Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1995-02-06
1995-12-12
Chilcot, Jr., Richard E.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
7351434, 310332, 310359, G01C 1738, G01K 1500, G01P 1508, H02N 104
Patent
active
054739306
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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Shogo Asano et al/Matsushita, "Development of Acceleration Sensor and Acceleration Evaluation System for Super Low Range Frequency" in Sensors & Actuators 1991 (papers from Feb. 1991 International Congress & Exposition) SAE publication P-242, Society of Automotive Engineers, Warrendale, Pa. 15096-0001.
Gademann Lothar
Kippelt Ulrich
Maihoefer Bernd
Ziegenbein Botho
Chilcot Jr. Richard E.
Oen William L.
Robert & Bosch GmbH
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