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- Title
Defect Detection in Solid Timber Panels Using Air-Coupled Ultrasonic Imaging Techniques.
- Authors
Jiang, Xiaochuan; Wang, Jun; Zhang, Ying; Jiang, Shenxue
- Abstract
This paper reports on investigations of the air-coupled ultrasonic (ACU) method to detect common defects in solid timber panels made of Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.). The ACU technology is a non-contact method for nondestructive timber testing with quicker scanning rates compared to contact methods. A testbed was set up consisting of commercially available piezo-ceramic ACU transducers and in-house manufactured signal processing circuits. To demonstrate the suitability of the ACU technique, through-transmission measurement results are presented for samples with defects such as knots, wormholes, and cracks. Pulse compression methods (Barker-coded method) were used to improve the power of received signals based on cross-correction algorithms. Results showed defects of timber panels made of Chinese fir can be detected with a thickness of less than 40 mm. Defects larger than 3 mm in diameter could be detected with high precision. Applying the pulse compression method showed better results than using common sine signals as excitation signals since it increased the signal-to-noise ratio, which is especially important for air-coupled measurement of high-attenuation materials like timber materials. The measurement results on reference samples demonstrated that ACU technology is a promising method for timber defect detection, especially for the quality assessment of engineered wood products.
- Subjects
ULTRASONIC imaging; CHINA fir; TIMBER; ENGINEERED wood; WOOD products; NONDESTRUCTIVE testing
- Publication
Applied Sciences (2076-3417), 2024, Vol 14, Issue 1, p434
- ISSN
2076-3417
- Publication type
Article
- DOI
10.3390/app14010434