Demonstration of a fiber optic array of three-axis magnetometers for undersea application

Bucholtz, F.; Dagenais, D.M.; Villarruel, C. A.; Kirkendall, Clay K.; McVicker, J. A.; Davis, Allen; Patrick, S.S.; Koo, K.P.; Wang, G.; Valo, H.; Eidem, Ellen Johanne; Andersen, A.; Lund, T.; Gjessing, R.; Knudsen, Tor

doi:10.1109/20.490325

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…The dynamic deflection of the beam can be calculated from the Euler equation for beams, by assuming simple harmonic motion for the driving force such that F = ηω 2 y, where η is the mass per unit length and ω is the excitation frequency. This yields [18] d 4…”

Section: Static and Dynamic Deflection Properties Of The Beammentioning

confidence: 95%

“…where the constant β 1 determined from the boundary conditions is β 1 = (16/3)π 4 for the first resonance of a beam fixed at each end [18].…”

Section: Static and Dynamic Deflection Properties Of The Beammentioning

confidence: 99%

“…Passive target detection by acoustic signature measurement forms the basis of many sonar systems. However, detection of targets by other associated signatures such as electric or magnetic field is also possible [4]. This can be particularly advantageous in areas of high acoustic reverberation and noise where acoustic detection ranges are limited.…”

Section: Introductionmentioning

confidence: 99%

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High-resolution distributed-feedback fiber laser dc magnetometer based on the Lorentzian force

Cranch¹,

Flockhart²,

Kirkendall

2009

Meas. Sci. Technol.

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A low-frequency magnetic field sensor, based on a current-carrying beam driven by the Lorentzian force, is described. The amplitude of the oscillation is measured by a distributed-feedback fiber laser strain sensor attached to the beam. The transduction mechanism of the sensor is derived analytically using conventional beam theory, which is shown to accurately predict the responsivity of a prototype sensor. Excellent linearity and negligible hysteresis are demonstrated. Noise sources in the fiber laser strain sensor are described and thermo-mechanical noise in the transducer is estimated. The prototype sensor achieves a magnetic field resolution of 5 nT Hz for 25 mA of current, which is shown to be close to the predicted thermo-mechanical noise limit of the sensor. The current is supplied optically through a separate optical fiber yielding an electrically passive sensor head.

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Section: Static and Dynamic Deflection Properties Of The Beammentioning

confidence: 95%

“…where the constant β 1 determined from the boundary conditions is β 1 = (16/3)π 4 for the first resonance of a beam fixed at each end [18].…”

Section: Static and Dynamic Deflection Properties Of The Beammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High-resolution distributed-feedback fiber laser dc magnetometer based on the Lorentzian force

Cranch¹,

Flockhart²,

Kirkendall

2009

Meas. Sci. Technol.

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Measurement of Magnetic Fields

Fiorillo

2004

Characterization and Measurement of Magnetic Materials

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Characterization of a high mechanical-Q fiber laser Lorentz force dc magnetometer

Cranch

Askins

Miller

et al. 2011

Review of Scientific Instruments

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A magnetic field sensor is described based on coupling the field into a time varying strain in a fiber laser strain sensor, through the Lorentzian force. A conducting bridge carries an ac current and oscillates at resonance in the presence of a magnetic field. A fiber laser strain sensor attached to the ribbon measures the deflections. The quality factor is shown to be limited by air damping resulting in a measurement resolution of 704 \documentclass[12pt]{minimal}\begin{document}$\text{pT/Hz}^{1/2} \pm 10 \%$\end{document}pT/Hz1/2±10% at ambient pressure and 360 \documentclass[12pt]{minimal}\begin{document}$\text{pT}/\text{Hz}^{1/2} \pm 10 \%$\end{document}pT/Hz1/2±10% at a reduced pressure of 1700 Pa at 1 Hz and 75 mA (rms).

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Demonstration of a fiber optic array of three-axis magnetometers for undersea application

Cited by 5 publications

References 3 publications

High-resolution distributed-feedback fiber laser dc magnetometer based on the Lorentzian force

High-resolution distributed-feedback fiber laser dc magnetometer based on the Lorentzian force

Measurement of Magnetic Fields

Characterization of a high mechanical-Q fiber laser Lorentz force dc magnetometer

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