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3v battery powered ultrasonic sensing for 3M range

Donal Geoghegan
Prodigy 30 points
Other Parts Discussed in Thread: TDC1011

I am looking at the TDC1011 or the PGA450Q1 for a tank level sensing solution. The TDC1011 may be more suited as it operated at 3v and my design will operate from a 3v battery. I want to measure the level of oil/water in a tank. The tank will be a cylinder and could be upto 3v in depth/height/diameter. The sensor will be at the top of the tank and so will be measuring the air and echoing off the liquid.

Is the TDC1011 a suitable part for this application considering 3m range requirement?

The webench design tool recommends the following transducer, but sense we will be measuring air rather than water are these the best options and the best resonant frequrency?

And considering the 3M range also. Steminc SMD10T2R111WL Steminc SMD15T21R111WL AudioWell AW5Y15.5200AL145 AudioWell AW5Y14200A CTD TPC-D1020S

  • 0
    TI__Genius 16890 points

    Hi Donal,

    Please take a look at this forum post:

    This shows a measurement from the top with a distance of about 70cm.  You may be able to go farther by driving the transducer with a higher voltage and by better focusing the beam.

    Mike

  • 0 in reply to Michael Stout
    Prodigy 30 points
    Not a very comprehensive reply.
    Should I be able to get 3M, which is a lot further than 70cm?
  • 0 in reply to Donal Geoghegan
    TI__Genius 16890 points
    Hi Donal,

    This will need to be something that you try. We have been able to go out to 70cm. Using the techniques listed in the blog post above along with driving the transducer with a higher voltage than we used and trying to focus the beam may enable you to go to a further distance. Another idea is to use a wave guide which is a way to stop the beam from spreading. This is described in section 3.3.14 of the publication snaa270.pdf on the ti.com website. You would use it from the top side instead of from the bottom side. You will have to do some experimenting to see if it will work.

    Mike