I'm going to measure the thermal conductivity with an infrared camera. I put the sample on the heating element. The remaining part of the heater is thermally insulated. Thermal image of the sample gives us the average temperature of the sample. Power consumed by the heater is equal to the heat flux flowing through the sample. Knowing the temperature on both sides of the sample thermal conductivity can be calculated.
I ask for suggestions
In case you propose, you are not sure that all energy pass through your sample and the assessment of conductivity is possible only if you are on steady transfer. It's not possible in-situ.
infrared camera is not the best equipment to do that. To get results, you have to check emissivity for full range of temperature for your material. Better ideas is more simple thermocouple and contact measurements on both sides in steady state condition.
Why don't you use just a heat flow sensor (it consist on a set of thermocouples connected in series and looks very much like a strain gauge).?
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Usage of iR camera make sense in three cases:
1. if you are interested in the field (surface measurements)
2. if you have no physical access to the measurement area
3. if a temperature is very high
Probably in your case a contact, point, steady-state measurement is enough. Even if you don't want to use contact probe, instead of IR camera the pyrometer is enough (but again, check emissivity).
The problem is that I want to measure the thermal conductivity of the paint sediments. The samples are very fragile and their thickness is varied. Previously I measured the average thickness of the sample and placed in lambda meter - see my other question https://www.researchgate.net/file.PostFileLoader.html?id=516e7215d039b10d77000008&key=72e7e516e7215e129d
but it seems to me that it is easier to measure the average temperature of the surface by an infrared camera. Perhaps on the basis of the temperature distribution a thickness variation of the sample can be determined.
OK, so don't forget to calibrate IR cam measurement by checking the emissivity of measured surface in a known constant temperature.
The problem is that we do not know any characteristics of these deposits. Until today I could not find any publications about the properties of paint sediments. I think it would be an interesting research project.
Infrared Technology for lower emissivity ranges may not provide accurate results rather than thermocouples
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