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Proceedings Paper

Source And Reduction Of Inhomogeneous Magnetic Response And Low Frequency Sideband Noise In A Fiber Optic Magnetic Sensor
Author(s): D Dagenais; F. Bucholtz; K P Koo; A Dandridge
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Paper Abstract

Low frequency fiber optic magnetic sensors make use of a magnetic carrier at ω and quadratic magnetostrictive response to upconvert low frequency magnetic signals to be detected. Since the magnetostrictive response is not homogeneous over the transducer length and exhibits hysteresis, one cannot obtain complete nulling of the signal at co, which is typically set at the mechanical resonance of the transducer. This residual signal provides a source of upconversion of low frequency, nonmagnetic noise into the sidebands of the signal at co and, hence, limits the sensitivity of the device. We analyze the sources of the residual signal and determine the critical parameters which define the sensor's minimum detectable field. Experimental data shows how the parameters of the model correlate with the observed residual signal, carrier and sideband signal. We also show how the model parameters vary and change the behavior of the residual signal as one varies the operating regime (dither frequency, dither amplitude, and external dc field) of the transducer.

Paper Details

Date Published: 1 February 1989
PDF: 5 pages
Proc. SPIE 0985, Fiber Optic and Laser Sensors VI, (1 February 1989); doi: 10.1117/12.948840
Show Author Affiliations
D Dagenais, Naval Research Laboratory (United States)
F. Bucholtz, Naval Research Laboratory (United States)
K P Koo, Naval Research Laboratory (United States)
A Dandridge, Naval Research Laboratory (United States)


Published in SPIE Proceedings Vol. 0985:
Fiber Optic and Laser Sensors VI
Ramon P. DePaula; Eric Udd, Editor(s)

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