Photoacoustic Evaluation of Green State Alumina Samples

  • Markku Oksanen
  • Mauri Luukkala
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series


Material characterization and testing of construction ceramics without destruction of the sample is needed to ensure the quality of ceramic products. In the most demanding applications testing of every product would be needed, therefore we are seeking a method which would be both fast and reliable. We have tested a method to characterize the defects in green state alumina where the process is based on the generation of ultrasonic waves by a focused pulse laser. The generated nanosecond scale pulse is used to measure the transit time between the generation volume and the ultrasonic detector and the time is used to calculate the relative density change.


Transit Time Sound Velocity Acoustic Pulse Ultrasonic Transducer Ultrasonic Detector 
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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • Markku Oksanen
    • 1
  • Mauri Luukkala
    • 1
  1. 1.Department of PhysicsUniversity of HelsinkiHelsinkiFinland

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