Ultrasonic Measurement uses sound waves to interrogate the fluid or object and determine various key properties. The sound waves are typically sent and received by a piezo electric transducer which converts electric signals to pressure waves and vice versa. In most flowmeters, the ultrasonic signals are used to precisely measure downstream and upstream transit times in a pipe. Transit time is then converted to a flow rate. The transit time also allows accurate determination of the gas sound speed, which in turn enables further properties to be calculated such as molecular weight.
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