A sound wave that runs through a medium loses energy during various processes (scattering, absorption, and reflection). This is called attenuation. The intensity I of the wave follows the law of attenuation I= I0 exp(-us) where (I0) is the initial intensity, (s) is the path length in the medium, and (µ) is the attenuation coefficient.
Phased Array Instrument uses square wave pulse to generate the pulse. The pulse voltage and pulse width are adjusted directly to provide precise control over pulse shape. Pulse width must be adjusted to match the probe frequency as for the formulae below: The width of the beam determines the lateral resolution. The length of the
Please note: this paper is available for download on our PDF downloads page as well. Michel Brassard, Contour Dynamics Inspection Systems, Levis, Qébec, G6V 7M5, Canada and Techno Diffusion NDT Systems, Montreal, Canada Deborah Hopkins, BERCLI Corp., Berkeley, CA 94703 JeanÂâ€NoÃ«l Noiret, EADS Composites Aquitaine, Salaunes, 33160, France Abstract: Achieving high-speed inspection rates for complex
Since Phased arrays have discrete elements, equally spaced, they can experienced side and grating lobes. They are experienced when the element spacing is greater than a half wavelength (see details below). The spatial distortion effect causes some sidelobes to become substantially larger in amplitude, and approaching the level of the main lobe; these are called