发明名称 |
Electronics for coriolis force and other sensors |
摘要 |
Electronics for use in Coriolis and other sensors for reducing errors in the sensor output signal. An off-frequency drive scheme includes a frequency translation circuit in the excitation feedback loop of a sensor system to suppress components of the sensor drive signal at a predetermined frequency so that coupling of the drive signal to the sensor output signal can be readily removed by conventional filtering techniques. An amplifier circuit having a bandpass circuit in cascade with the forward loop gain is provided, with the bandpass circuit having a transfer function approximating one plus a bandpass characteristic, the passband of which corresponds to the information band. This arrangement increases the open-loop gain of the amplifier circuit around the information frequency without affecting the open-loop gain at DC and crossover so as to reduce phase and gain errors around the information frequency. A quadrature nulling system is provided for an in-plane micromechanical gyroscope. A signal having an in-phase component due to Coriolis induced out-of-plane motion and a quadrature component due to mechanical misalignments is mixed with a voltage in-phase with motor position. The mixer output is used to apply a DC potential to motor drive electrodes and is automatically adjusted by the integral compensator until the mixer output is zero, resulting in a nulled quadrature component.
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申请公布号 |
US5600064(A) |
申请公布日期 |
1997.02.04 |
申请号 |
US19950448789 |
申请日期 |
1995.05.24 |
申请人 |
THE CHARLES STARK DRAPER LABORATORY, INC. |
发明人 |
WARD, PAUL |
分类号 |
G01C19/56;G01P9/04;H03F1/08;(IPC1-7):G01P9/00 |
主分类号 |
G01C19/56 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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