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The majority of commercial MEMS gyroscopes are operated in a mode-split condition where the drive and sense modes are intentionally mismatched in frequency, thus prioritizing gain stability and allowing for wide bandwidth but often sacrificing the noise density. In mode-matched operation, the gyroscope gain depends on sense-mode Q-factor, which improves the noise and scale-factor of MEMS gyroscopes...
We report a system for simultaneous rate readout and drift cancellation for MEMS vibratory gyroscopes without significantly affecting the sensor noise or bandwidth. The drift cancellation is accomplished by periodically reversing polarity of the gyroscope's forcing voltage. As opposed to the state-of-the-art methods, our self-calibration does not interrupt normal gyroscope operation nor require a...
We present a method for improving bias instability and Rate Random Walk (RRW) in low-cost MEMS vibratory gyroscopes by periodically reversing polarity of the resonator drive force, yielding a 5 times reduction of RRW noise. The feasibility of the approach was experimentally evaluated using an in-production Analog Devices ADXRS800, a fully integrated MEMS gyroscope with a quadruple mass architecture...
Samples collected in December 1990 and July 1991 show that dissolved Cd, Cu, Ni, and Zn distributions in the Gulf of the Farallones are dominated by mixing of two end-members: (1) metal-enriched San Francisco Bay water and (2) offshore California Current water. The range of dissolved metal concentrations observed is 0.2–0.9 nmol kg−1 for Cd, 1–20 nmol kg−1 for Cu, 4–16 nmol kg−1 for Ni, and 0.2–20...
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