Fire and ambient IR

  • Thread starter aruna1
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hello
can someone tell me are ambient IR and IR in candle fire has different wave lengths?
I'm trying to make a flame detector,so if there is different wave lengths i can use a filter circuit to filter only fire's IR signal.
Thanks
 

Mapes

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I think your best bet is to look at wavelengths around 1-2 um. According to Incropera and DeWitt's Fundamentals of Heat and Mass Transfer there's very little emission under 2 um for bodies at 300 K.
 
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I think your best bet is to look at wavelengths around 1-2 um. According to Incropera and DeWitt's Fundamentals of Heat and Mass Transfer there's very little emission under 2 um for bodies at 300 K.
well sir does candel fire emits IR around 1-2um? I'm not familier with physics laws you mentioned.
 

Mapes

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All materials emit all wavelengths, but there's a characteristic peak that's a function of temperature alone. For room temperature objects, it looks like the peak is around 10 um. For a candle flame, 1-4 um.
 

uart

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well sir does candel fire emits IR around 1-2um? I'm not familier with physics laws you mentioned.
Yes, with a typical candle color temperature of about 2000k, by my calculations 2um should be reasonably close to the peak wavelength emitted.
 
111
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All materials emit all wavelengths, but there's a characteristic peak that's a function of temperature alone. For room temperature objects, it looks like the peak is around 10 um. For a candle flame, 1-4 um.
Yes, with a typical candle color temperature of about 2000k, by my calculations 2um should be reasonably close to the peak wavelength emitted.
thankyou very much both of you sirs:smile:
 

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