Infrared thermal imaging of flame?
Hermann Mannstein
wdd...@ibm.net, id, QQedmm14861;, Thu, EST, EST, EST wrote:
>
> I need to determine the temperature distribution of a propane flame and the
> substrate temp in a thin film coating process. The flame temp is about
> 1500C, the substrate is about 200 to 500C. We currently probe it with a
> thermocouple to get temps at a few points, but we would like a better idea
> of the spacial temperature distribution over 6 inch length of the flame. We
> think an infra red thermal imaging system might be a good way to accomplish
> this, but imaging a rather transparent thing like a flame would seem to be
> an unusual use for a thermal imaginer vs viewing a solid object. Determining
> the emissivity of the flame would seem to be a challenge as well.
>
cut.....
>
> Thanks for any advice,
>
> Doug Danielson
A broadband thermal IR image might be not enough information to retrieve
the temperature accurately. Collegues worked on a problem which is
close to yours with spectroscopic methods: Look at
http://www.op.dlr.de/ne-oe/ir/aerojet.html
-
Regards,
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Dr. Hermann Mannstein
/|
DLR-Institut fuer Physik der Atmosphaere / |
Oberpfaffenhofen ,---/--|---,
D-82234 Wessling / / / /
Germany '---|--/---'
| /
tel.: +49-8153-28-2503 |/ DLR
fax.: +49-8153-28-1841 '
mailto:Hermann....@dlr.de
http://www.op.dlr.de/ipa/ http://www.op.dlr.de/~pa64
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Bob Kane
Thermal imaging doesn't sound like a good idea; consult a source like
"Temperature Measurement in Engineering" by Baker, Ryder and Baker (vol 2) for
more appropriate techniques. The emissivity issue, dealing with
luminous/non-luminous flames, application of total radiation pyrometry, and
(probably best) spectroscopic techniques are all discussed. As for substrate T
measurement, a two-color system may work (and manage changes in emissivity) if
you can block reflected radiation from the flame and other heated parts, and
deal with a number of other issues as well. Find a good consultant before
throwing too much money at this.
R. H. Kane
Philips Research USA
Usual disclaimer...
wdd...@ibm.net, id, QQedmm14861;, Thu, EST, EST, EST wrote:
> I need to determine the temperature distribution of a propane flame and the
> substrate temp in a thin film coating process. The flame temp is about
> 1500C, the substrate is about 200 to 500C. We currently probe it with a
> thermocouple to get temps at a few points, but we would like a better idea
> of the spacial temperature distribution over 6 inch length of the flame. We
> think an infra red thermal imaging system might be a good way to accomplish
> .........snip...........
gary.mi...@gmail.com
I can probably get you a white paper report on this. Contact Gary at united
infrared .com. Also, visit:
http://www.infraredcamerawaterleakdetectionservices.com