Circuit arrangement for evaluating and testing a capacitive sens

Details Circuit arrangement for evaluating and testing a capacitive sens Circuit arrangement for evaluating and testing a capacitive sens

1992-10-07

1994-10-04

Raevis, Robert

Measuring and testing

Frictional resistance, coefficient or characteristics

Lubricant testing

G01P 1508

Patent

active

053515196

ABSTRACT:
A circuit for evaluating the output of, and for testing, a capacitive sensor, such as those useful for triggering airbags, features two switches (6, 7) for selecting among a test mode and a measurement mode. In the measurement mode, two measuring capacitances (3), formed by a center electrode (1) and a respective one of the two measuring electrodes, are connected to a capacitance bridge (5). In the test mode, one of the measuring capacitances is replaced by a reference capacitance (4), and the replaced measuring capacitance is connected to a voltage source (8).

REFERENCES:
patent: 5148604 (1992-09-01), Bantien
patent: 5153394 (1992-10-01), Abendroth
patent: 5163325 (1992-11-01), White et al.
patent: 5253510 (1993-10-01), Allen et al.
H. Leuthold & F. Rudolf, "An ASIC for High-Resolution Capacitive Microaccelerometers," in Sensors & Actuators, A21-A23, pp. 278-281 (Elsevier Sequoia, Netherlands, 1990).
German Patent Office action of May 22, 1992 re P 41 33 426.4.

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