Abstract
For real-time evaluation of non-destructive air-coupled ultrasonic testing of wood-based materials, efficient and reliable calculation methods from ultrasonic holography are essential. Presented here is the spec-radiation method as a fast alternative to the re-radiation method. The spec-radiation method offers a more accurate and up to 88% faster evaluation than the re-radiation method for the determination of flaws in particleboards. Flaws of sub-wavelength sizes can be identified and their shape and location can be determined with this method. The spec-radiation method produces a better reproduction of the sound field than the re-radiation method, especially in the area of the measuring plane.
Highlights
Panel-shaped, wood-based materials are becoming increasingly important in today’s world.Whether it is in the furniture industry, where furniture with processed wood is becoming more common as an approach to sustainability, or in the construction industry, where wood is considered a cost-effective, durable material unlike expensive high-performance materials such as Carbon FiberReinforced Polymer (CFRP) or Glass Fiber Reinforced Polymers (GFRP)
We showed in the analytical derivation that the re-radiation method can be interpreted by its representation with spatial coordinates, but requires a lot of computational effort
A comparison of the two methods showed that the spec-radiation method can be 88% faster in computation than the re-radiation method
Summary
Panel-shaped, wood-based materials are becoming increasingly important in today’s world. Besides the identification of flaws, it is possible to identify objects in a sound field (Tsysar and Sapozhnikov [24], Schmelt et al [25]) This method is based on the Rayleigh–Sommerfeld diffraction integral which has made its way from optics to acoustics. We show that the spec-radiation method delivers good reproductions of the sound field, including the area of the measuring plane We show this through two experiments with flaw imitations in two dimensions.
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