13 February 1990 Common Mode Rejection Considerations For Mach-Zehnder Fiber Optic Magnetic Gradiometer
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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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
R. D. Rempt, 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); doi: 10.1117/12.963035; https://doi.org/10.1117/12.963035
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