Speed and acceleration monitoring device using visible laser beams

摘要

Apparatus for obtaining the speed and acceleration of a motor vehicle in which the speed and acceleration are used in combination with exhaust emissions data obtained from the motor vehicle to analyze information about the pollutants being dispersed into the air by the motor vehicle. The apparatus includes a first radiation source producing a visible laser beam received by a first detector and a second radiation source producing a visible laser beam received by a second detector. The first and second radiation sources are arranged along the roadway with a known spacing and at a height so that the visible laser beams are interrupted by the front and rear wheels of the motor vehicle as it passes along the roadway. The detectors provide output pulses indicating whether the visible laser beams are interrupted and the time of the occurrence of each of the pulses is measured and recorded. An analyzer then calculates the speed and acceleration from the known spacing distance and the stored time measurements.

主权项

1. Apparatus for determining speed and acceleration of a motor vehicle traveling on a roadway comprising:
a first radiation source producing a visible entrance laserfirst beam and arranged at one side of the roadway; a first detector arranged at an opposite side of the roadway to receive said visible entrance laserfirst beam from said first radiation source for producing an output signal indicating a presence or absence of the visible entrance laserfirst beam; a second radiation source producing a visible exit lasersecond beam and arranged at said one side of the roadway and being spaced apart by a predetermined distance from said first radiation source; a second detector arranged at said opposite side of the roadway to receive said visible exit laser beam from said second radiation source for producing an output signal indicating the presence or absence of the visible exit lasersecond beam; wherein front and rear wheels of the motor vehicle each interrupt said visible entrance laserfirst beam and said visible exit lasersecond beam and the interruptions are detected by said first and second detectors; and vehicle emissions testing means for obtaining exhaust emissions information for the motor vehicle; and analyzing means receiving said output signals from said first and second detectors for calculating the speed and acceleration of the motor vehicle to be used in combination with the obtained exhaust emissions information.