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Methods and apparatus for measuring the cross-sectional area of a duct and the volume flow rate of fluid in the duct
Methods and apparatus for measuring the cross-sectional area of a duct and the volume flow rate of fluid in the duct
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机译:用于测量管道的横截面积和管道中流体的体积流量的方法和装置
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摘要
Apparatus for measuring the area of a blood vessel and the volume flow rate of blood in such vessels, comprises an ultrasonic Doppler velocimeter (10, 12, 14 and 26) which derives a number of velocity signals dependent on the number of different velocities in a duct (13) and is coupled by way of a limiter 15 to a frequency-to-voltage converter 16 which therefore has an output with one component for each velocity signal. A further frequency-to-voltage converter 21 provides a signal dependent on the number of velocity signals and since this number depends on the duct area, the output from the converter 21 is a measure of this area. By using another frequency-to-voltage converter 23 and a mean detector 24, a mean velocity signal is obtained which when multiplied by the area signal generates volume flow rate. IMAGE
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