| ??? 04/30/09 15:39 Read: times |
#164966 - Rotating mirrors of limited use Responding to: ???'s previous message |
From one of my earlier posts:
Using a rotating multi-facetted mirror combined with a linear deflector is the best way for building a x-y scanner, but you will get a stronger display by instead using separate X and Y modulation and vector-plot any information. Implementing a sweep like a TV would result in a very long travel distance, that very much affects the intensity of the display. It would also limit the possible resolution. And think about the amount of work to implement something like this: http://www.youtube.com/watch?v=5...r_embedded Note that I think that the setup in the video is way too powerful for projecting onto people like that. When projecting on people on a disco, the projector should be a significant distance from the people to make sure that the ray passes very quickly. Laser light at these intensities is quite dangerous. A rotating mirror or prisma (normally found in laser printers) is fun if all you are going to do is write text, simulating a dot matrix printer. Full XY-control is generally way more useful/fun. You can for example draw lissajous curves with what looks like infinite resolution. By the way - is there anyone who know of preferably 2D galvanometers for a reasonable price for hobbyists? |
