Title :
Tunnel diode oscillator applied as sensor-modulator for telemetry of temperature in human beings and animals
Author :
Villamar, L.A. ; Suaste, E.
Author_Institution :
Departamento de Ingenieria Electrica, CINVESTAV, Mexico City, Mexico
Abstract :
The purpose of this study was to use the tunnel diode in order to evaluate objectively the temperature in human beings and animals based on the region of negative resistance of the tunnel diode, we have designed and developed a relaxation tunnel diode oscillator circuit (astable) that acts as sensor and modulator of its oscillation frequency. The modulated signal corresponding to the temperature is transmitted by radio telemetry in FM. The prove of the system was carried out in animal test (rat), where the tunnel diode (sensor-modulator) was implanted. The range of temperature of the tunnel diode as a sensor of temperature was characterized of 0 °C to 50 °C with a resolution of 0.03 °C and an accuracy of ±0.1 °C. Additionally, measurements of temperature of the human skin using the same tunnel diode were obtained.
Keywords :
biological techniques; biomedical telemetry; biosensors; biothermics; frequency modulation; prosthetics; radiotelemetry; skin; temperature sensors; tunnel diode oscillators; 0 to 50 C; animal test; human being; human skin; negative resistance; oscillation frequency; radio telemetry; relaxation tunnel diode oscillator; sensor-modulator; telemetry system; temperature sensor; Animals; Diodes; Frequency modulation; Humans; Immune system; Oscillators; Telemetry; Temperature distribution; Temperature measurement; Temperature sensors;
Conference_Titel :
Engineering in Medicine and Biology Society, 2003. Proceedings of the 25th Annual International Conference of the IEEE
Print_ISBN :
0-7803-7789-3
DOI :
10.1109/IEMBS.2003.1280781
