On Tue, Dec 13, 2011 at 8:46 PM, P. J. Alling <webstertwenty...@gmail.com> wrote:
>> http://news.cnet.com/8301-11386_3-57342136-76/shutter-speed-demon-camera-takes-trillion-frames-per-second/ > I expect that this is just bad reporting, since the reporter, makes the > truly astounding claim that you can make ultrasound recordings with light. > I don't think those words mean what he thinks they mean. I think there's a reasonable interpretation. You introduce sound waves to an object, as in traditional ultrasound. The sound waves interact with the object in ways that reveal the internal structure, as in traditional ultrasound. Instead of coupling the returned sound waves to a piezoelectric transducer that produces an electrical signal, you observe the surface of the object with the high-speed camera, measuring the vibrations due to the sound. It probably lets you measure the return over a larger area with higher spatial resolution, compared to the transducer. So it is ultrasound, but the return is measured optically instead of piezoelectrically. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
