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How to measure electro-mechanical coupling of a piezo-ceramic transducer under a tank?

Niloy Talukder
Prodigy 90 points

Hello,

I have mounted a piezo-ceramic ultrasonic transducer (MODEL # SMD10T2R111WL, Vendor Website: PIEZO CERAMIC DISC 10X2MM R 215 KHZ WIRE LEADS) under a plastic tank using epoxy. Please see the below picture.

Is there a way to measure the electro-mechanical coupling of the transducer under the tank?

From the specs of the transducer, the electro-mechanical coupling coefficient is >= 60%. What is the meaning of it? Is there a way to measure it?

I know one way is to use TDC1000-TDC7200 EVM board and perform fluid level sensing. I am wondering is there any easier way to test the coupling?

Thanks in advance for your help.

Best,

Niloy.

  • 0
    TI__Mastermind 31655 points
    Hello Niloy,

    The electro-mechanical coupling coefficient is a measure of the efficiency of the transducer at converting electrical energy to acoustic energy in a piezoelectric material. This is something measured by the manufacturer of the transducer. If you would like to see the relative change in this efficiency after gluing it to your container, you could excite the transducer and measure the SPL it produces at a fixed distance both before and after gluing it to the container. The difference in SPL will be proportional to the change in efficiency.

    As for measuring the coupling coefficient on its own, I suggest contacting the manufacturer of the piezo transducer.

    Regards,
  • 0 in reply to Scott Cummins
    Prodigy 90 points

    Hi Scott,

    I did not understand the SPL measuring method that you proposed. Can you please explain in detail? Thank you so much.

    Best,

    Niloy

  • 0 in reply to Niloy Talukder
    TI__Mastermind 31655 points
    Hello Niloy,

    I have not performed this specific measurement before. My suggestion was mainly to be used as a starting point. However, to measure the Sound pressure level (SPL) you will need a microphone that is calibrated up to the frequency that your transducer is operating at.

    Regards,