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All-optical, Three-axis Fiber Laser Magnetometer
Authors: Geoffrey A Cranch; Gary A Miller; Clay K Kirkendall; NAVAL RESEARCH LAB WASHINGTON DC |
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Abstract:
This report describes the development of an undersea fiber-optic magnetometer, suitable for remote deployment as a moving target detection system. A comprehensive overview of the operating principle and performance of this sensor system is given. The magnetic field sensor utilizes the Lorentzian force acting on a current carrying bridge in the presence of a magnetic field, which drives its oscillation measured with a fiber laser strain sensor. The undersea node occupies a footprint of 303 mm x 303 mm and is connected to the opto-electronics unit through an undersea cable 1 km in length. The deployed orientation of the node is measured with an integrated MEMS inclinometer, which is optically powered. The sensor is capable of achieving a magnetic field resolution of 343 pT/Hz(1/2) at 1 Hz for 75 mA (rms) dither current when operated in a moderate vacuum of 1 kPa.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Formal rept. May-Oct 2011 |
| Pages: |
33 |
| Report Date: |
16 Apr 2012 |
| Report Number: |
A148955 |
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Keywords relating to this report:
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