A Hybrid Laser Ultrasonic Based System for Composite Molding

  • S. K. Sahay
  • R. A. Kline
Chapter

Abstract

Conventional piezoelectric based ultrasonic systems have been extensively employed for material characterization. These systems however, have been challenged by the recent need to rapidly scan large areas of new materials such as composites having complex geometry. A promising candidate addressing this issue is laser ultrasonics. Though laser ultrasonics is not new and has generated considerable research interest in the past two decades, its industrial acceptance has been limited. Among its many benefits, laser ultrasonics promise the flexibility of a couplant free inspection system. Pulsed lasers, in particular, offer energy concentration at high repetition rates which can be readily directed at any location on the specimen for interrogation purposes. The detection of laser ultrasound is usually done through Michaelson or Fabry-Perot type interferometric systems. Though these detection systems have the advantage of couplant free detection, they constitute a major component of system cost owing to the precision required. The sensitivity of such systems are also not satisfactory.

Keywords

Porosity Mold Glycol Expense Production Line 

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Copyright information

© Plenum Press, New York 1995

Authors and Affiliations

  • S. K. Sahay
    • 1
  • R. A. Kline
    • 1
  1. 1.School of Aerospace and Mechanical EngineeringUniversity of OklahomaNormanUSA

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