• State TI Thinks Resolved
  • Locked Locked
  • Replies 6 replies
  • Answers 1 answer
  • Subscribers 32 subscribers
  • Views 854 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TDC1000-TDC7200EVM: Measuring TOF in ice

Richelle Bulgin
Prodigy 40 points

Part Number: TDC1000-TDC7200EVM

I have the TDC1000-TDC7200EVM and the 1MHz piezo transducer that came with it, and I wanted to measure the TOF in a block of ice in order to determine the speed of sound. To do this I wanted to freeze the transducer directly into the ice. Can this transducer be in contact with the ice, or would this damage it? What would be the best way of protecting it while allowing it to remain in contact with the ice?

Also, what configurations in the GUI would be best for this setup? The distance would be less than 70 cm.

  • 0
    TI__Mastermind 27780 points
    Our TDC expert is currently out of office this week, and will respond to your query next week.

    Richelle,
    As long as the transducer you are using is a closed-top/face type transducer, coupling the transducer directly to the ice should be ok.
    In the PGA460's realm of ultrasonic park assist, many automotive transducer are designed to withstand harsh winter conditions including iceover/freezing of the bumper. Your coupling goal should be to ensure that their are no air bubbles/gaps between to face of the transducer and ice.

    In your end application, will you be coupling the transducer directly to the ice as you have described, or will there be an intermediate/modular means of connecting the transducer to the surface of the ice block?
  • 0 in reply to Akeem Whitehead
    Prodigy 40 points
    Thank you for responding!

    The transducer I have currently is this one: www.steminc.com/.../piezo-ceramic-disc-1-mhz
    Is it possible to modify that one so it is usable? I don’t need super accurate results at the moment.
    If I were to cover the transducer in hot glue before freezing it on the ice, would that offer adequate protection, at least for now? Or is it necessary to get a different transducer before trying anything?

    In the end application, the transducer will be in water which will then be frozen around it, but for now the transducer will just be frozen onto the surface of the ice.
  • 0 in reply to Akeem Whitehead
    Prodigy 40 points

    I ended up just putting the transducer on a plastic container for now, however I'm still having problems with the GUI configuration.

    This is the configuration I used:

    And this this is the result:

    This distance is 30 cm across, so 60 cm total. However, the ToF is not correct for that distance (If we estimate the speed of sound in ice as around 4000 m/s). I'm not really sure what to change in this setup, so any help would be appreciated.

    This is the ice/trasnsducer setup:

    Thanks!

  • 0 in reply to Richelle Bulgin
    Prodigy 40 points
    Could someone please help me I'm still not sure what I've done wrong.
    Thanks
  • 0 in reply to Richelle Bulgin
    TI__Genius 11015 points
    Richelle,

    I have received your question, and I will respond to you by tomorrow.
  • 0
    TI__Genius 11015 points
    Richelle,

    Please increase the Num_Rx to a higher value.

    Also we have not experimented with a block of ice, please check on a smaller container with ice & report the result back.