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- W2106930607 abstract "Ultrasonic guided wave imaging with a sparse, or spatially distributed, array can detect and localize damage over large areas. Conventional delay-and-sum images from such an array typically have a relatively high noise floor, however, and contain artifacts that often cannot be discriminated from damage. Considered here is minimum variance distortionless response (MVDR) imaging, which is a variation of delay-and-sum imaging whereby weighting coefficients are adaptively computed at each pixel location. Utilization of MVDR significantly improves image quality compared with delay-and-sum imaging, and additional improvements are obtained from incorporation of a priori scattering information in the MVDR method, use of phase information, and instantaneous windowing. Simulated data from a through-hole scatterer are used to illustrate performance improvements, and a performance metric is proposed that allows for quantitative comparisons of images from a known scatterer. Experimental results from a through-hole scatterer are also provided that illustrate imaging efficacy." @default.
- W2106930607 created "2016-06-24" @default.
- W2106930607 creator A5058069153 @default.
- W2106930607 creator A5058576641 @default.
- W2106930607 date "2010-10-01" @default.
- W2106930607 modified "2023-10-18" @default.
- W2106930607 title "Minimum variance ultrasonic imaging applied to an in situ sparse guided wave array" @default.
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- W2106930607 doi "https://doi.org/10.1109/tuffc.2010.1692" @default.
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