Development of a Sensitive Superconducting Gravity Gradiometer for Geological and Navigational Applications
Nat. Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986 - 217 pages
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4a Transducer coupled to a SQUID through a transformer
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acceleration error acceleration noise acceleration signal acceleration transducers accelerometer mode angular acceleration angular motion angular velocity axis baseline Brownian motion Brownian motion noise calibration centrifugal acceleration common acceleration common mode balance component accelerometers coupling defined dewar differential acceleration displacement effect electromagnetic error coefficients error sources filter finite fluctuations flux quantization Fourier transform gradio gradiometer assembly gradiometer mode gradiometer output gravity gradient signal H.A. Chan H.J. Paik heat-switch horizontal acceleration inductance inductor inertial instrument inverse square law low frequency noise low-pass filter M.V. Moody magnetic measured meter misalignment modulation Nb wires noise spectrum obtained pancake coils Paper parameters pendulum pendulum action persistent currents platform proof mass resonance frequency Section sensing coils sensitive axes shield spectral density spring constant SQUID SQUID amplifier stored current superconducting circuit superconducting gradiometer superconducting gravity gradiometer superconducting loops tensor term in Eq thermal transducer transfer function tubing vector vertical vibration isolation