Implementation of a novel pulsed ultrasonic Doppler velocity profiler

The objective of the work is to apply advanced digital signal processing (DSP) and pulsed Doppler echography techniques to analyze velocity profile of the measured fluid in a closed full-pipe. In order to reliably measure velocity profile where non-intrusive ultrasonic Doppler velocity profilers (UDVPs) cannot properly transmit and receive ultrasonic signals, a single-crystal transducer was inserted directly into the fluid stream. Then ultrasonic signals were transmitted and received based on the pulsed Doppler echography theory. A modified covariance (MCOV) estimator and a TMS320VC5410 DSP chip with a high-speed up to 160 MIPS were employed to analyze spectrum of the software-gated echo signals. Finally, computer simulations were also presented to demonstrate effectiveness of the novel UDVP. Results indicate that this instrument is particularly effective in terms of velocity profiling and can be widely applied for flow measurement and fluid dynamics research.