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Active Thermography Inspection of Surface-whitened Mortars – Measurement of Surface Spectral Absorptivity for Investigation of Efficient Heating Light Wavelengths

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Abstract

The surface spectral absorptivity of surface-whitened mortars due to the occurrence of efflorescence (i.e., mortars whose surface was covered with calcium carbonate) was measured, and the relationship between the spectral absorptivity and inspection capability of active thermography inspection was investigated. The spectral absorptivity of mortars increased significantly at a wavelength of approximately 3000 nm regardless of the presence/absence of the discoloration. Experiments for mortar specimens using optical lights with wavelengths in the visible, short wavelength, and medium/long wavelength ranges showed that the heating efficiency and defect detection capability of active thermography inspection were correlated with the surface spectral absorptivity, and were higher when long wavelength light was used as a heater. Defects in the surface-whitened mortar specimen were detected more efficiently when the specimen was heated using a CO2 laser, whose wavelength is in the long wavelength range, than when using an optical light having a wavelength in the visible/short wavelength range.

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The surface absorptivity of the specimens in the medium/long wavelength range was measured at Tokyo Metropolitan Industrial Technology Research Institute.

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Authors and Affiliations

  1. Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima, Tokushima, 770-8506, Japan

    Masashi Ishikawa, Yoshihiro Suto & Hideo Nishino

  2. Institute of Post-LED Photonics, Tokushima University, 2-1 Minamijosanjhma, Tokushima, 770- 8506, Japan

    Akira Emoto

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  1. Masashi Ishikawa
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  4. Hideo Nishino
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Contributions

Masashi Ishikawa conceptualized the study, conducted the experiments, and wrote the main manuscript text, Akira Emoto designed the experiments and interpreted the results, Yoshihiro Suto conducted experiments and prepared figures, and Hideo Nishino supervised and evaluated the results. All authors reviewed the manuscript.

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Correspondence to Masashi Ishikawa.

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Ishikawa, M., Emoto, A., Suto, Y. et al. Active Thermography Inspection of Surface-whitened Mortars – Measurement of Surface Spectral Absorptivity for Investigation of Efficient Heating Light Wavelengths. J Nondestruct Eval 43, 7 (2024). https://doi.org/10.1007/s10921-023-01026-9

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