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TMP006 and ambient air temperature

Stefano Costa
Prodigy 10 points
Other Parts Discussed in Thread: TMP006

Hello,

I'm asking myself if this component would be suitable for a situation where ambient air temperature (in an ordinary home or office room) must be measured, and the electronic board and sensor sits close to a heating element. Think of a TMP006 mounted on a PCB working at around 60 degrees, with an aperture toward the room.

  • 0
    TI__Expert 3370 points

    Hi Stefano,

    You are correct, thermal IR sensors can be used in this application. You may wish to consider the recently introduced TMP007 which includes a math engine. The TMP007 will automatically compensate for the local temperature around the PCB changing and calculate the temperature for you.

    As with thermal IR sensor, calibration will be required for the specifc system environment to account for local temperature range, field of view of the sensor and object properties. For guidance see the TMP007 Calibration Guide, SBOU142.

    There are two commmon set-ups used for this type of application depending on the desired intent. In the first option, a thin metal plate is used as the target and the plate is mounted to be thermally isolated from the rest of the system; plastic cases work well. The temperature of the plate will then be determined by the sir temperature of the room. Since the plate can be treated to have high emissivity (see calibration guide) and positioned to fill the sensor field of view, it is possibily to obtain excellent accuracy.

    The second option is to have the sensor stare at the room as a whole through a window or aperature. This will measure the average temp of the objects in the room as a whole; the accuracy will depend on how uniform the objects are in temperature and in thermal emissivity.

    Note that air itself is more difficult to measure directly though it does emit IR. For most use cases the air is transparent to IR and the IR radiation the sensor recieves is mostly determined by what is on the other side of the air - walls, chairs, people, etc.

    Regards,

    Werner Metz