Center

The precision measurement based on thermal atom ensemble is an important research direction in recent years. We introduce several measurement devices based on thermal atoms, including alkali magnetometer, Nuclear magnetic resonance gyroscope (NMRG) and a rotating sensor. The atomic spin has a fixed axis and the polarized atoms rotate by the external magnetic field. The precession frequency is dependent on the magnitude of the external magnetic field. The atomic magnetometer can measure the magnetic field through detecting the atomic spin precession frequency. At present, the atomic magnetometer has high theoretical and experimental sensitivity. NMRG can also measure the angular velocity by the detected atomic spin precession frequency, which include the larmor precession frequency and rotating rate of the carrier. The atomic larmor precession frequency $\gamma B_0$ is known, then we can deduce the angular velocity of the carrier. Atomic spin gyroscope has the advantages of high precision, simple structure, small volume, which make it become one of the most important research direction of gyroscope in the future. Besides, We demonstrate a prototype of rotation sensor based on alkali-metal vapor cell. This sensor continuously measures the angular displacement, and the information of angular velocity and angular acceleration can be extracted. This is useful in real-time observing the high-speed rotation of engines, and monitoring the rotation stability. Our work provides the possibility of developing rotation sensors with high- accuracy, compactness and low cost using atomic vapor cells.