Closed-Loop Fiber-Optic Magnetometer/Gradiometer

C. M. Dube; S. Thordarson; K. H. Wanser

doi:10.1117/12.942485

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23 March 1988 Closed-Loop Fiber-Optic Magnetometer/Gradiometer

C. M. Dube, S. Thordarson, K. H. Wanser

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Proceedings Volume 0838, Fiber Optic and Laser Sensors V; (1988) https://doi.org/10.1117/12.942485
Event: Cambridge Symposium on Fiber Optics and Integrated Optoelectronics, 1987, Cambridge, MA, United States

Abstract

A closed-loop, fiber-optic magnetometer/gradiometer, utilizing digital signal proces-sing, has been designed, built and tested. Several novel features of this gradiometer are discussed. In particular, the device is simultaneously a magnetometer and gradiometer. The sensor employs metallic glass transducers in a fiber-optic Mach-Zehnder interferometer. A unique signal processing method utilizing magnetic feedback nulling allows for a stable gradiometer and minimal sensor hysteresis. Directional response of the magnetometer and gradiometer, as well as stability of the combined configuration are presented. Currently, the sensor is being characterized in the laboratory. Preliminary results indicate sub-gamma field sensitivity, and results from a packaged sensor are presented.

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C. M. Dube, S. Thordarson, and K. H. Wanser "Closed-Loop Fiber-Optic Magnetometer/Gradiometer", Proc. SPIE 0838, Fiber Optic and Laser Sensors V, (23 March 1988); https://doi.org/10.1117/12.942485

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