I was going to suggest placing the sensor inside a half ping pong ball but figured that the light would be attenuated too much. Using it as a reflector sounds a much better idea. RP 2008/5/16 Robert Rolf : > PING PONG BALL. > > Sensor looks up at ball from about 2" distance (depending > on sensor beamwidth). > Diffuse white surface reflects impinging beam into > sensor field of view. > You loose some range, but it works MUCH better than a polished > steel ball bearing (which I also tried). > The b/b gives you a tiny specular reflection. The white ball > gives a a large area the sensor more readily sees. > > I use half balls on my living room stereo gear so I can hit it > with the remotes from the workroom, at a 180 degree angle. > > Forums wrote: > >> Cedric Chang wrote: >> >> >>>Another thing that might help is a space blanket, real thin material >>>$2-$3 at Walmart. >> >> >> Yeah, those are made of PET film, better known under a trade name 'Mylar'. >> NASA have used the stuff on satellites and landers etc. to reflect heat from >> the sun. A single sheet will reflect 90%+ of IR. >> >> You can also get it from party shops, in the form of a gold or silver gift >> wrap... but if it tears easily, it's not PET. >> >> One concern here is I would expect the reflection to be very directional >> just like the visible light is, so making it mirror-flat might not be >> perfect for what you are trying to do. A laser pointer might be useful to >> get the angles correct for a specific situation, and most video cameras are >> sensitive to IR (not extremely, but enough to see the light from a remote >> control) so it might be a useful calibration tool. >> >> Andy >> > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist