A new application of a thin-film resistance temperature detector is presented. Such a sensor is built into a prototype drive unit where it is used to measure the temperature rise of the voice coil excited by a multitone signal, and the results are compared by way of the pilot tone method. A sensor is made using 18-μm–thick rolled annealed copper, equivalent to that used in flexible printed circuit boards. The sensor is then used in an experiment to assess the influence of the thermal conductivity of the surrounding medium on the voice coil temperature, by performing the thermal measurements inside a volume of helium. The accuracy of the results is discussed and compared with the requirements of an application for loudspeaker drive units.
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https://aes2.org/publications/elibrary-page/?id=22712
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