NONDESTRUCTIVE EVALUATION OF WOOD USING ULTRASONIC TECHNIQUE

Nondestructive Evaluation: Wood

Preservationists look to methods of nondestructive evaluation (NDE) to answer questions about the condition, strength, and construction details of wood in historic buildings in the interest of saving historic fabric and reducing or eliminating damage to significant historic features or materials caused by investigative probes. Many times, a basic wood inspection can answer questions posed when ...

Deconvolution of ultrasonic nondestructive evaluation signals using higher-order statistics

In ultrasonic nondestructive evaluation (NDE) of materials, pulse echo measurements are masked by the characteristics of the measuring instruments, the propagation paths taken by the ultrasonic pulses, and are corrupted by additive noise. Deconvolution operation seeks to undo these masking effects and extract the defect impulse response which is essential for identification. In this contributio...

Nondestructive Evaluation of Defects in Wood Pallet Parts by Ultrasonic Scanning

Ultrasonic scanning experiments were conducted for detecting defects in wood pallet parts using rolling transducers. The characterization of defects is important for sorting and grading pallet parts, as well as for manufacturing quality and durable pallets. This paper reports the scanning results for stringers and deckboards – the two main components of pallet for red oak and yellow-poplar spec...

Air-Coupled Nondestructive Evaluation Using Micromachined Ultrasonic Transducers

Nondestructive evaluation techniques Amlrurn , which use conventional piezoelectric transducers tvDicallv reauire liquid coupling fluids to improve " _ . the impedance mismatch between piezoelectric materials and air. Air-coupled ultrasonic systems can eliminate this requirement if the dynamic range of the system is large enough such that the losses a t the air-solid interfaces are tolerable. C...

Ultrasonic Signal Processing Platform for Nondestructive Evaluation