Abstract
A simple model of a heat fluxmeter is developed and it is shown that the frequency-response is essentially different from that of a classical lumped R-C network. The high-frequency asymptotic slope of the Bode-plot is only -3 dB/oct and the phase shift is maximum 45 degrees . The relationships between the frequency-response, the step-response and the thermal resistivity and capacity are deduced. The frequency-response is measured using a binary random modulated radiation and a digital fourier-analyser; the influence of the contact resistance on the frequency-response is studied.