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Original question:

TDC1000-Q1: TIDA-00322EVM

TDC1000-Q1: TIDA-00322EVM

PY YEN
Prodigy 30 points
Part Number: TDC1000-Q1
Other Parts Discussed in Thread: TDC1000

HELLO   ~  ISSAC  :  

It has  a long time  not to consult the TDC1000  with  you ,  here  it is glad for me to thanks for your help and  support before.  

there is still one question to consult with you.

we utilize a  water container with acrylic material  and the bottom thickness is about 30 mm ( it is thicker than gereral one，and we know it is not a correct design) ,  we detect the height of water from the bottom and hence the sound wave goes through the 30 mm bottom thickness ， the sound wave TOF is also calculated  . 

The question is that the  TOF  of  bottom thickness ( acrylic material ) is included ??  or it could be ignored ?  we know the sound speed of solid material is faster than clean water ,  however the TOF of  bottom thickness could be ignored ? 

thanks for your help~          

  • +1
    TI__Mastermind 43580 points

    Hello PY,

    30mm is a fairly thick acrylic container.  The ToF would likely be affected, because, as you mention, the speed of sound will be faster in this medium than water.  For your system, I think you could consider a few things.

    1. Drill a recess into the bottom of the container where the transducer could sit with a smaller thickness.  If the wall can get to a few mms thick, you could ignore the ToF of the acrylic since it is minimal.  I am not sure whether this would be mechanically feasible for your application.
    2. Does the measurement need to be absolute or relative?  If the measurement is relative then the different mediums shouldn't make a difference as all measurements would be in the same environment. 
    3. You could also consider an offset if the data is linear.  You could monitor the ToF with and without the thick container at different levels and determine an offset that could work over the range of measurements.
  • 0 in reply to Eddie LaCost
    Prodigy 30 points

    OK  ~   THANKS  FOR YOUR  SUGGESTION AND  HELP ~