Message Board Thread - "IR Window for HighTemperature?"

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IR Window for HighTemperature? mg 7/26/2007
What is the highest temperature that can be sustained by commercially available glass windows? 1000 C? 2000 C? 3000 C?

Thanks
 
Re:IR Window for HighTemperature? Bob Berry 7/30/2007
Saphire glass should be ok up to about 1500 C. It will only be tranmissive with a MWIR camera though. If you dont want to image through the window you could try Vycor.
 
Re:IR Window for HighTemperature? Laland 7/31/2007
Can you elaborate what is VYCOR. The IR window with 1500 degrees C is interesting or glass furnace application.
 
Re:IR Window for HighTemperature? glassman 8/2/2007
Laland wrote:
elaborate what is VYCOR. The IR window with 1500 degrees C is interesting or glass furnace application.
Hi. This is where it gets interseting yuo can obtain glas that with special coatings will have a in tack intergrity above 3000 c this is so special that cost out weights gain so you may be looking at an available glass that will be intergrialy safe at 2000c As for looking through with IR there are problems due to the coatings that are used to protect the glass. These are usuly of a bi metal mixtuer and as such make viewing unreliable. You should be able to do the busines at 1500c without problem
 
Re:IR Window for HighTemperature? mg 8/3/2007
That sounds good but...

What can I expect of the temperature value read through a saphire glass or Vycor? If the internal temperature is 1300C, I would probably read a lower value? Is this correct?

Would the variation between the temperature read and the internal temperature be linear on a range between 1000 and 1500?!



 
Re:IR Window for HighTemperature? Bob Berry 8/3/2007
As stated you will not be able to image through Vycor, you will see through it visually only. Saphire glass you will be able to image through with a MWIR camera.

"Would the variation between the temperature read and the internal temperature be linear on a range between 1000 and 1500?!" NO


When imaging through windows at this temperature level you will find some difficulties. Yes you are correct the measurement will be reduced by the window attenuation. The windows transmissivity may change with temperature, this will be non-linear also. You will have to compensate for the effects of the internal atmospheric temperature, this is the most difficult part.

What are you trying to look at/measure?
 


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