S.A.W. co-ordinate sensor

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S.A.W. co-ordinate sensor

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The co-ordinates of the tip of a pencil lightly pressed on a piezoelectric crystal are deduced from measurements of the time necessary for surface acoustic waves (s.a.w.) to propagate from interdigital transducers to the pencil. Graphs drawn by the pencil moving on the crystal can be stored in a computer at a fast rate. Examples of data acquisition are given.

Inspec keywords: acoustic surface wave devices; computer graphic equipment; interactive terminals

Other keywords: piezoelectric crystal; data acquisition; interactive graphics; interdigital transducers; SAW coordinate detector

Subjects: Acoustic wave devices; Terminals and graphic displays


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