Apparatus for detecting changes in parameters of liquid flowing in a pipe based on sing-around method

摘要

Apparatus for detecting changes in parameters of a liquid flowing in a pipe based on the sing-around method, comprises: a set of a transmitting probe and a receiving probe arranged opposite to each other on the outer surface of a pipe for transmitting and receiving an ultrasonic pulse; a masking circuit for transmitting a masking signal in response to a signal from said receiving probe; a one-shot pulse generator circuit for transmitting a pulse in response to said masking signal from said masking circuit; a masking time setup circuit for setting up a masking time of said masking signal of said masking circuit; a receiving monitor-time setup circuit and a pseudo-pulse generator circuit for transmitting a pseudo-pulse; a voltage/power converter circuit for converting said pulse from said one-shot pulse generator circuit into a power signal; and an output section for taking out said pulse from said one-shot pulse generator circuit as an output.