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TDC1000-TDC7200EVM: Minimum travel distance between transducers

Thibault Helle
Expert 2090 points

Part Number: TDC1000-TDC7200EVM

Hello!

I am using the TDC1000 evaluation board (TDC7200EVM) and I need to choose the right transducer for my application. I will use it for water flow measurement in pipes of approximately 12-28mm in diameter, in diagonal set-up (not reflective). 

Is there some kind of known relationships between the frequency of the transducers and the minimum travel distance between those ? 

Thanks in advance for any help! 

  • 0
    TI__Mastermind 31655 points
    Hello Thibault,

    The frequency's effect on the minimum distance is generally only an issue with a single transducer acting as transmitter and receiver, so there should not be any issue with a dual transducer setup unless they are very close (right next to) one another, or if the frequency gets so low that the wavelength is greater than the distance between the transducers.

    For reference, in a single transducer setup the lower the frequency, the longer time it will take to excite the transducer, and the longer the transducer will continue ringing after the excitation has ceased. Because of this continued ringing, the return echo may be obscured by the ringing and impossible to detect.

    Typical water flow measurement frequencies are in the 1-2Mhz range.

    Regards,
  • 0 in reply to Scott Cummins
    TI__Mastermind 31655 points

    Hi Thibault,

    There hasn't been any activity on this thread in a while, so I am closing it. If you have followup questions just post and it will reopen.

    Regards,