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TUSS4440: Ultrasonic sensors for ultrasonic thickness measurements of solids

Jonathan Geronga
Expert 7930 points
Part Number: TUSS4440
Other Parts Discussed in Thread: TUSS4470

Hi Team,

Our customer has a project using ultrasonic sensors for ultrasonic thickness measurements of solids. The sensors would be at extremely high temperatures may be up to 3000F.

For the application, they would like to take a thickness measurement of a composite, ablative material, that is on top of another solid (metal/other composite) from one side that is from under the metal.

The customer saw TUSS4440 and have questions about two options. The material thickness and flaw Detection:
Could those measure the reflected signal in a frequency domain to find a phase shift or those only measuring a time of flight round trip?
if only time of flight, how does the receiver recognize a reflected wave.
Can these work with another solid layer in between the sensor and the measured solid thickness?
The monitor changes to environment sensors, TUSS4470, Is the Echo start and stop pulse output be returned in the frequency domain or is it only returning boundary changes locations?
Can you measure a Doppler shift if the sensor is fixed to the two solids but one of the solid back surface is getting closer to the sensor.

Please let me know if you have any questions with the customer.

Thanks,

Jonathan


  • 0
    TI__Expert 6935 points

    Hi Jonathan,

    Just to make sure, do you know what temperature would the TUSS4470 be exposed to? We would need to verify that the TUSS4470 would operate within its recommended temperature range.

    Also, can you tell me the input frequency and what would be the expected return signal for this application?

    Thank you,

    Mekre

  • 0 in reply to Mekre Mesganaw
    Prodigy 10 points

    Jonathan and Mekre, 

    Thank you both for your response and I apologize for the delayed response. 

    In terms of application to clarify the questions above, we are looking to measure the thickness of a composite material layer, that is placed on top of a metal or another composite layer, from one side, that is under the metal layer. The composite material layer will be reduced across time and we would like to measure that change. 

    Regarding the Temperatures, the application is in high temperature surface application outside of the recommended range but since this is an R&D effort we will be designing a cooling system around the sensor body and board to make sure the temperature stays under the temperature range. The surface of the sensor material would be the hottest point and would exposed to a surface temperature maybe up to 3000F, could that surface material be custom made out of tungsten or other material? or could we place it far from the surface and have three boundary layer changes(Air, Metal, Composite)? Could we measure the doppler shift or the start and stop pulse at these temperatures?

    In terms of frequencies to be used, we are currently not that far a long in the project, we are still in the feasibility stage. I believe the thickness we would be dealing with would be under 10 inches of the metal and composite, and resolutions maybe in millimeters order of magnitude (still not defined), and again we would be measure from under the metal layer. If there are materials I could refer to regarding selecting the right frequency for these ranges, that would be great.  

    My question on the TUSS4470, could it measure the start and stop pulse through the two solid layers? 

    please let me know your thoughts.

    Is this forum public? if not, I could give further details about the idea and the system

    Thanks, 

    George

  • 0 in reply to George Elias
    TI__Expert 6935 points

    Hi George,

    This is actually a public forum and not a private forum.

    To properly detect a material, there must be a large acoustic impedance mismatch between the different boundaries, as is described in the below video:

    https://training.ti.com/ti-precision-labs-ultrasonic-sensing-physics-ultrasound?context=1139747-1139746-1147829-1147766

    The following video also provides some insight into factors to keep in mind when choosing a transducer:

    https://training.ti.com/ti-precision-labs-ultrasonic-sensing-ultrasonic-transducers?context=1139747-1139746-1147829-1147767

    Do you have a diagram that illustrates what you are trying to do? If so, can you please provide it?

    Thank you,

    Mekre