Relationship between chemical retention and velocity of air-coupled ultrasonic waves in fire-retardant-treated wood

Masumi Hasegawa, Takeshi Kumamoto, Hiroyuki Okamura, Kazutoshi Takeuchi, Ryohei Asakura, Junji Matsumura

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1 Citation (Scopus)


The ultrasonic wave velocities in wood impregnated with a fire-retardant chemical were measured via a non-contact method. An air-coupled ultrasonic wave was made to propagate along the radial direction of the wood. The wave velocities in the wood samples after chemical impregnation were larger than those before impregnation. With increased chemical concentration, the relative changes in the velocities increased to a maximum of 16.3%, and these velocity changes exhibited a strong correlation with the chemical retention. These findings suggest that it is possible to evaluate the uniformity distributions of chemicals in fire-retardant-treated wood via a non-contact and nondestructive method based on air-coupled ultrasonics.

Original languageEnglish
Pages (from-to)3387-3395
Number of pages9
Issue number2
Publication statusPublished - Jan 1 2017


All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Bioengineering
  • Waste Management and Disposal

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