Finding the temperture of the glass on an incandescent light bulb
Finding the temperture of the glass on an incandescent light bulb
(OP)
Hi,
I have a problem at work that is similar to estimating the temperture of the glass on an incandescent light bulb. The glass(quartz) is heated(P1) uniformly by some resistivity filament(T1=1700 deg-C) some distance away in vacuum, but cooled from the other side by natural convection, this(IR light bulb) is used to heat a sample material in the open air oven.
How would I estimate(rough) the temperture of the quartz? Quartz's emissivity is listed as 0.93, so seems I can apply the Stefan-Boltzmann Law P = ε’σ(T1^4-T2^4) to find the temperture of the glass(T2)? and how would I estimate how much heat(or temp) my sample will see from the Transmitted radiation? How would I account for the transmission of infrared radiation, Quart supposedly being very efficient for the transmission of infrared radiation in the some Short-wave infrared (SWIR) range?
I have a problem at work that is similar to estimating the temperture of the glass on an incandescent light bulb. The glass(quartz) is heated(P1) uniformly by some resistivity filament(T1=1700 deg-C) some distance away in vacuum, but cooled from the other side by natural convection, this(IR light bulb) is used to heat a sample material in the open air oven.
How would I estimate(rough) the temperture of the quartz? Quartz's emissivity is listed as 0.93, so seems I can apply the Stefan-Boltzmann Law P = ε’σ(T1^4-T2^4) to find the temperture of the glass(T2)? and how would I estimate how much heat(or temp) my sample will see from the Transmitted radiation? How would I account for the transmission of infrared radiation, Quart supposedly being very efficient for the transmission of infrared radiation in the some Short-wave infrared (SWIR) range?
RE: Finding the temperture of the glass on an incandescent light bulb
Complicating it is that the oven will radiate back from its operating temperature and the sample will be directly heated by radiation from the filament.
Edit: It occurs to me that few lamps are evacuated - that tends to allow the filament to evaporate and deposit on the envelope. Instead they use a halogen gas that chemically combines with the tungsten and only breaks down at high temps, allowing the metal to replate onto the filament and not onto the far too cold (relatively) envelope.
RE: Finding the temperture of the glass on an incandescent light bulb
TTFN (ta ta for now)
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RE: Finding the temperture of the glass on an incandescent light bulb
Did you consider a pyrometer or IR camera?
My 2 cents
Pierre
RE: Finding the temperture of the glass on an incandescent light bulb
RE: Finding the temperture of the glass on an incandescent light bulb
RE: Finding the temperture of the glass on an incandescent light bulb
RE: Finding the temperture of the glass on an incandescent light bulb
25W = 75F
40W = 115F
150W= 250F
https://www.ledsmaster.com/what-is-light-bulb-heat...
Spectrum analysis
--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."
RE: Finding the temperture of the glass on an incandescent light bulb
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: Finding the temperture of the glass on an incandescent light bulb