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F.
J. Shih, B. F. Pouet, M. B. Klein, A. D. W. McKie,
2001, “Determination of Glass Thickness Using
Laser-Based Ultrasound,” Review of Progress
in Quantitative Nondestructive Evaluation, 20A,
D. O. Thompson and D. E. Chimenti, eds, 287-92
Determination
of Glass Thickness Using Laser-Based Ultrasound
ABSTRACT
Thickness
measurements of glass plates and glass bottles using
laser-based ultrasound (LBU) are described. Ultrasound
in the glass specimens was generated thermoelastically
with either a pulsed CO2 laser, or a Q-switched
Nd:YAG laser in the case of colored glass filters.
The detection of ultrasound was accomplished by one
of the following methods; a spherical Fabry-Pérot
interferometer system or a photo-refractive interferometer
based on two-wave mixing. A self-interference effect,
utilizing the partial reflection from the front and
back faces of a glass plate was also demonstrated
to have sufficient sensitivity under certain conditions.
The thickness of the glass plates and colored glass
bottles was determined using the fundamental reverberation
frequency obtained from the time-domain waveform data.
LBU results were compared to physical thickness measurements
and showed excellent agreement.
(Article
in PDF, AIP Conference Proceedings)
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