Coded waveforms for optimised air-coupled ultrasonic nondestructive evaluation

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...

Review of Air-Coupled Transduction for nondestructive Testing and evaluation

Introduction Nondestructive testing (NDT) of structures and mechanical parts is increasingly receiving attention as the need to monitor the health of aging infrastructure and quality controls on the manufacturing of mechanical parts is becoming more apparent. NDT is defined as using various tools, whether they be acoustic, electromagnetic, or thermally based, to inspect the structural integrity...

Ultrasonic Signal Processing Platform for Nondestructive Evaluation

Micromachined ultrasonic transducers for air-coupled non-destructive evaluation

ABSTRACT Conventional methods of ultrasonic non-destructive evaluation (NDF.) use liquids to couple sound waves into the test sample. This either requires immersion of the parts to he examined or the use of complex and bulky water squirting systems that must be scanned over the structure. Air-coupled ultrasonic systems eliminate these requirements if the losses at air-solid interfaces are toler...

Glue Line Nondestructive Assessment in Timber Laminates with an Air-Coupled Ultrasonic Technique

19.