| 摘要 |
Apparatus and a method for measuring the flow rate of a fluid in which a beam of ultrasonic, electromagnetic, optical or other radiant energy is transmitted across the flow at each of two positions spaced apart in the direction of flow, the noise amplitude, frequency or phase modulation on each beam due to disturbances in the flow is detected, and the two resultant signals are cross-correlated to determine the time delay therebetween producing maximum correlation, i.e. the mean fluid transport time between the beams, and thus the mean fluid flow rate.
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