Open AccessA method for calibrating coil constants by using the free induction decay of noble gases
Author(s) -
Linlin Chen,
Binquan Zhou,
Guanqun Lei,
Wenfeng Wu,
Jing Wang,
Yueyang Zhai,
Zhuo Wang,
Jiancheng Fang
Publication year - 2017
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4985742
Subject(s) - larmor precession , free induction decay , electromagnetic coil , gyroscope , amplitude , atomic physics , pulse (music) , noble gas , magnetometer , precession , time constant , pulse duration , physics , nuclear magnetic resonance , resonance (particle physics) , induction coil , computational physics , chemistry , optics , magnetic field , spin echo , laser , condensed matter physics , detector , magnetic resonance imaging , quantum mechanics , medicine , electrical engineering , engineering , radiology
We propose a precise method to calibrate the coil constants of spin-precession gyroscopes and optical atomic magnetometers. This method is based on measuring the initial amplitude of Free Induction Decay (FID) of noble gases, from which the π/2 pulse duration can be calculated, since it is inversely proportional to the amplitude of the π/2 pulse. Therefore, the coil constants can be calibrated by measuring the π/2 pulse duration. Compared with the method based on the Larmor precession frequency of atoms, our method can avoid the effect of the pump and probe powers. We experimentally validated the method in a Nuclear Magnetic Resonance Gyroscope (NMRG), and the experimental results show that the coil constants are 436.63±0.04 nT/mA and 428.94±0.02 nT/mA in the x and y directions, respectively
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