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TDC1000 Webench Tool setup question

Eric Chen4
Expert 2370 points
Other Parts Discussed in Thread: TDC1000, TDC1000-C2000EVM

Hi

Now I using TDC1000 Webench tool to Calculated expected time-of-flight (TOF), but I have some question as below.

1. Does the Distance need to add the object thickness?

    Ex: If the object  thickness is 2mm & internal width of the object is 100mm then  distance  need to define 100mm or 102mm?

2.  How can to define the distance to 50mm through Webench Tool? Current only setup to 0.1m as below.

     webench.ti.com/.../index.html

     

3. What meat is the "% Change in Medium"?

Thanks your help.

  • 0
    TI__Mastermind 21685 points
    Eric,

    1. No need to add thickness
    2. Tool is assuming your container width is at least 10cm and this limitation is related to ultrasonic technology based detection as it relies on getting a good echo from the far object. If you have a very small tube, ultrasonic is not suitable as there will be echo of echo and cannot measure reliably. You will have mounting issues as well.
    3. This is percentage change in speed of sound because of concentration change. The TOF calculation shown on the right side uses this %change to calculate expected TOF.

    Thanks,
    Vishy
  • 0 in reply to Vishy Viswanathan
    Expert 2370 points
    Hi Vishy,
    For Item2, I have another question about container width, you said 10cm that is getting a good echo from object. But I check another TDC1000-C2000 EVM kit and use 30mm container to measure the Level and Concentration as below.
    TDC1000-C2000EVM: Ultrasonic Sensing for Level and Concentration Measurement Evaluation Module
    Tool/Software Folder: www.ti.com/.../tdc1000-c2000evm.html
    So is the 30mm OK for Concentration Measurement and doesn't need 10cm width?
    Thanks your suggestion.
  • 0 in reply to Eric Chen4
    TI__Mastermind 21685 points
    Eric,

    I realize the issue: I confused between mm and cm. I meant 10mm width is a problem as the transducer ringing itself takes sometime to die down. 10cm shouldn't be an issue and regarding your question 2, it's more a webbench tool limitation. Yes, the test cell we use is 30mm width or 3cm. Thanks for catching that.

    Thanks,
    Vishy