Patent ID: 6781110
Filing Date: 2004-08-24
Classification: G01P,G08G

Abstract:
An apparatus for measuring at least one of a speed and acceleration of a vehicle traveling on a vehicle path, the apparatus comprising:a first radiation source arranged on a first side of the vehicle path that emits a radiation beam towards a second, opposite side of the vehicle path; first reflector arranged on the second side of the vehicle path from the first radiation source that receives the beam from the first radiation source and reflects the beam in a direction generally parallel to the vehicle path; a second reflector arranged on the second side of the vehicle path that receives the reflected radiation from the first reflector, and reflects its towards the first side of the vehicle path; a first radiation detector arranged at the first side of the vehicle path that receives the reflected radiation from the second reflector; a beam splitting element located on the side of the vehicle path between the first and second reflectors, that projects a first partial beam towards the first side of the vehicle path and a second partial beam towards the second reflector; and a second radiation detector arranged on the first side of the vehicle path that receives the first partial beam.