Lead iron tungstate capacitive transducer, relaxor material therefor and method of manufacture of said relaxor material
First Claim
1. A lead iron tungstate capacitive pressure transducer comprising a lead iron tungstate disc having a polished smooth first flat surface, a polished smooth second flat surface, the said polished smooth first flat surface being completely coated with metal electrode, the polished smooth second flat surface also being coated with metal electrode, the said metal electrode on polished smooth second flat surface comprising formed coated circular portions comprising a central portion and a coated annular concentric portion separated from the central portion by an annular concentric clear region, conducting metal wires being fixed to the metal electrode on polished smooth first flat surface, metal electrode on coated central portion of polished smooth second flat surface and metal electrode on coated annular concentric portion of polished smooth second flat surface.
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Abstract
The present invention discloses a relaxor material lead iron tungstate which has been synthesized in doped and undoped conditions by single and two step heat treatment. The relaxor material is seen to exhibit almost negligible hysteresis and a transducer made thereby shows pressure measurement capability over a wide range from 0.5 MPa to 415 MPa with accuracy of ±0.05%.
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13 Claims
- 1. A lead iron tungstate capacitive pressure transducer comprising a lead iron tungstate disc having a polished smooth first flat surface, a polished smooth second flat surface, the said polished smooth first flat surface being completely coated with metal electrode, the polished smooth second flat surface also being coated with metal electrode, the said metal electrode on polished smooth second flat surface comprising formed coated circular portions comprising a central portion and a coated annular concentric portion separated from the central portion by an annular concentric clear region, conducting metal wires being fixed to the metal electrode on polished smooth first flat surface, metal electrode on coated central portion of polished smooth second flat surface and metal electrode on coated annular concentric portion of polished smooth second flat surface.
Specification