Common Mode Rejection Considerations For Mach-Zehnder Fiber Optic Magnetic Gradiometer

R. D. Rempt

doi:10.1117/12.963035

13 February 1990 Common Mode Rejection Considerations For Mach-Zehnder Fiber Optic Magnetic Gradiometer

R. D. Rempt

Proceedings Volume 1169, Fiber Optic and Laser Sensors VII; (1990) https://doi.org/10.1117/12.963035
Event: OE/FIBERS '89, 1989, Boston, United States

Abstract

A Mach-Zehnder interferometer configured as a magnetic gradiometer common mode rejects the field. The nonlinear effect coupling the transducer in each arm of the interferometer results in a sensor output that contains signals proportional to both the field and the gradient if the sensor is slightly out of balance. This field signal can swamp the gradient unless care is taken to eliminate it. Analytically modelled data are presented showing this effect, and it's estimate of the "purity" of the gradient signal. To operate the gradiometer unambiguously, the field must be rejected by >60 dB.

Citation Download Citation

R. D. Rempt "Common Mode Rejection Considerations For Mach-Zehnder Fiber Optic Magnetic Gradiometer", Proc. SPIE 1169, Fiber Optic and Laser Sensors VII, (13 February 1990); https://doi.org/10.1117/12.963035

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