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TDC1000-C2000EVM: Sensors forum

Devika Raju
Prodigy 100 points
Part Number: TDC1000-C2000EVM
Other Parts Discussed in Thread: TDC1000

Hi All,

I am working with TDC1000_c2000EVM software and I am using STEMINC 1MHZ ultrasonic transducer. The transducer is mounted inside the small piece of steel with cyanoacrylate glue and mounted the steel on the top of the plastic container.

here is the problem

1. I am trying to measure the distance from the top. When I measure TOF with an empty (Air) condition, I got some values. On trying with some material inside the Jar, the TOF value is random. In some cases the TOF value displayed is that of empty. I am not getting TOF value corresponding to that of material. The readings are varying from time to time.

This is my configurations  

2. In oscilloscope, the time between the start and stop pulse is always 30-40us but in TDC1000_c2000evm software TOF value is around 550us when I enabled blanking the time is 30us+blanking period time.

Please review and share your suggestions.

  • 0
    TI__Expert 7599 points

    Hello,

    We will review your request and get back to you. We should be reaching out to you next week. Meanwhile can you please reachout to STEMINC and ensure that the placement and the glue settings of the transducer is properly attached and mounted. Several times if the transducer is improperly attached the readings could get erratic. 

    Can you please help us understand what is the material inside a jar that is being tested ? Does it make any difference if the material is filled in the container vs no material.  

  • 0 in reply to Arjun_Prakash
    Prodigy 100 points

    Hi Arjun,

    Thanks for your reply.

    The transducer is mounted properly with cyanoacrylate glue.

    I tested with Rice and sugar, There is no difference in the TOF value for the rice, sugar and empty(no material).

  • 0 in reply to Devika Raju
    TI__Expert 7599 points

    Hi,

    Thanks for clarifying the material.

    The 1Mhz transducer is typically meant for liquid sensing applications. For actual object or target applications I highly recommend a lower frequency transducers. I recommend reaching out to the transducer manufacturer and get guidance on the material selection for measuring different objects. Usually for high frequency transducers its meant for liquid coupled applications. As far as the settings are concerned I dont see any issues with the settings as per your screen shot. 

    Here is the app note that discusses the transducer frequency http://www.ti.com/lit/an/slaa907a/slaa907a.pdf figure 11 specifically talks about the transducer selection for variations applications. For detecting materials in air a 400Khz or lower is highly recommended. 

    Please do refer to our ultrasonic FAQ for more information