The determination of surface topology by the signal processing of ultrasonic pulses

P. F. Smith*, M. A. Player, D. A.L. Collie

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The authors present results from the processing of data obtained from the reflection of broadbeam ultrasonic pulses from a selection of surfaces. The main aim is to produce height distribution curves of these surfaces. Surfaces tested include specially designed grooved surfaces, a paint layer and a hidden stepped surface. The effects of tilt are also investigated. Two signal processing methods are compared: the maximum entropy method and the Wiener-Hopf filter. It is demonstrated that maximum entropy produces not only more visually pleasing output, but also output that shows very close correspondence with the desired result. Comparison with a conventional stylus instrument is provided, and although resolution capabilities are different, a method of comparison is given. Future aims and problems to be overcome in producing a practical instrument are discussed.

Original languageEnglish
Pages (from-to)397-402
Number of pages6
JournalJournal of Physics E: Scientific Instruments
Volume21
Issue number4
DOIs
Publication statusPublished - Apr 1988

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