Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1980-08-06
1982-10-19
Ciarlante, Anthony V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 51, 324 96, 350331R, 340784, G01R 3104
Patent
active
043552781
ABSTRACT:
Nondestructive testing and analyzing of surface acoustic wave (SAW) interdigital transducers is accomplished by observing electro-optic changes in a layer of liquid crystals produced by the effects of electric fields resulting from an electrical potential applied to the transducer. A display cell comprising a liquid crystal layer covered with a gold coated glass coverplate is fabricated on the surface of the SAW substrate under test. The assembled display cell is positioned for viewing under a microscope equipped for vertical illumination by a light source and a beam splitter. Polarizers are positioned in the illumination and viewing paths. An electrical potential is applied to the SAW device transducers and in some instances to the coverplate gold coat. Electro-optic effects produced in the liquid crystal by the electric field effects of the applied electrical potential are viewed through the microscope and are analyzed and interpreted.
REFERENCES:
patent: 3934199 (1976-01-01), Channin
IBM Technical Disclosure Bulletin, "Detecting Short Circuits in Multilayer Printed-Circuit Boards", Delarue et al., vol. 21, No. 3, 8/78.
Burns Daniel J.
Sethares James C.
Sweet Gerald G.
Ciarlante Anthony V.
Matthews Willard R.
Singer Donald J.
The United States of America as represented by the Secretary of
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