Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2007-04-10
2007-04-10
Dougherty, Thomas M. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S31300R
Reexamination Certificate
active
10492724
ABSTRACT:
A surface acoustic wave (SAW) sensor includes a transducer (240provided on a substrate (23), wherein the transducer (24) is oriented on the substrate (23) so that the direction of acoustic wave propagation is such that the variation of sensor output with temperature, associated with the variation of the substrate third-elastic constants with temperature, substantially equal but opposite to the sum total of the variation of sensor output with temperature associated with the substrate linear temperature coefficient of expansion and with the variations with temperature of the substrate non-zero third order elastic constants, the substrate first-order elastic constants and the substrate density. The effect of temperature variation on sensor output is thereby minimized. This is achieved with a 35-degree arrangement or with reflective gratings inclined at an angle of 3.1 degrees to normal. Additionally, a robust package with a dish is given. Particular applications include the measurement of torque.
REFERENCES:
patent: 3889205 (1975-06-01), Mitchell
patent: 4323809 (1982-04-01), O'Connell
patent: 4325038 (1982-04-01), Coldren
patent: 4434383 (1984-02-01), Cho et al.
patent: 4602182 (1986-07-01), Webster
patent: 4609843 (1986-09-01), Carr et al.
patent: 4661738 (1987-04-01), Skeie
patent: 5585571 (1996-12-01), Londale et al.
patent: 5895996 (1999-04-01), Takagi et al.
patent: WO 01/33180 (2001-05-01), None
Kalinin Victor Alexandrovich
Lee Mark
Dougherty Thomas M.
Keusey, Tutunjian & & Bitetto, P.C.
Transense Technologies PLC
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