Acceleration sensor with oppositely-polarized piezoelectric plates
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United States of America Patent
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-
Dec 12, 1995
Issued Date -
N/A
app pub date -
Feb 6, 1995
filing date -
Oct 26, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An acceleration sensor, which is particularly adapted for use in motor vehicles, is improved by structuring it to be readily testable, to assure reliability before installation. The acceleration sensor has a piezo element (1), which consists of at least two piezo-electric plates (2) placed on top of each other, the piezo-electrical polarization of which is oriented in opposite directions. At least two electrodes (9) are placed on each of the topside (7) and the underside (8) of the piezo element (1). For testing the sensor, the piezo element is deformed by the application of an electrical voltage to electrodes (9) of a first lateral portion (11a) of the piezo element. This deformation is detected by means of a deformation-generated voltage at the electrodes (9) of a second lateral portion (11b) of the piezo element.
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