Article du Bulletin
A heart rate and body temperature biotelemetry system for use with free-ranging vertebrate [Système de biotélémétrie du rythme cardiaque et de la température corporelle utilisable chez les animaux sauvages].
Pauley J.D. & Shirer H.W. · 1971 · Proceedings of the 24th annual conference on engineering in medicine and biology, 1972. Alliance for Engng. in Medicine and Biology, Washington, DC, USA, 314.
Résumé
A biotelemetry system has been developed to study energy budgeting in free-ranging vertebrates such as the opposum, raccoon, or marmot. Heart rate and body temperature are monitored as indices of metabolic rate and stored thermal energy. Free-ranging animals pose special problems. A biotelemetry system for use with them requires that the transmitter have a life of at least six weeks, a range of at least 100 m, and be small and implantable. For maximum versatility, both portable and fixed- location receiving equipment must be provided. It is shown that pulse duration modulation possesses significant advantages over the more commonly used frequency modulation, both in the signal strength required at the receiver for reliable detection and in signal-to-noise ratio improvement. Thus it is possible to obtain a greater life-range product for a given power consumption, using pulse modulation rather than frequency modulation.