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actually, these two bodies were connected by seals. I would like to find out how these two parts are moving in order to figure out why there are seal problems. We can consider the steady state of thermal expansion. Thanks!

it is awesome. Any ball joint vendor uses this high temp grease? maybe have to ask them to try it.

Thanks! the optical system seems not ok for such high temp environment. The accuracy I need is less than 0.5mm.

Anyone has used a ball joint under high temperature environment? (about 1000F). The normal ball joint use lubricant which will vaporize under such high temp. Is there any self lubrciated ball joint availabe? Hope it can survive under such a high temp. Any suggestions?

Did anyone know if there is a clear or positive relationship between flame intensity fluctuation and combustion dynamics? or dynamics is only related to certain wavelength of the combustion flame such as UV, visible light, infred? How strong is the relationship? Thanks! Any thoughts?

I am trying to figure out what is the best way to measure the relative movement of two body. Here is the confguration: 1. the normal distance is about 20mm. 2. the relative movement can be +/- 10mm. 3. those two body are made of steel and their shape are irregular. 4. the temperature is about...