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Injection-locking benefits for weak AC magnetic field detection in Coupled-Core Fluxgate Magnetometers
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Ando, B., Baglio, S., Trigona, C., Bulsara, A.R., Stocks, Nigel G. and Nikitin, A. (2012) Injection-locking benefits for weak AC magnetic field detection in Coupled-Core Fluxgate Magnetometers. In: 2012 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2012, Graz, Austria, 13 - 16 May 2012. Published in: 2012 IEEE I2MTC - International Instrumentation and Measurement Technology Conference, Proceedings (Article number 6229707). pp. 318-322. doi:10.1109/I2MTC.2012.6229707
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Official URL: http://dx.doi.org/10.1109/I2MTC.2012.6229707
Abstract
Recent theoretical and experimental efforts have shown that spontaneous oscillations can be induced by unidirectionally coupling overdamped nonlinear systems, subject to the appropriate system conditions; these oscillations are triggered by a control parameter, the coupling strength, exceeding a threshold value. These concepts have been exploited in the practical realization of a Coupled Core Fluxgate Magnetometer (CCFG) wherein an odd number of wound ferromagnetic cores are coupled in a ring oscillator configuration (cyclic boundary conditions). This scheme yields better signal detection performance, compared to its single-core counterpart, when one uses the CCFG to detect weak dc target magnetic fields. In this paper, we consider the effects of injection-locking by an externally applied time-sinusoidal magnetic field. Injection locking is the locking of the oscillator frequency to the reference source (the "locking signal") with a concomitant lowering of the noise floor. We present, here, simulations and experiments that confirm the benefits of injection locking in the CCFG for weak ac target magnetic fields, in line with earlier theoretical predictions.
Item Type: | Conference Item (Paper) | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
Journal or Publication Title: | 2012 IEEE I2MTC - International Instrumentation and Measurement Technology Conference, Proceedings | ||||
Publisher: | IEEE | ||||
Book Title: | 2012 IEEE International Instrumentation and Measurement Technology Conference Proceedings | ||||
Official Date: | 2012 | ||||
Dates: |
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Number: | Article number 6229707 | ||||
Page Range: | pp. 318-322 | ||||
DOI: | 10.1109/I2MTC.2012.6229707 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Conference Paper Type: | Paper | ||||
Title of Event: | 2012 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2012 | ||||
Type of Event: | Conference | ||||
Location of Event: | Graz, Austria | ||||
Date(s) of Event: | 13 - 16 May 2012 |
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