List of temperature sensors explained

Mechanical temperature sensors

• Thermometer
• Bimetallic strip

Electrical temperature sensors

• Thermistor- Thermistors are thermally sensitive resistors whose prime function is to exhibit a large, predictable and precise change in electrical resistance when subjected to a corresponding change in body temperature.^[1] Negative Temperature Coefficient (NTC) thermistors exhibit a decrease in electrical resistance when subjected to an increase in body temperature and Positive Temperature Coefficient (PTC) thermistors exhibit an increase in electrical resistance when subjected to an increase in body temperature.^[2]
• Thermocouple
• Resistance thermometer
• Silicon bandgap temperature sensor

Integrated circuit sensors

The integrated circuit sensor may come in a variety of interfaces — analogue or digital; for digital, these could be Serial Peripheral Interface, SMBus/I²C or 1-Wire.

In OpenBSD, many of the I²C temperature sensors from the below list have been supported and are accessible through the generalised hardware sensors framework^[3] since OpenBSD 3.9 (2006),^[4] which has also included an ad-hoc method of automatically scanning the I²C bus by default during system boot since 2006 as well.^{[5] [6]}

In NetBSD, many of these I²C sensors are also supported and are accessible through the envsys framework,^[7] although none are enabled by default outside of Open Firmware architectures like macppc,^[8] and a manual configuration is required before first use on i386 or amd64.

Remote uncooled IR thermal radiometer sensors are also commonly used in integrated circuits.^[9]

See also

• Celsius, Fahrenheit, Kelvin
• Conversion of units of temperature
• List of LM-series integrated circuits
• Temperature measurement

Notes and References

1. Book: Webster . John G. . The measurement, instrumentation, and sensors handbook . 1999 . CRC Press . Boca Raton, Florida . 9783540648307 . 32.
2. Book: Houdas . Y . Ring . E.F.J. . Human body temperature : its measurement and regulation . 2013 . Springer US . New York . 9781489903457 . 39.
3. Constantine A. Murenin . 2007-04-17. Generalised Interfacing with Microprocessor System Hardware Monitors. https://web.archive.org/web/20070806092541/http://www.ieee-icnsc07.org/ICNSC07-Program.pdf. Proceedings of 2007 IEEE International Conference on Networking, Sensing and Control, 15–17 April 2007.. London, United Kingdom. IEEE. 901–906 . 10.1109/ICNSC.2007.372901 . 978-1-4244-1076-7. IEEE ICNSC 2007, pp. 901—906..
4. Web site: Ingrid Marson . 2006-03-24. OpenBSD 3.9 adds sensor framework. ZDNet.
5. Web site: Theo de Raadt. Theo de Raadt. 2015-05-29. /sys/dev/i2c/i2c_scan.c. BSD Cross Reference . OpenBSD.
6. MMath. Constantine A. Murenin . 2010-05-21. OpenBSD Hardware Sensors — Environmental Monitoring and Fan Control.. . UWSpace. 10012/5234. Document ID: ab71498b6b1a60ff817b29d56997a418..
7. Web site: dev/i2c/ . BSD Cross Reference . .
8. Web site: arch/macppc/conf/GENERIC . BSD Cross Reference . . "dbcool* at iic? #..." .
9. Micromachines. 2022. M.. Avraham. J.. Nemirovsky. T.. Blank. G.. Golan. Y.. Nemirovsky. Toward an Accurate IR Remote Sensing of Body Temperature Radiometer Based on a Novel IR Sensing System Dubbed Digital TMOS. 13. 5. 703 . 10.3390/mi13050703. 35630174 . 9145132 . free.