Accession Number : ADD009900

Title :   Method for Testing and Analyzing Surface Acoustic Wave Interdigital Transducers.

Descriptive Note : Patent,


Personal Author(s) : Burns,Daniel J ; Sethares,James C ; Sweet,Gerald G

Report Date : 19 Oct 1982

Pagination or Media Count : 5

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. Electroplate-optic effects produced in the liquid by the electric field effects of the applied electrical potential are viewed through the microscope and are analyzed and interpreted. (Author)

Descriptors :   *Patents, *Liquid crystals, *Acoustic waves, *Surface waves, *Surface acoustic wave devices, *Electroacoustic transducers, Nondestructive testing, Surface acoustic waves, Display systems, Light sources, Electric fields, Polarizers, Test equipment, Illumination, Electrooptics, Vertical orientation, Analyzers, Gold, Transducers, Layers, Paths, Illumination, Glass, Fabrication, Viewers, Voltage, Beam splitting

Subject Categories : Line, Surface and Bulk Acoustic Wave Devices
      Electrooptical and Optoelectronic Devices
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE