Townsend, Middlesex County, Massachusetts, United States road map, satellite view, street view, terrain map, photos... Townsend, MA is situated at 42.67Â° North latitude, 71.71Â° West longitude and 91 meters elevation above the sea level.
Time of Flight. The simplest way to think about âtime of flightâ laser scanning is to look approach it as nothing more than a laser range finder. I think we all understand how a laser range finder works. It basically measures a distance by shooting a laser beam out to an object and measuring how long it takes that laser beam to bounce back.
Now looking in closeup at the scanner: It has a lens on top that spreads the light reflected off the barcode. The light from the lens spreads out onto a larger glass surface. An electric motor and axle (red) move a scanning head (green). Guided by the grooves in the axle, the scanning head moves from side to side.