ES327644A1 - An apparatus to determine the speed of vehicle that travels a known distance along a particular path. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Apparatus for determining the transit time of a vehicle by a known distance along a given trajectory, comprising the combination of: means for radiating energy to regions of said trajectory that define the beginning and end of said known distance; first and second receiving means for receiving the reflected energy of said vehicle when it is at the beginning and at the end, respectively, of said known distance; detector means selectively coupled to said receiver means to produce signals only in response to the reflected energy received from said vehicle; switch means for selectively coupling said detector means to said first receiver means, and which can be operated in response to an activation signal for selectively coupling the detector means to said second receiver means; a bistable element coupled to said detector means for producing an activation signal in response to a first detector signal, which in turn occurs in response to the energy reflected by the vehicle when it is at the beginning of said known distance; means for coupling said activation signal to said switching means; time regulating means that respond to said activation signal by starting a time signal; means coupled to said detector means for producing a termination signal when said second receiving means receives the reflected energy of the vehicle at the end of the known distance; said time control means being adapted to receive said termination signal and, in response to it, act to end said time signal. (Machine-translation by Google Translate, not legally binding)