Extended accuracy variable capacitance bridge accelerometer

Details Extended accuracy variable capacitance bridge accelerometer Extended accuracy variable capacitance bridge accelerometer

2006-09-19

2006-09-19

Chapman, John E. (Department: 2856)

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

Reexamination Certificate

active

07107845

ABSTRACT:
A bridge accelerometer system includes four capacitors, wherein two capacitors are formed on each side of a rigid member. The other two capacitors are similarly constructed, except that the rigid member is replaced by a flexured plate. The construction of the plates with respect to the flexured plate is substantially similar to the configuration formed by the rigid member and the other two capacitors, and the fixed capacitors and rigid plate are isolated from the flexured arrangement. The four capacitors are connected to form a bridge generating a bridge voltage signal as a function of a sine wave from a symbol generator. The bridge voltage signal is amplified and converted to digital word in an A/D converter. The digital word is linearized and filtered in a microprocessor, which also includes a precision clock controlling the symbol generator and a conversion clock controlling the A/D converter.

REFERENCES:
patent: 6776043 (2004-08-01), Campbell et al.
patent: 6810739 (2004-11-01), Campbell et al.

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