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Thermography Emission

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    Thermography Emission

    Can someone help me with this one:

    An object that is a good reflector is also a:?

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  3. anderssok09 is offline Junior Member Pro Subscriber
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    Quote Originally Posted by jamescrosetto View Post
    Can someone help me with this one:

    An object that is a good reflector is also a:?
    Good emitter

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    Quote Originally Posted by anderssok09 View Post
    Good emitter
    According to the test, it is actually poor emitter.

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    Quote Originally Posted by bob152637485 View Post
    According to the test, it is actually poor emitter.
    High reflectivity equals low emissivity. I believe the test answer is correct.

    Source: ITC fundamentals of thermal science book.

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  9. SecondGen's Avatar
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    Quote Originally Posted by rofo42 View Post
    High reflectivity equals low emissivity. I believe the test answer is correct.

    Source: ITC fundamentals of thermal science book.
    Correct, highly reflective objects do not emit thermal radiation very well. They reflect infrared light just like visible light so you can easily get false readings, this is why a shiny lug can sometimes look hotter than cable insulation because you are seeing the reflection of other heat sources on the lug. The dull, non-reflective insulation is the more true reading. Bus bar is another good example if you've seen the difference in scanning insulated vs. non-insulated LV gear. You can often times see you own body heat if you stand directly in front of a shiny object you are inspecting. With that said, its still possible to see loose connections on shiny bus, it just takes some adjusting.

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