Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1993-04-27
1995-07-04
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310318, 310332, 310351, 310352, 73517AV, H01L 4108
Patent
active
054303427
ABSTRACT:
An angular rate sensor system [10] comprising a vibratory sensing element [12] and signal processing circuit [14]. The element [12] is preferably a polymorphic rectangular bar fabricated from two layers of piezoceramic material [26, 28] divided by a thin center electrode [E.sub.c ], and a plurality of electrodes [E.sub.1 -E.sub.4 ] scored onto the planar conductive surfaces [30, 32]. The element [12] is suspended at its acoustic nodes [N, N'] to vibrate in one direction [V] normal to the physical plane of the electrodes [E.sub.c, E.sub.1 -E.sub.4 ] using any suitable mounting structure such as parallel crossed filaments [34] or inwardly angled support arms [64] that provide predetermined degrees of lateral [S'] and longitudinal [S] stiffness. The circuit [14] may optionally constitute totally shared [FIG. 7], partially shared [FIG. 8], or totally isolated [FIG. 9] driving and sensing functions, the corresponding element [12] being configured with dual-pair, single-pair, or single-triple outer electrodes [E.sub.1 -E.sub.4 ], respectively. The circuit [14] typically utilizes an automatic gain control and two operational amplifiers, and may include various signal conditioning components and a separate tuning module.
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Dougherty Thomas M.
Watson Industries Inc.
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