Device for measuring a force with the aid of a capacitative sens

Details Device for measuring a force with the aid of a capacitative sens Device for measuring a force with the aid of a capacitative sens

1996-12-26

1998-10-13

Oda, Christine K.

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

7351418, G01P 15125

Patent

active

058214216

ABSTRACT:
There is described a device for delivering an output signal representative of a force by means of a capacitative sensor (1) and of an interface (5, 7, 9A, 12) for transferring charge accumulated on the capacitor (C.sub.1 and C.sub.2) of the sensor. In order to reduce the influences of the stray resistances impairing the operation of the sensor (1), the capacitors of the latter are precharged during a first operating phase, whereas during a second operating phase this charge is transferred, while the two capacitors of the sensor (1) are short-circuited and brought to the output potential of the interface.

REFERENCES:
patent: 3877313 (1975-04-01), Ferriss
patent: 4584885 (1986-04-01), Cadwell
patent: 5440939 (1995-08-01), Barny
"An ASIC for High-resolution Capacitive Microaccelerometers", H. Leuthld R. Rudolf, Sensors and Actuators, vol. A21-A23 (1990), pp. 278-281 (no month).

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