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Speed of TMP006 skin temperature measurement.

qingwen zhang
Prodigy 70 points
Other Parts Discussed in Thread: TMP006

Hi,

I'm using TMP006 to measure skin temperature; and I found that the time TMP006 get the stable temperature of the skin is VERY long, it may take more than two minutes.. Is there any measuring speed specification of this device in the datasheet? Thanks!

-Q.W

  • 0
    TI__Expert 7945 points

    Hello Q.W,

    Settling time depends in the distance of skin from the TMP006 and the physical setup itself. Are you using our EVM or dis you create your own board?

    Regards,

    Abhi

  • 0 in reply to Abhishek Muppiri
    Prodigy 70 points

    Hi Abhi,

    Thanks very much for your reply! I have made a mistake which caused the TOO long (more than 2 minutes..) settle time of TMP006; as I have placed a plastic mask on the TMP006, which stops the IR signal.

    Yet, I still have one question. As I measured the temperature with TMP006, I found the temperature results depends on the distance from sensor to object. When the distance is 4-5 mm, the temperature is the highest. As my application is to measure skin temperature, is there any suggestions for the distance from the sensor to the skin? Thanks!

    -- Q.W

  • 0 in reply to qingwen zhang
    TI__Expert 7945 points

    Hello Q.W,

    4-5mm is a good enough distance to measure skin temperature as long as it is exposed to the skin alone. Is TMP006 enclosed in some sought of a casing to restrict its filed of view?

    Also, what accuracies are you targeting?

    Best regards,

    Abhi

  • 0 in reply to Abhishek Muppiri
    Prodigy 70 points

    Hi Abhi,

    Thanks very much for your help! We are using TMP006 in wearable watch to measure skin temperature; and we plan to place a Fresnel lens between the object (skin) and TMP006, is it a appropriate way to improve the measuring accuracy and stability? Thanks!

     

    As for the measuring accuracy, we expect it to be in -0.5℃ to +0.5℃. Is it possible? Thanks!

     

    -- Q.W

  • 0 in reply to qingwen zhang
    TI__Expert 7945 points

    Hello Q.W

    Fresnel lens is a right approach to restrict the fild of view and increase the signal strength. We have obtained good results with Fresnel lens in the past but we haven't used it particularly for skin temperature. 

    With the right setup and distance close to skin, I think -0.5℃ to +0.5℃ is possible.

     

    Regards,

    Abhi