Utilizing a Doppler ultrasonic flowmeter catheter, right carotid artery blood velocity was measured during 91 coughing episodes in 16 patients. Such coughing reduced carotid blood velocity by 40 +/- 22% (control = 34 +/- 8 cm per second, cough = 20 +/- 9 cm per second, p less than 0.001). There was an insignificant low degree of corrleation between the level of simultaneously recorded mean righ...

Flowmetry. Fluid-flow measurement and visualisation ................................................................................ 1 Measuring mass flow-rate ......................................................................................................................... 2 Accumulative weighting .............................................................................................

Abstract: This paper describes the architecture and performance of a high-resolution time–to– digital converter (TDC) based on a Vernier delay line. The TDC is used as a basic building block for time interval measurement in an ultrasonic liquid flowmeter. Operation of the TDC with 10ps LSB resolution and 1 ms input range has been simulated using library models for 1.2 μm double–metal double–pol...

The paper describes the development of a non-invasive flowmeter for lower flow rates and its first tests. This gauge is physically based on interaction fluid with an ultrasonic signal that passes through from transmitter to receiver. Ultrasonic flowmeters are currently relatively commonly used gauges, whose advantages such as non-invasiveness (i.e. zero pressure losses) ability seamlessly measu...

Sandy water sources are widely distributed and important for agricultural development. However, no explicit result has been achieved in the research of accuracy reliability pipeline metering devices as well flow rate measurement objects (water or water–sand) different process pipelines conveying muddy water. In this study, seven kinds sediment concentration gradients, C0–C6 (0.2–7.19%), three v...