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

12th International Symposium
on Nondestructive Testing of Wood

Detection of glue deficiency in laminated wood with thermography

Berglind, Henrik
Research Engineer
Trätek - The Swedish Institute for Wood Technology Research
Skeria 2, S-931 77 Skellefteĺ
Dillenz, Alexander
Research Engineer
IKP - Institute for Polymer Testing and Polymer Science
Universitätsbereich Vaihingen, D-70550 Stuttgart
Corresponding Author Contact:
Email: henrik.berglind@tratek.se

Abstract

Introduction

Materials and methods

Fig 3: a) A test piece seen from above with its signal matrix with 55 x 130 pixels, which were used to calculate average values of the signals from each pixel column. b) Signal profile above an area with lack of glue and illustration of the procedure for determination of the contrast between correctly glued areas and areas with glue deficiency.

Results and discussion

Conclusions

Acknowledgements

References

  1. Ahmed, T., J.Feng, Z., Kuo, P. K., Hartakainen, J., and Jaarinen, J., 1987, Characterization of plasma sprayed coatings using thermal wave infrared video imaging, Journal of nondestructive evaluation, 6, 4, p. 169-175
  2. Almond, D. P., and Lau, S. K., 1994, Defect sizing by transient thermography. 1: an analytical treatment, Journal of applied physics, 27, p. 1063-1069
  3. Busse, G. Wu, D., and Karpen, W., 1992, Thermal wave imaging with phase sensitive modulated thermography, Journal of applied physics, 71(8), 15 Apr., p. 3962-3965
  4. Krapez, J. -C., and Balageas, D., 1994, Early detection of thermal contrast in pulsed stimulated thermography, in: QIRT 94 Eurotherm series 42, EETI, Paris, p. 260-266
  5. Lau, S. K., Almond, D. P., and Milne, J. M., 1991, A quantitative analysis of pulsed video thermography, NDT & eval. international, 24, 4, p. 195-202
  6. Maldague, X., Cielo, P., Ashley, P. J., and Farahbakhsh, B., 1987, Thermographic NDT of aluminum laminates, C. S. N. D. T. Journal, July/Aug., p. 44-50
  7. Meinlschmidt, P., Sembach, J., and Hora, G., 1998, Thermografie an Holz und Holzwerkstoffen, Möbeltage in Dresden vom 6.-8. Mai 1998
  8. Reynolds, W. N., and Wells, G. M., 1984, Video-compatible thermography, British journal of NDT, 26, 1, p. 40-44
  9. Sembach, J., Wu, D., Salerno, A., Hora, G., and Busse, G., 1997, Non-destructive evaluation of delaminations in laminated wood-based panels by thermographical inspection tools, Proc. of workshop on nondestructive testing of panel products, 11 October, Llandudno, UK, J. Hague, p. 41-48
  10. Thomas,R. L., Favro, L. D., Kuo, P.K., Ahmed, T., Han, X., Wang, L., Wang, X. and Shepard, S.M., 1995, Pulse-Echo Thermal-Wave Imaging for Non-Destructive Evaluation, in: Proc. 15th International Congress on Acoustics, Trondheim, Norway, June 26-30, p. 433-436
  11. Wu, D., and Busse, G., 1995, Remote inspection of wood with lock-in-thermography, TAPPI 1995 European plastic laminates symposium, Vol 79, N° 8, p. 119-123
  12. Wyss, P., Lüthi, T., Primas R., and Zogmal, O., 1997, Factors affecting the detactability of voids by infrared thermography, in: QIRT 96 - Eurotherm series 50, D. Balageas et al., p. 227-232
  13. Xu, Y., Okumura, S., and Noguchi, M., 1993, Thermographic detection of starved joints of wood, Mukuzai Gakkaishi – Journal of the Japan wood research society, Vol. 39, 5, p. 544-549

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