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TDC1000-C2000EVM: Interfacing with TDC 7200 for speed of sound in liquid measurements

steven tian
Prodigy 10 points
Part Number: TDC1000-C2000EVM
Other Parts Discussed in Thread: TDC7200, TDC1000

Tool/software:

Hello! Is there an easy way of using the TDC7200 as the stopwatch when using the TDC1000 evaluation board? If not, is there a suggested way of pairing them together?

Also, how do you recommend we account for the time taken to transmit the wave through the tank material when using an externally mounted transducer? Is there a better way than simply calibrating with known liquids?

For reference, we are attempting to very accurately measure the speed of sound in some fluids for which it is unknown, so we need absolute values, not relative values (as was demonstrated in the application report).

Thank you!

  • 0
    TI__Mastermind 23045 points

    Hello Steven,

    Thanks for posting to the sensors forum! There isn't a super straightforward way to do this but if you are willing to try I think the way to do it would be to connect the TDC7200 trigger via the TP3 test point to the TDC1000 R26 resistor. The START and STOP signals from the TDC1000 would need to be connected to the TDC7200 board via the J4 and J5 connector.

    The devices would need to connect to their respective GUI's for programming but after they are programmed you should be able to use the TDC7200 GUI to trigger measurements on the TDC1000 as this will toggle the TRIGG pin causing the TDC1000 to emit its pulses. I have not tested this but I believe it should work.

    As far as taking the tank into consideration, I have not come across any other users using this method. But this may not provide much improvements to the measurement accuracy as the speed of sound through solids is extremely fast so since the tank must be thin anyways the delay caused by the tank would not be discernable.

    I am not sure what you mean by relative vs absolute measurements for your applications that would be helpful to understand.

    Best,

    Isaac