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OPT101 as simple pyrometer

Discussion in 'Electronic Design' started by scot, Sep 8, 2012.

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  1. scot

    scot Guest

    This is a newbie question so have at it. Is it possible to use a OPT101 photodiode w/ amplifier in a "simple" optical setup as a low cost pyrometer? This would not be for general use but a specialized application and I would do calibration for a specific material at a specific distance and a rangeof temperatures. By calibration I mean comparison with a thermocouple embedded in the material (temp range of ~600-1000 C). I don't have much experience in analog electronics so I would like to know how hard it would be toset this up and what to look out for. I should also mention I have an oldpyrometer housing with intact optics and a dichroic beam splitter which allows visible wavelengths to pass for sighting but IR reflected into a sensor (missing). Let me know if I am getting in over my head.
  2. Guest

    Isn't there such a thing as correlating a temperature of an object for working practical purposes ( such as flue gas ) with IR emissions over a small sub-band?
  3. Guest

  4. Scot

    Scot Guest

    Thanks Phil! I had not considered the problem with ambient light. It
    sounds like this OPT101 will not be appropriate for my application. I
    was also looking at a narrow band photodiode such as the ODD-95W from
    Optodiode Corp. but it sounds like that will have a similar issue of low
    signal. My personal experience with a Raytek single color pyrometer
    (which used a silicon photodiode) a couple years ago was that it would
    only register a signal above ~650 C and that was sighting into a
    graphite cavity which has an emissivity close to 1.

    I have considered the use of a thermopile or some kind of broadband
    radiation detector but wouldn't I have to use a lens transparent deep
    into the IR? Perhaps a CaF2 lens? I believe the lens in my pyrometer
    housing is BK7 or something similar which only transmits to ~2-3 micron.

    BTW, I love your book. I've only read bits and pieces but it is rare to
    find anything written from an experimentalist point of view these days.
    My background isn't optics but I still appreciate it.

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