NASA NTRS · 19870000445
Implantable, Ingestible Electronic Thermometer
Abstract
Small quartz-crystal-controlled oscillator swallowed or surgically implanted provides continuous monitoring of patient's internal temperature. Receiver placed near patient measures oscillator frequency, and temperature inferred from previously determined variation of frequency with temperature. Frequency of crystal-controlled oscillator varies with temperature. Circuit made very small and implanted or ingested to measure internal body temperature.
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Kleinberg, Leonard. 1987-10-01. Implantable, Ingestible Electronic Thermometer. https://ntrs.nasa.gov/citations/19870000445
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