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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 22, Iss. 12 — Jun. 15, 1983
  • pp: 1875–1878

Ultrasonic measurements in fine powders using a photoacoustic pulse-generation technique

Wayne Imaino and Andrew C. Tam  »View Author Affiliations


Applied Optics, Vol. 22, Issue 12, pp. 1875-1878 (1983)
http://dx.doi.org/10.1364/AO.22.001875


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Abstract

In this paper, we demonstrate the applicability of PA pulse generation for the monitoring of ultrasonic properties of powders, for example, uncured carbon-loaded epoxy resin powders, whose average particle diameter is ~15 μm. The acoustic pulse is generated by a short laser pulse (10-nsec or 1-μsec duration) of 1–10-mJ energy and is detected by a piezoelectric detector (polyvinylidene difluoride foil or commercial lead zirconate titanate transducer). This allows ultrasonic measurements over a broad range of porosity and pressure conditions, from loose unconsolidated powers to heat- and pressure-sintered pellets. For loose powders at atmospheric pressures (with a porosity of ~50%), the acoustic velocity is remarkably small (typically 3 × 103 cm/sec), and attenuation and dispersion are large. This appears to be the first demonstration of the use of a PA technique to measure ultrasonic properties in powders.

© 1983 Optical Society of America

History
Original Manuscript: January 13, 1983
Published: June 15, 1983

Citation
Wayne Imaino and Andrew C. Tam, "Ultrasonic measurements in fine powders using a photoacoustic pulse-generation technique," Appl. Opt. 22, 1875-1878 (1983)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-22-12-1875

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