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TMP117: i was searching for a solution to make an IR thermometer

Mohit Bhartiya
Prodigy 40 points
Part Number: TMP117

i came across this article which mentions the use TMP117.

can you suggest how the pcb be designed for this application ?

are there any parameters to be considered ?

also will this sensor work accurately in ambient temperature of 0C to 50 C ?

e2e.ti.com/.../how-to-design-an-infrared-thermometer-quickly

  • 0
    TI__Mastermind 28070 points

    Hi Mohit,

    Thank you for your question. The TMP117 is a contact temperature sensor, so it will sense temperature primarily based on thermal conduction or convection. It is not an infrared temperature sensor so it would not be suitable as the primary sensing element for an infrared thermometer. There isn't a board design that i know of that would change this. 

    The article doesn't describe what role the TMP117 would be playing in a infrared thermometer system, but they may be using it to measure board or ambient temperature. 

    Mohit Bhartiya said:
    also will this sensor work accurately in ambient temperature of 0C to 50 C ?

    Yes, the TMP117 in all variants will work well in this range. For ambient temperature measurements its best to follow the guidelines in Layout Considerations for Ambient Temperature Sensing. 

    Please let me know if you have any other questions. 

    Best Regards,
    Brandon Fisher

  • 0 in reply to Brandon Fisher94
    Prodigy 40 points

    Hi Brandon,

    Thank you for the reply.

    this ambiguity is not appreciated.

    an IR temperature sensor doesn't require a separate temperature sensor.

  • 0 in reply to Mohit Bhartiya
    TI__Mastermind 28070 points

    Hi Mohit,

    I agree it is ambiguous in its description.

    The only use i can think of for a local temperature sensor like the TMP117 on an infrared system would be for ambient temperature compensation. A lot of infrared sensors will have their readings drift based on ambient temperature. Whether or not this would be useful would depend on the system design requirements and the specific IR sensor. 

    Best Regards,
    Brandon Fisher

  • 0 in reply to Brandon Fisher94
    Prodigy 40 points

    Hi Brandon,

    Thermopile ir sensors have an ir sensor and a thermistor.

    Thermistor is for measuring ambient temperature.

    A temperature difference obtained is displayed.

    there is no use of an external temperature sensor.

    make amend to your article. its misleading.

                              

  • 0 in reply to Mohit Bhartiya
    TI__Guru* 91206 points

    Mohit - 

    We will pass that on to the author. Thanks!