DIGITAL MAMMOGRAPHY ANALYSIS THROUGH NONSTATIONARY MRI

Not Available Evaluation of the performance of new hypersonic wind tunnel technologies will require high-speed diagnostics to follow the high frequency effects associated with the fluctuations in these high-speed flows. A system capable of digitally imaging flows at MHz frame rates is needed. The diagnostic must have high sensitivity in the ultraviolet and visible portions of the spectrum. The imaging device will be used in conjunction with various laser diagnostic techniques including Rayleigh scattering, laser induced fluorescence, shadowgraphs, and Schlieren techniques. The diagnostic instrument needs to provide (a) high energy laser pulses with a few tens of nanosecond pulse width at megahertz repetition rates, and a pulse burst interval of several milliseconds, and (b) a digital camera/recording system capable of producing high quality images that give spatial information on flow properties such as density and capable of following shock wave and boundary layer fluctuations. The laser and camera/recording system must be reasonable in size, simple to operate and reliable. The Phase I Technical objectives include demonstrating a controllable MHz pulse rate laser and digital camera/recording system operating at ~1 MHz frame rate, and to carry out the conceptual design of an integrated ultra-high-frame-rate laser/camera system, optimized for hypersonic wind tunnel diagnostic applications, that would be built and delivered to AEDC in Phase II.