Accelerometer incorporating a driven shield

Details Accelerometer incorporating a driven shield Accelerometer incorporating a driven shield

1993-02-03

1994-09-20

Woodiel, Donald

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

29 2541, 73518, 361280, G01P 15125

Patent

active

053478673

ABSTRACT:
An accelerometer implementing a capacitive transducer, including circuitry for reducing the effective loading capacitance on a movable vane. The capacitive transducer includes a pair of shields, including an inner shield driven by the output of a unity gain amplifier which is coupled to the movable vane, and a second outer grounded shield isolated from and encompassing both the driven shield and the capacitive transducer. Thus, the accelerometer reduces both the effective parasitic loading capacitance by taking advantage of the well-known Miller theorem, while implementing a second grounded shield without affecting the parasitic loading capacitance to reduce EMI. A more linear capacitive based accelerometer is realized which can be practically implemented in vehicles, including vehicle performance analyzers used in automobiles for detecting changes in G-forces experienced during acceleration and deceleration of the vehicle.

REFERENCES:
patent: 4435737 (1984-03-01), Colton
patent: 4694687 (1987-09-01), Bonin et al.
patent: 5205171 (1993-04-01), O'Brien et al.
patent: 5216490 (1993-06-01), Greiff et al.

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