Vaginal temperature sensing using UHF radio telemetry

Z. McCreesh, N.E. Evans, William Scanlon

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


User induced errors are common when women repetitively employ conventional probe type thermometers to chart their basal body temperatures in an effort to indicate ovulation. An alternative technique employing a two-part telemetric thermometer is proposed, with low-power, SAWR-controlled UHF radio as the transmission medium. Worn overnight in the vagina, the 1 mu W erp telemetry transmitter sends pulse modulated data continuously to a microcontroller in a nearby receiver; a real time clock enables programmable sampling and storage of the subject's temperature to 0.1 degrees C resolution. Initial clinical results indicate an enhanced performance compared to oral and axillary temperature trends taken by a mercury-in-glass thermometer. Polar plots of both the isolated and body-worn telemetry transmitte are presented; body indced attenuations of up to 30 dB were measured.
Original languageEnglish
Pages (from-to)110-114
Number of pages5
JournalMedical Engineering and Physics
Volume18 (2)
Publication statusPublished - Mar 1996


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