| 摘要 |
A method of determining the flow rate of a viscous fluid stream comprises passing the fluid stream through a field of view of an electronic imaging device, which produces output signals representing images of the fluid stream at successive times t0, t1, ...t n. Signals representing an image of the fluid stream at a first time t i are stored in a first memory, while signals representing an image of the fluid stream at a second time t j, are stored in a second memory. The time t j- t i is less than the time taken for a point on the fluid stream to cross the field of view of the imaging device. The stored signals are then analyzed to derive width signals W(y) representing the width of the fluid stream as a function of y, where y represents a coordinate in the direction of fluid flow, and the first and second stored stream in the respective images represented thereby. A signal representing the flow rate of the fluid stream is derived from the width signals W(y) and signals representing at least the y coordinates y1, y2 of the common point in the respective images. This method permits the continual monitoring of the volumetric flow rate while taking into account fluctuations in the width of the stream.
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