Radiometer

A radiometer is a simple, but fascinating toy-a rotating vane inside a glass bulb that spins when sunlight energizes it.  Now, imagine a micro-version of this motor placed at the end of a catheter with a camera, and powered by a laser light source.  That’s the idea University of Texas at Austin researchers have developed  to get 3D images inside blood vessels, in a technique called optical coherence tomography.  The advantage of the radiometer is that it produces minimal voltage to do the job, where higher current would be dangerous.          MORE

Image Credit:  InsideScience.org