Polymer film thickness measurement using laser-ultrasound techniques

R. J. Dewhurst, L. Noui, Q. Shan

    Research output: Contribution to journalArticlepeer-review


    The thickness of thin polyester film has been measured using ultrasonic Lamb waves which were generated and detected using noncontacting laser techniques. The uncertainty analysis of such a measurement technique has been examined. Systematic errors in both time of flight and distance between laser generation and detection points were estimated and reduced with the assistance of computerized X-scan translation techniques. Thickness measurements with uncertainties of less than 3% have been achieved.
    Original languageEnglish
    Pages (from-to)1736-1742
    Number of pages6
    JournalReview of Scientific Instruments
    Issue number6
    Publication statusPublished - 1990


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