Crawling spot thermal nondestructive testing (NDT) for plaster inspection and comparison with dynamic thermography with extended heating

Paolo G. Bison, Alberto Braggiotti, Chiara Bressan, Ermanno G. Grinzato, S. Marinetti, Andrea Mazzoldi, Vladimir Vavilov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Defects in building materials located parallel to the front surface, like plaster detachment, or perpendicularly, such as cracks, are detected creating a space-varying heat flux. A variant of the `flying spot' technique called `crawling spot' was developed in order to fit requirements of these materials. This nondestructive method is performed with a localized radiant heating of the surface and synchronized local temperature measurement in the IR band. The identification of delaminations and cracks was theoretically and experimentally studied using two different procedures. Results obtained for plaster detachments were compared with dynamic thermography, applied with an extended excitation of the surface and analysis of the normalized thermal contrast both in amplitude and time. Another technique requires a continuously moving spot to heat the surface while a sequence of thermograms is recorded. The temperature profile of each pixel has to be reconstructed according to the spot speed and trajectory. This procedure was applied to stone crack detection. The experimental apparatus is thoroughly described.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsSharon A. Semanovich
Pages53-63
Number of pages11
Volume2473
Publication statusPublished - 1995
EventThermosense XVII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications - Orlando, FL, USA
Duration: 19 Apr 199521 Apr 1995

Other

OtherThermosense XVII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications
CityOrlando, FL, USA
Period19.4.9521.4.95

Fingerprint

plasters
Plaster
Nondestructive examination
inspection
Inspection
Heating
heating
cracks
detachment
Radiant heating
radiant heating
Cracks
Crack detection
thermograms
Delamination
Temperature measurement
temperature profiles
temperature measurement
Heat flux
heat flux

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Bison, P. G., Braggiotti, A., Bressan, C., Grinzato, E. G., Marinetti, S., Mazzoldi, A., & Vavilov, V. (1995). Crawling spot thermal nondestructive testing (NDT) for plaster inspection and comparison with dynamic thermography with extended heating. In S. A. Semanovich (Ed.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 2473, pp. 53-63)

Crawling spot thermal nondestructive testing (NDT) for plaster inspection and comparison with dynamic thermography with extended heating. / Bison, Paolo G.; Braggiotti, Alberto; Bressan, Chiara; Grinzato, Ermanno G.; Marinetti, S.; Mazzoldi, Andrea; Vavilov, Vladimir.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / Sharon A. Semanovich. Vol. 2473 1995. p. 53-63.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Bison, PG, Braggiotti, A, Bressan, C, Grinzato, EG, Marinetti, S, Mazzoldi, A & Vavilov, V 1995, Crawling spot thermal nondestructive testing (NDT) for plaster inspection and comparison with dynamic thermography with extended heating. in SA Semanovich (ed.), Proceedings of SPIE - The International Society for Optical Engineering. vol. 2473, pp. 53-63, Thermosense XVII: An International Conference on Thermal Sensing and Imaging Diagnostic Applications, Orlando, FL, USA, 19.4.95.
Bison PG, Braggiotti A, Bressan C, Grinzato EG, Marinetti S, Mazzoldi A et al. Crawling spot thermal nondestructive testing (NDT) for plaster inspection and comparison with dynamic thermography with extended heating. In Semanovich SA, editor, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 2473. 1995. p. 53-63
Bison, Paolo G. ; Braggiotti, Alberto ; Bressan, Chiara ; Grinzato, Ermanno G. ; Marinetti, S. ; Mazzoldi, Andrea ; Vavilov, Vladimir. / Crawling spot thermal nondestructive testing (NDT) for plaster inspection and comparison with dynamic thermography with extended heating. Proceedings of SPIE - The International Society for Optical Engineering. editor / Sharon A. Semanovich. Vol. 2473 1995. pp. 53-63
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