LEVEL MEASURING DEVICE OPERATING WITH ULTRASOUND

摘要

A level measuring device operating with ultrasound with high measuring sensitivity and low blocking distance is disclosed, comprising an electromechanical converter (1), for the transmission and receiving of ultrasound, an analogue to digital converter (19), connected to the electromechanical converter (1,) a digital to analogue converter (27), connected to the electromechanical converter (1) and a digital signal processor (21), with an input (23), to which the analogue to digital converter (19) is connected and an output (25), to which the digital to analogue converter (27) is connected and which serves to generate digital signals which are converted into analogue form by the digital to analogue converter (27) and applied to the electromechanical converter during a transmission interval, to record received signals from the analogue to digital converter and to derive a damping signal from the received signal, for reducing the time necessary for a damping of the electromechanical converter (1) and, following the transmission interval, to apply the same to the electromechanical converter in analogue form by means of the digital to analogue converter.