Source And Reduction Of Inhomogeneous Magnetic Response And Low Frequency Sideband Noise In A Fiber Optic Magnetic Sensor

D Dagenais; F. Bucholtz; K P Koo; A Dandridge

doi:10.1117/12.948840

1 February 1989 Source And Reduction Of Inhomogeneous Magnetic Response And Low Frequency Sideband Noise In A Fiber Optic Magnetic Sensor

D Dagenais, F. Bucholtz, K P Koo, A Dandridge

Author Affiliations +

Proceedings Volume 0985, Fiber Optic and Laser Sensors VI; (1989) https://doi.org/10.1117/12.948840
Event: O-E/Fiber LASE '88, 1988, Boston, MA, United States

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.

Citation Download Citation

D Dagenais, F. Bucholtz, K P Koo, and A Dandridge "Source And Reduction Of Inhomogeneous Magnetic Response And Low Frequency Sideband Noise In A Fiber Optic Magnetic Sensor", Proc. SPIE 0985, Fiber Optic and Laser Sensors VI, (1 February 1989); https://doi.org/10.1117/12.948840

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