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Vun, R.Y., Hoover, K., Janowiak, J. and Bhardwaj, M. (2008) Calibration of Non-Contact Ultrasound as an On-Line Sensor for Wood Characterization: Effects of Temperature, Moisture and Scanning Direction. Applied Physics A: Materials Science & Processing, 90, 191-196.
http://dx.doi.org/10.1007/s00339-007-4256-6

has been cited by the following article:

• TITLE: Non-Contact Velocity Measurement of Japanese Cedar Columns Using Air-Coupled Ultrasonics

  AUTHORS: Masumi Hasegawa, Misaki Mori, Junji Matsumura

  KEYWORDS: Air-Coupled Ultrasonics, Velocity, Non-Contact Method, Nodestructive Evaluation, Japanese Cedar

  JOURNAL NAME: World Journal of Engineering and Technology, Vol.4 No.1, February 5, 2016

  ABSTRACT: The ultrasonic wave velocities of Japanese cedar columns were measured using a non-contact method. An air-coupled ultrasonic wave was propagated through the axial and lateral directions of wood. The velocities in the axial direction (VL) showed the minimum values around the pith. The averaged VL increased from 3600 m/s towards the outside of measurement area and attained the maximum values (=4010 m/s). The velocities in the lateral direction (VRT ) showed no tendency among measurement points. The averaged VRT was 1450 m/s. The velocities obtained using the non-contact method showed a significant positive relationship with those obtained using the contact method. The averaged ratio of VL to VRT was measured to be approximately 2.2 to 2.8. These ratios were in agreement with those from a contact method. These findings suggest that it is possible to measure the velocity in Japanese cedar columns with the non-contact method by using air-coupled ultrasonics.