Monitoring leaks in drinking water supply mains with electrical output signals - using multi-sonic sensors arranged to allow correlated processing of output signals of any sensor with those of at least 2 further sensors arranged at one side

摘要

The sensors (211-21N) are activated synchronised together for time spans of the same duration, which is significantly greater than the transit time of the sound, between the sensors adjacent to each other in the direction of the spreading sound. The level of the output signals in the sensors are stored in individually allocated electronic stores (27), in the time sequence of their prodn. and also are arranged for call up in this sequence. The correlating processing of the stored sensor output signals, results by the calling up and evaluation of the data able to be correlated of at least two stores (27), using sensors adjacent to each other, successively for each line section of the mains (10) selected by such a pair of sensors.