Abstract
The dynamic functioning of the circular foil radiometer is analysed by the classical method: derivation of equations for the transient temperature distribution corresponding to a steady regime of functioning of the instrument and further use of the Duhamel theorem. The theoretical results lead to a sensitivity changing with the incident flux magnitude and permits the anticipation of the observation under definite conditions, of a reversal for the instrument thermoelectric e.m.f. They also give a basis for discussing the question of a correct interpretation with regard to registered experimental curves. Comparison with observations made on several circular foil radiometers having different sensitivities shows a qualitative and quantitative satisfactory agreement between theoretical results and experimental data.
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