title: Air-coupled ultrasonic spectroscopy of highly damping materials using pulse compression.
abstract: Air-coupled ultrasonic spectroscopy is described, whereby the output from a pulse compression system is used. It is demonstrated that the cross-correlation operation used within a pulse-compression system preserves amplitude and phase information. This approach allows the signal-to-noise ratio and, hence, signal-detection capability to be improved by the cross-correlation, while allowing noncontact spectral information for solid samples to be obtained. Results are presented for chocolate samples, where measurements of interest to the food industry have been obtained.
authors: School of Engineering, University of Warwick, Coventry, UK.
authors: Prakash
authors: P
authors: Pallav
authors: David A
authors: DA
authors: Hutchins
authors: Xiaokang
authors: X
authors: Yin
mesh_terms: D000388:Air; D000465:Algorithms; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008422:Materials Testing / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013057:Spectrum Analysis / Q000379:methods*; D014463:Ultrasonography / Q000379:methods*; D014783:Viscosity