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TUSS4470: Switching the Tx and Rx sensors in a bistatic configuration for non-intrusive time of flight measurement

Kris Leo Barboza
Prodigy 20 points
Part Number: TUSS4470
Other Parts Discussed in Thread: MSP430FR6043, MSP430FR6047

Hello, 

We are looking to leverage the time-of-flight measurement capability of the TUSS4470 in a non-intrusive application.

Our setup includes a rectangular plastic container open on both ends to airflow. Wall to wall distance of the container is 4cm.

We aim to make a time-of-flight measurement across the container with the sensors in a bistatic arrangement.

Sensors will be coupled to the plastic container externally as described in TI document snaa266a

Another objective is to measure the time-of-flight variation when there is airflow.

We have chosen 240 and 500 kHz transducers as candidates for this trial.

Can the TUSS4470 support sensors in a bistatic configuration in the use case mentioned above.

Also is it possible to switch the Tx and Rx sensors to enable a velocity measurement using the time-of-flight difference. 

  • 0
    TI__Mastermind 43530 points

    Hello Kris,

    Yes, the TUSS4470 could support this type of bi-static configuration.  The device itself is not able to switch the TX and RX transducers for velocity measurement.  This would need to be done externally through mux.  

    For your application, I would recommend the MSP430FR6043.  This device is really intended for the type of velocity measurements using delta time of flight and is able to support switching TX/RX without any external components.  

  • 0 in reply to Eddie LaCost
    Prodigy 20 points

    Hi Eddie,

    Thanks for the reply, one of our main concerns has been to be able to penetrate through the plastic. The support on MSP430FR6043 indicated that a high power transducer would be needed, but on reading through the documentation in snaa266a, it seems like you were able to penetrate a fairly thick plastic with a 5V signal. 

    Are there any specific transducers you would recommend to penetrate through the plastic. We are currently using  240 and 500 kHz ceramic transducers to penetrate the walls of our container (1.0mm thick ABS). We would be looking to mount the sensors on the same wall to enable a pitch catch configuration. 

    Is this a feasible arrangement given that the medium inside the container will be gas and the only reflective surface would be the opposite plastic wall.

  • 0 in reply to Kris Leo Barboza
    TI__Mastermind 43530 points

    Kris,

    I think you would likely be okay with the 5V signal since your range is also pretty short.  For water flow applications, I was able to use the MSP430FR6047 with 1MHz transducers clamped on the outside of a PVC pipe.  This was in a face to face configuration of the transducers.  

    I don't have any specific transducer recommendation for this use case.

    The other consideration is what type of gas you have as many gases will attenuate the signal.