NDT.net - March 2001, Vol. 6 No. 03

12th International Symposium
on Nondestructive Testing of Wood

Acoustic emission study of within-ring internal checking in radiata pine-Wood NDT 2000

Booker, Rudolf, Haslett, Tony N
Scientist, Forest Research Institute Ltd.
Rotorua, New Zealand
Sole, John A

Corresponding Author Contact:
Email: Rolf.Booker@forestresearch.co.nz



Fig 1:Profiled product machined from a radiata pine board containing within-ring internal checking. Removing the surfaces has exposed the checks that were originally hidden.

Materials and methods

Fig 2: Diagram showing the way the boards were sectioned. The arrows indicate the surfaces on which the checks were counted. Fig 3: The acoustic emission transducers with pins to hold them to the wood surface

Results and Discussion

Fig 7: Acoustic emission rate versus time (seconds) for board 1. Fig 8: Acoustic emission rate versus time (seconds) for board 2.



  1. Booker R.E., 1994. Collapse or internal checking-which comes first? Proceedings 4 th IUFRO Wood Drying Conference, 9-13 August 1994, Rotorua, New Zealand, p 133-140.
  2. McConchie D. 1999. Update on within-ring internal checking, including a procedure to identify logs prone to form checks during drying. In: 3rd Wood Quality Symposium, Emerging technologies for evaluating wood quality for wood processing, Forest Engineering Association, Rotorua, 30/11/1999.
  3. Miller W. and Simpson I., 1992. Collapse associated internal checking in radiata pine. Proceedings IUFRO Wood Drying Conference, Vienna, Austria, 18-23 August 1992.
  4. Tiemann H.D. 1913. Eucalyptus Lumber. Hardwood Record, Chicago, Sept 25 and Oct 10.
  5. Tiemann H.D. 1915. Principles of kiln drying. Lumber World Review, Jan 15 and Sept 25.

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