A Pulsed Laser/Electromagnetic Acoustic Transducer Approach to Ultrasonic Sensor Needs for Steel Processing

  • G. A. Alers
  • H. N. G. Wadley
Conference paper
Part of the Review of Progress in Quantitative Nondestructive Evaluation book series (RPQN, volume 6 A)


Many of the traditional NDE techniques of the past are today being investigated for their potential role as process control sensors for materials processing [1]. Ultrasonics appears one of the most promising because of its ability to penetrate opaque bodies and allow determination of microstructure variables (such as grain size), process variables (such as internal temperature distribution) and detect internal discontinuities (cracks, pores and inclusions). A key problem with the traditional approaches to ultrasonic measurements is the need to contact the body being probed with piezoelectric transducers. These transducers are fragile, require couplants, and fail when exposed to temperatures of more than a few hundred degrees Celsius. Their use during processing may thus require practices that unacceptably interfere with the process.


Shear Wave Longitudinal Wave Permanent Magnet Ultrasonic Signal Pole Piece 
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Copyright information

© Springer Science+Business Media New York 1987

Authors and Affiliations

  • G. A. Alers
    • 1
  • H. N. G. Wadley
    • 2
  1. 1.Magnasonics, Inc.AlbuquerqueUSA
  2. 2.Metallurgy DivisionNational Bureau of StandardsGaithersburgUSA

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