@article{hutchins_coded_nodate,
	title = {Coded waveforms for optimised air-coupled ultrasonic nondestructive evaluation},
	issn = {0041-624X},
	url = {http://www.sciencedirect.com/science/article/pii/S0041624X14000626},
	doi = {10.1016/j.ultras.2014.03.007},
	abstract = {This paper investigates various types of coded waveforms that could be used for air-coupled ultrasound, using a pulse compression approach to signal processing. These are needed because of the low signal-to-noise ratios that are found in many air-coupled ultrasonic nondestructive evaluation measurements, due to the large acoustic mismatch between air and many solid materials. The various waveforms, including both swept-frequency signals and those with binary modulation, are described, and their performance in the presence of noise is compared. It is shown that the optimum choice of modulation signal depends on the bandwidth available and the type of measurement being made.},
	urldate = {2014-04-07TZ},
	journal = {Ultrasonics},
	author = {Hutchins, David and Burrascano, Pietro and Davis, Lee and Laureti, Stefano and Ricci, Marco},
	keywords = {Air-coupled, Coded waveforms, Cross-correlation, Non-Destructive Evaluation, Ultrasonic}
}

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