Detection and assessment of wood decay in glulam beams using a through-transmission ultrasonic approach

Adam Senalik; Frank C. Beall; Kristen O'Dell; Henrique Reis

doi:10.1117/12.768001

8 April 2008 Detection and assessment of wood decay in glulam beams using a through-transmission ultrasonic approach

Adam Senalik, Frank C. Beall, Kristen O'Dell, Henrique Reis

Proceedings Volume 6932, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008; 69321W (2008) https://doi.org/10.1117/12.768001
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

Abstract

A glulam beam retired from the field and without visible indications of wood decay was used. Towards detection and assessing wood decay, X-ray computer tomography and ultrasonic measurements were carried out. It was observed that decrease in mass density with increasing levels of wood decay affects x-rays attenuation and allows radioscopy to detect and assess wood decay. Furthermore, it was also observed that the decrease in mass density and stiffness caused by wood decay affects ultrasonics measurements. It was observed that ultrasonic velocity and stress wave features such as time of arrival, area under the power spectral density curve, energy, and frequency of maximum amplitude allows detection and assessment of wood decay. Results show that results from both X-ray computer tomography and ultrasonic measurements are consistent with each other and can be used to detect and assess wood decay in structural lumber.

Citation Download Citation

Adam Senalik, Frank C. Beall, Kristen O'Dell, and Henrique Reis "Detection and assessment of wood decay in glulam beams using a through-transmission ultrasonic approach", Proc. SPIE 6932, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008, 69321W (8 April 2008); https://doi.org/10.1117/12.768001

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