Thermistors Turgut Kurtulu BYM 501 E FUNDAMENTALS OF

Thermistors Turgut Kurtuluş BYM 501 E FUNDAMENTALS OF BIOMEDICAL ENGINEERING

THERMISTORS THERMal res. ISTORS • A resistor whose resistance changes with temperature How is made ? • Semiconductor Materials : Tpically oxides of *Manganese *Cobalt *Nikel *Copper *Iron *Uranium

Which termistor shapes are available?

What are the types of Thermistors? NEGATIVE TEMPERATURE COEFFICIENT(NTC) POSITIVE TEMPERATURE COEFFICIENT(PTC)

Applications NEGATIVE TEMPERATURE COEFFICIENT(NTC) • NTC thermistor is mainly applied in inrush current suppressing limiting, temperature sensing measurement, temperature compensation, temperature control, etc. POSITIVE TEMPERATURE COEFFICIENT(PTC) • PTC thermistor is mainly applied in over-current overload and short circuit protection, telecom protection, lighting soft switching time delay, motor starting, temperature sensing & protection, self-regulation heating, etc.

Principle of Operation simply use R/T calculation tool on the net.

Linearization circuits for thermistors

The circuitry used for thermistor read-out

REFERENCES • Medical Instrumentation Application and Design, John G. Webster • Introduction to Biomedical Enginering, J. Enderle, J. Bronzino • Electrical Engineerin Materials, T. K. Basak • Principles of Medical Electronics and Biomedical Instrumentation, C. R. Rao, • S. K. Guha • Biomedical Sensors, Deric p. Jones • A linearization Scheme fot Thermistor-Based Sensing in Biomedical Studies, IEEE Sensor Journal, Vol. 16, No: 3 • • Link: http: //www. circuitstoday. com/thermistors-working -types-applications Link: https: //www. teamwavelength. com/thermistorbasics/ • Link: https: //instrumentationtools. com/thermistorworking-principle/ Frontiers in Biosensorics II, F. W. Scheller, F. Schubert, J. Fedrowitz • Link: https: //en. wikipedia. org/wiki/Thermistor • Sensors in Biomedical Applications, G. Harsanyi • • Applied Materials Science, Deborah D. L. Chung https: //www. littelfuse. com/technicalresources/technical-centers/temperaturesensors/thermistor-info/ • Biomedical Sensors And Instruments, T. Togawa, T. Tamura, P. A. Oberg • PTC Thermistors General Technical Information, TDK Electronics • • NTC Thermistors General Technical Information, TDK Electronics Link: https: //www. electronicsnotes. com/articles/electronic_components/resistors/th ermistor-technology-types. php • SMD NTC Thermistors General Technical Information, TDK Electronics • Guide on Secondary Thermometry, International Committee for Weights and Measures • NTC Thermistor Theory, Beta. Term Sensors Temperature Solutions • NTC Thermistors, Bowthorpe Thermmetrics, Thermometrisc Inc. , Keystone Thermometrics Corpation