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## A transit time ultrasonic flow meter uses a pair of ultrasonic transducers placed at 45o angle, as shown in the figure. GATE-Instrumentation-Engineering-2014

The  inner  diameter  of  the  pipe  is  0.5  m.  The  differential  transit  time  is  directly  measured using a clock of frequency 5 MHz. The velocity of the fluid is small compared to the velocity of  sound  in  the  static  fluid,  which  is  1500  m/s  and  the  size  of  the  crystals  is  negligible compared to the diameter of the pipe. The minimum change in fluid
velocity (m/s) that can be measured using this system is_________.

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The  inner  diameter  of  the  pipe  is  0.5  m.  The  differential  transit  time  is  directly  measured using a clock of frequency 5 MHz. The velocity of the fluid is small compared to the velocity of  sound  in  the  static  fluid,  which  is  1500  m/s  and  the  size  of  the  crystals  is  negligible compared to the diameter of the pipe. The minimum change in fluid velocity (m/s) that can be measured using this system is 0.45 to 0.45.
One transducer transmits sound while the other acts as a receiver. As the name suggests, Transit Time flowmeters measure the time it takes for an ultrasonic signal transmitted from one sensor, to cross a pipe and be received by a second sensor. Upstream and downstream time measurements are compared.

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