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TMP006 accuracy at a distance

TMP006 accuracy at a distance

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Donald Bradley
Posted by
on Jul 25 2012 18:14 PM
Prodigy10 points

Assuming a restricted field of view apparatus is placed over a TMP006 creating an optical field of view of 6:1 (distance/spot size), will the TMP006 still show accurate results. If not would a Fresnel lens work ?

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  • Ian Williams
    Posted by
    on Jul 26 2012 14:07 PM
    Verified Answer
    Verified by
    Genius14235 points

    Hello Donald,

    This will work, however the following considerations must be met when implementing a restricted field of view apparatus:

    1. A calibration of S0 will likely be required, since the restricted field of view means less signal will enter the TMP006 sensor. The default S0 value of 6E-14 is intended to be used with an uncovered TMP006. See the TMP006 User's Guide section 6 for more details.
    2. For best results, the apparatus should be a polished, shiny metal object with a low emissivity (such as aluminum, brass, copper, nickel, steel, etc.). This is to prevent the temperature of the apparatus from impacting the object temperature measurement, since the apparatus made of this type of material will radiate an insignificant amount of IR energy.
    3. The PCB layout should be such that the apparatus can be soldered or clipped to the GND plane, which should be electrically and thermally coupled to the GND pin of the TMP006. This is to ensure that no offsets are caused by the apparatus being at a different temperature than the GND plane/TMP006 die.

    By the way, I am in the process of writing an application report on this topic. It should be complete in the next 6-8 weeks or so.

    Best regards,

    Ian Williams
    Linear Applications Engineer
    High Performance Linear and Sensing Products 


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