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A thin film thermocouple with a high accuracy was developed by means of computer analysis, which allowed measurements of instantaneous temperatures and heat fluxes on combustion chamber walls. Conventional Al-alloy and ceramic plates were compared in terms of the heat loss at the upper surface of each piston during combustion, using a gasoline engine and a diesel engine in the series of experiments. It was found by the comparison that the ceramic plates subjected to higher temperatures had greater heat losses in both the gasoline and diesel engines contrary to the anticipation.

The authors developed the optimum thin film thermocouples in terms of materials, shape and dimensions to make instantaneous surface temperature and heat flux measurements of combustion chamber wall in internal combustion engines with accuracy by the computer analysis. And they succeeded to make thin film thermocouple in ceramic piston, by the application of the above technique. Then, the instantaneous surface temperature was measured to obtained the instantaneous heat flux on the ceramic plate fixed on top of the piston.