Fire & Ambient IR: Is there a Difference?

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Ambient infrared (IR) and IR emitted from candle flames have different wavelength characteristics, with candle flames emitting primarily in the range of 1-4 micrometers (µm). For a candle flame, the peak wavelength is around 2 µm, which corresponds to a typical color temperature of about 2000K. In contrast, room temperature objects emit peak IR around 10 µm. Understanding these differences is crucial for designing effective flame detection systems using filter circuits. Accurate wavelength filtering can enhance the sensitivity of flame detectors.
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
 
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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.
 
Mapes said:
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.
 
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.
 
aruna1 said:
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.
 
Mapes said:
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 said:
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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