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TDC1000: Measurement Range clarification

Pavan HW
Prodigy 10 points
Part Number: TDC1000
Other Parts Discussed in Thread: TUSS4440

Tool/software:

Hi,

I want to use TDC1000 for my Water level sensing application for detecting level of water in over head tank. For this I want to install the sensor setup on top of tank. (I understood to have the advantage of higher speed of sound in water, bottom side installation is preferred but it is not possible in my application)

I have seen in the data sheet the measurement range is 8ms. I have calculated the max distance the device can measure is as follows

Speed of sound in air 340m/s

Max TOF measurable 8ms that means in one direction it is 4ms

Distance measurable = 4ms * 340m/s = 1.36m.

Is the above understanding correct?

Actually I want to measure a max distance of 5m. Is there any solution from TI for this range?

Regards

Pavan

  • 0
    TI__Mastermind 43760 points

    Hi Pavan,

    I would not recommend the TDC1000 for this application.  TDC1000 is best utilized in 1MHz applications where water is the medium.  For air medium and 5m range, I recommend TUSS4440 operating with a lower frequency transducer.  See the plot below from the TUSS4440 datasheet comparing frequency and sound pressure over distance.  It is also important to understand the minimum distance requirement.  As you can see there is a larger minimum detection distance for lower frequencies due to the requirement for the excitation pulses to decay.  The app note below also has some information on minimum detection distances.

    https://www.ti.com/lit/an/slaa907d/slaa907d.pdf