Conversion of a fluctuating signal corresponding to a transit time between two landmarks into a voltage proportional to the average speed

摘要

Electronic device of averaging of the transit time measurements by a sensor 1, with return loop 24, 25, 26, 12 for the correction of the derivatives, including a simulator of the sensor 13, a comparator 10 of the durations of the signals of the sensor 1 and of the simulator 13, two analog gates 16, 21 a monostable 22 synchronized by the comparator 10 of time, a integrator 20 and, if appropriate, a timer 29 trigger the measurements in the sensor 1. The simulator 13 is controlled by the output voltage of the integrator 20, which represents the mean voltage sought. / p & & p & a signal of variable width is available at the output of the simulator 13. / p & & p & application to motor vehicle anti for the measurement of an average speed and in particular that of a gaseous fluid.