This is off topic, because, well, there are no current topics related to it. As frequent visitors to this forum will know, the subject of object detection and ranging comes up with some frequency.
When light is mentioned, comments to the effect that the time differences are too small to be done at low cost. I often respond that my Stanley FatMax works pretty good. Technology marches on, if you can believe the specifications: accuracy ±1/16" (< 2mm); range 195 feet; cost <<$100.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=120596525141&ssPageName=STRK:MEWAX:IT
John
When light is mentioned, comments to the effect that the time differences are too small to be done at low cost. I often respond that my Stanley FatMax works pretty good. Technology marches on, if you can believe the specifications: accuracy ±1/16" (< 2mm); range 195 feet; cost <<$100.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=120596525141&ssPageName=STRK:MEWAX:IT
John