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Thermal version of Chroma-Key for TMP006 ?

Fausto Bastianello
Prodigy 15 points
Other Parts Discussed in Thread: TMP006

First of all, I'd like to espress my satisfaction for TMP006, I'm sure that it gives a great number of possibilities to developers.

My application require a fast measure of skin temperature with high sensibility on a small size of skin, (quite easy, isn't it? :-)

Thanks to all questions and answers posted before, I was impressed by the fact that die temperature is a reference for the measure; so I prototyped a shield for entire TMP006 breakout board with internally reflective aluminium foil that is heated to the Die Temperature with a PWM PID controller.

The shield have a window large as the chip.

(Another test may be driven using a Peltier Cooler to explore measure with Die Temperature below ambient temperature.)

Actually the measures are instable and I think it is caused by mechanical and thermal tolerance caused by manually prototyped parts.

I'd like to have your opinion about this approach. Is it a way to improve or discard ?

Thank you very much
Greetings from Italy
Fausto Bastianello fausto@amotion.it

  • 0
    TI__Expert 7945 points

    Hello Fausto,

    First of all my apologies for late response. I think there is a misunderstanding in the concept/working of TMP006 here. Die temperature is not used as a reference for measurements. Die temperature and thermometric voltage are used in calculating the Object temperature. You will be needing an additional temperature sensor (other than die temperaure) for reference measurements. I would suggest using an accurate reference temperature sensor for this, since you are trying to calibrate TMP006 for the skin. 

    Since human skin has high emissivity we use a black body reference to calibrate TMP006 for human skin temperature measurements.

    If you have any further questions please don't hesitate to email me directly (abhishekmuppiri@ti.com). Also if you can send me pictures of your setup, it would help me with my understanding.

     

    Best Regards,

    Abhi