By Topic

Enhancement in Sensitivity Using Multiple Harmonics for Miniature Fluxgates

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Jen-Tzong Jeng ; Inst. of Mech. & Precision Eng., Nat. Kaohsiung Univ. of Appl. Sci., Kaohsiung, Taiwan ; Jian-Hau Chen ; Chih-Cheng Lu

The miniature fluxgates, or microfluxgates, are magnetic field sensors promising in applications of modern portable electronic devices, e.g., motion trackers and digital compasses. In comparison with the bulky traditional fluxgates, the major drawback arising from miniaturization is the reduced sensitivity and the enhanced noise level. In this work, we proposed the method to enhance the sensitivity of a miniature fluxgate by adding up the responses of four even harmonics. Numerical simulation shows that the harmonic spectrum of the induced voltage waveform consists of high-order even harmonics when the excitation current is strong enough to saturate the magnetic cores. Since the magnitude of high-order even harmonics are comparable to that of the second harmonic, it is possible to enhance the sensitivity by detecting several important harmonics. To implement the multiple-harmonic detection technique, the sensitivity and noise of a parallel-gating miniature fluxgate is investigated using the proposed method. With the reference waveform consisting of square waves at 2nd, 4th, 6th, and 8th harmonics of excitation, the sensitivity of the sensor is found to be enhanced by a factor of 2.6 in comparison with the case for a 2nd-harmonic reference alone. The field noise level is found to be reduced from 0.5 nT/√Hz to 0.2 nT/√Hz. The proposed method is promising in improving the sensitivity and reducing the field noise of a chip-scale fluxgate.

Published in:

Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )