Abstract

Perturbation equations describing the response of hot wires and hot films operating in a simple constant temperature circuit are developed. The heat transfer model shows that at low frequencies (a( omega /Ks)12/<or=1, where omega is the perturbation frequency and a and Ks are the substrate radius and thermal diffusivity respectively) the hot film responds like a hot wire. At high frequencies (a( omega /Ks)12/>>1) the hot film rolls off at 30 dB/decade. Experimental measurements of the circuit frequency response to a voltage perturbation for both a hot film and a hot wire show good agreement with theory if the calculations use the measured probe time constants, and when thermal end losses are taken into account.

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