| 摘要 |
An apparatus for measuring a volume flow of a gaseous medium in a pipe with a high time resolution includes a first sonic transmitter which generates first sonic signals. The first sonic signals are deflected by a first deflecting mirror in a direction towards a first sonic receiver before passing through the pipe along a predetermined path. The path is configured at an angle relative to the volume flow. The apparatus further includes a second sonic transmitter for generating second sonic signals. The second sonic signals are deflected by a second deflecting mirror in a direction towards a second sonic receiver which is located at the opposite end of the path. The first and the second sonic receivers are located in the surface of the deflecting mirrors in such a way, that the first and second sonic signals impinge on the sonic receivers before entering the path, thereby generating respective trigger signals which are supplied to a control and measuring unit. From the trigger signals, the control and measuring unit determines the run times of the first and second sonic signals, and afterwards computes the volume flow of the gaseous medium in the pipe on basis of the run times.
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