DocumentCode :
70614
Title :
Extended Bandwidth Lorentz Force Magnetometer Based on Quadrature Frequency Modulation
Author :
Mo Li ; Sonmezoglu, Soner ; Horsley, David A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of California at Davis, Davis, CA, USA
Volume :
24
Issue :
2
fYear :
2015
fDate :
Apr-15
Firstpage :
333
Lastpage :
342
Abstract :
In this paper, a Lorentz force magnetometer demonstrates quadrature frequency modulation operation. The Lorentz force magnetometer consists of a conventional 3-port resonator, which is put into oscillation by electrostatic driving and sensing. The bias current flowing through the resonator is proportional to the displacement, and generates Lorentz force in quadrature with the electrostatic force. As a result, the Lorentz force acts as an equivalent spring and the magnetic field can be measured by reading the change in oscillation frequency. The sensor has a sensitivity of 500 Hz/T with a short-term noise floor of 500 nT$surd $ Hz. The bandwidth of the sensor is increased to 50 Hz, a factor of 12 greater than that of the same resonator operating in amplitude-modulated mode. The short-term noise floor within 50-Hz bandwidth is comparable with CMOS Hall-effect sensors.
Keywords :
electrostatic devices; electrostatics; magnetic sensors; magnetometers; bandwidth 50 Hz; electrostatic driving; electrostatic force; electrostatic sensing; extended bandwidth Lorentz force magnetometer; quadrature frequency modulation operation; short-term noise floor; Frequency modulation; Lorentz covariance; Magnetic resonance; Magnetomechanical effects; Magnetometers; Oscillators; Magnetic sensors; magnetic sensors; magnetometers; microelectromechanical systems (MEMS); oscillators; oscillators.;
fLanguage :
English
Journal_Title :
Microelectromechanical Systems, Journal of
Publisher :
ieee
ISSN :
1057-7157
Type :
jour
DOI :
10.1109/JMEMS.2014.2330055
Filename :
6844815
Link To Document :
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