Characterization of a high mechanical-Q fiber laser Lorentz force dc magnetometer |
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Authors: | Cranch G A Askins C G Miller G A Kirkendall C K |
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Affiliation: | Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375, USA. geoff.cranch@nrl.navy.mil |
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Abstract: | 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 pT/Hz(1/2)±10% at ambient pressure and 360 pT/Hz(1/2)±10% at a reduced pressure of 1700 Pa at 1 Hz and 75 mA (rms). |
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