Abstract
A novel, simplified and inexpensive solution to the on-line monitoring of low fluid flow is reported. The method can utilise a variety of common liquid flow sampling devices (i.e. fraction collector volumeters) as a front-end, constant-volume dispenser coupled to a described sample-and-hold circuit. The latter, on triggering, samples a variably set ramp voltage which is directly proportional to liquid volume flow rate. The system is easily calibrated, has a wide dynamic range of volume flow rates, and can be configured accurately for high signal resolution of very low flow phenomena. An application to coronary flow measurement is provided as well as circuit descriptions and typical performance parameters which can be measured and adjusted for optimisation.
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