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Some electronic devices have surface metallization with low emissivity that significantly reduces thermal emittance, decreasing temperature measurement sensitivity. For these cases, Optotherm offers emissivity coatings that can be applied using an airbrush and removed using a solvent. Optotherm also offers an emissivity coating kit that includes coating, solvent, airbrush and compressor.

Application results in a coating thickness of as thin as several microns, minimizing effects on device thermal behavior.  Resulting coating emissivity is approximately 0.50.

Devices can then be tested using lock-in thermography.

When accurate temperature measurement are required (such as for thermal resistance calculations or junction temperature estimation), devices are then placed on a thermal stage and heated to a stabilized temperature, for example 50°C.  An emissivity table is then created in Thermalyze to compensate for variations across the device surface.