Thermistor For Body Temperature Measurement

It could be used for human body temperatures but it depends on how you want to measure the body temperature.

Thermistor for body temperature measurement.

However ptc thermistors have a sort of tipping point and greatly change the resistance at some temperature. Temperature the component must not be immersed in water but in suitable liquids e g. This makes the ptc thermistor a little harder to interface with. The temperature measurement of the surface of the body can be accomplished using different sensor technologies.

The silicone oil provides a very uniform temperature so many devices can be calibrated in a single cycle. Temple and forehead type thermometers use the same technology to measure infrared radiation as ear type thermometers they just measure it from a different location on the body. It is relatively easy to calibrate your own response curves if you have an accurate temperature measurement standard. Convert the temperature values to kelvins and invert.

Te connectivity te manufactures ntc negative thermal coefficient thermistors thermopiles and digital temperature sensors to support the wide range of accuracy packaging and performance conditions amongst the different. Measurement purposes checking the specified resistance vs. Types of sensors like ntc negative thermal coefficient thermistors thermopiles and digital temperature sensors. Perfluoropolyethers such as galden.

The typical operating temperature range of a thermistor is 55 c to 150 c though some glass body thermistors have a maximal operating temperature of 300 c. The thermistor measures the cold junction temperature of the thermopile and both the thermopile and thermistor measurements are used to calculate the body temperature. Thermistors differ from resistance temperature detectors rtds in that the material used in a thermistor is generally a ceramic or polymer while rtds use pure metals. Thermistor linearization curves.

The temperature measurement of the surface of the body can be accomplished using different sensors. Take the corresponding measured resistance values and compute the natural logarithm. For this reason for most low cost temperature measurement ntc thermistors are preferred. The thermistor used in this article is mainly used for sensing environmental temperatures.

Since the human skin acts as a thermal insulator the temperature of the skin isn t an accurate representation of actual body temperature. The adt7422 has an accuracy of 0 1 c over a temperature range of 25 c to 50 c.