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TDC1000-C2000EVM: Measurements range

Ravi Bhadaniya
Prodigy 155 points
Part Number: TDC1000-C2000EVM
Other Parts Discussed in Thread: TDC1000

Hi,

1. To measure the concentration what can be the maximum distance do you think around 1.5 feet in diameter measurable with 1Mhz transducer?

2. Is concentration measurements of chemical liquids also possible? Ions present in the liquids changes can that be detected in concentration?

3. I am using this sensor do you think it is suitable for my measurements for concentration, fluid level and flow rate    

  • 0
    TI__Mastermind 31655 points
    Hi Ravi,

    1. A distance of 1.5 feet should be fine in a fluid.
    2. What you are really measuring is the speed of sound in the fluid which is mainly related to the density of the fluid. If the addition of ions affects the density of the fluid, then the speed of sound will change and you will be able to detect the concentration using ultrasonic.
    3. You are using this sensor for all 3 types of measurements? Typically different sensors are used for flow rate vs concentration and level. The resonant frequency of the transducer you have linked would be suitable for a flow application, but it would require a special enclosure to measure the flow rate. For level and concentration I would recommend using this Steminc transducer, as it is a good fit for a wide variety applications: www.steminc.com/.../piezo-ceramic-disc-1-mhz

    Regards,
  • 0 in reply to Scott Cummins
    Prodigy 155 points

    Hi,

    Can you recommend me any from Europe companies as the shippment for the company you said is 5 times the price of sensor. Can you tell me how should i make my connections from sensor to TDC1000-C2000EVM and how am i suppose to read it out on software. My software does not show fluid level, concentration and other as per other information i saw. Neither it shows update software in debug.

  • 0 in reply to Ravi Bhadaniya
    TI__Mastermind 31655 points
    Hello,

    Please see the TDC1000 datasheet which includes equations for calculating flow rate, liquid level, and concentration based on the time of flight. Note that concentration is dependent on the substance you are measuring, and you will have to generate some application curves to determine the exact relationship between time of flight and concentration for your system.

    This application note (www.ti.com/.../snaa266a.pdf) has further transducer recommendations.

    Regards,