EMAT Generation and Laser Detection of Single Lamb Wave Modes
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
Non-contact and couplant-free nondestructive testing methods are desired in certain situations. There are several designs of non-contact transducers that have been developed. Electromagnetic acoustic transducers (EMATs) and laser-based ultrasonic sensors are well known non-contact transducers. EMATs are typically of limited bandwidth. EMATs and LBU both have lower sensitivity than conventional piezoelectric transducers, and are therefore typically useful in situations where there is sufficient signal strength, but where non-contact is necessary (EMATs and LBU), or where high spatial resolution (LBU) is needed. Thus, ultrasonic NDE schemes with various configurations have been utilized; these configurations include using EMATs as both generator and receiver [1–2], using lasers as both generator and receiver[3–4], and using a laser as source and EMATs as receiver .