DEVICE TO CONTROL CLEANING TOOL PASSING IN PIPELINE Russian patent published in 1995 - IPC

FIELD: detection of leaks in pipelines for liquids. SUBSTANCE: amplitude detector, comparator with source of reference voltage and indicator are in series connected. Output of coincidence circuit is connected to indicator, its inputs - to pulse selector of maximum signal, connected to input of comparator, and to pulse selector of signal duration, connected to output of comparator. Narrow band acoustic filter is set at input of receiving acoustic-electrical converter, output of which through corresponding amplifier and in series connected resonance frequencies unit with additional amplifier at output and amplitude detector, is connected with input of comparator. Acoustic conductor is made in the form of plate of one fourth of wave thickness of acoustic input signal average length. EFFECT: device is used to detect leaks in pipelines for liquidus. 3 cl, 2 dwg