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EVM430-FR6047: EVM430-FR6047 SENSORS 1MHz

ido amgar
Intellectual 440 points
Part Number: EVM430-FR6047

Hi
I currently use 1MHz sensors.
The more I try to read the ADC on thick pipes, the more difficult it is
I wanted to know if I should look for sensors of less than 1MHz? or more than 1MHz?

That is, the more I transmit at a higher frequency, will it help me get through the channel and read a good signal? or the opposite?

  • 0
    TI__Genius 12060 points

    Hi Ido,

    Are you planning to use a "clamp on" design, where the transducers are mounted outside of the pipe?

    We have experimented with clamp on designs but had some difficulty as signal attenuation can get very high, resulting in bad readings. Generally speaking, for water meters, we recommend 1-2.2MHz transducers. I also believe that lower frequencies typically travel better, but not very sure. You may want to read How to Select and Mount Transducers in Ultrasonic Sensing for Level Sensing and Fluid ID for some information about selecting transducers. 

    I do not think that this boils down to high frequency = high attenuation and low frequency = low attenuation, and that it will also depend on the pipe medium and thickness. It may be best for you to try different transducer frequencies on different pipes to try to characterize their responses on your own.

  • 0 in reply to Dylan OBrien
    Intellectual 440 points

    I naturally thought so too,
    If I use a larger tube, the distance between the sensors is greater, then I will need a lower frequency so that the wave passes more easily.

    I will add a small question, I use 1MHz,


    Is this where I control the frequency of transducers?
    I don't understand well enough, do I need to replace transducers, or simply calibrate the transmission frequency from here?

  • +1 in reply to ido amgar
    TI__Genius 12060 points

    When you are using 1MHz transducers, you should enter that value in the section of the GUI that you've indicated, correct.

    When you want to change the frequency that we use, you will need to change the transducers to ones that are rated for that frequency, and you will need to change that value in the GUI to account for the new excitation frequency.

    Also, as a side note, when you are using a new set of transducers, it is unlikely that their rated excitation frequency is exactly as specified in their datasheet. This is when we would suggest that you use the frequency sweep feature to test for the optimal excitation frequency used on the transducers. You specify the range for this using the "transmit frequency" box as well. I think I may have already sent this link to you but just in case, the USS Academy has some notes on how to perform the frequency sweep.

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