Mechanical temperature sensors
editElectrical temperature sensors
edit- 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
editThe 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][5]: §6.1 which has also included an ad-hoc method of automatically scanning the I2C bus by default during system boot since 2006 as well.[6][5]: §5
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.[5]: §7.1
Remote uncooled IR thermal radiometer sensors are also commonly used in integrated circuits.[9]
See also
editReferences
edit- ^ Webster, John G. (1999). The measurement, instrumentation, and sensors handbook. Boca Raton, Florida: CRC Press. p. 32. ISBN 9783540648307.
- ^ Houdas, Y; Ring, E.F.J. (2013). Human body temperature : its measurement and regulation. New York: Springer US. p. 39. ISBN 9781489903457.
- ^ Constantine A. Murenin (2007-04-17). Generalised Interfacing with Microprocessor System Hardware Monitors. Proceedings of 2007 IEEE International Conference on Networking, Sensing and Control, 15–17 April 2007. (PDF). London, United Kingdom: IEEE. pp. 901–906. doi:10.1109/ICNSC.2007.372901. ISBN 978-1-4244-1076-7. IEEE ICNSC 2007, pp. 901—906.
- ^ Ingrid Marson (2006-03-24). "OpenBSD 3.9 adds sensor framework". ZDNet.
- ^ a b c Constantine A. Murenin (2010-05-21). OpenBSD Hardware Sensors — Environmental Monitoring and Fan Control (MMath thesis). University of Waterloo: UWSpace. hdl:10012/5234. Document ID: ab71498b6b1a60ff817b29d56997a418.
- ^ Theo de Raadt (2015-05-29). "/sys/dev/i2c/i2c_scan.c". BSD Cross Reference. OpenBSD.
- ^ "dev/i2c/". BSD Cross Reference. NetBSD.
- ^ "arch/macppc/conf/GENERIC". BSD Cross Reference. NetBSD.
dbcool* at iic? #...
- ^ Avraham, M.; Nemirovsky, J.; Blank, T.; Golan, G.; Nemirovsky, Y. (2022). "Toward an Accurate IR Remote Sensing of Body Temperature Radiometer Based on a Novel IR Sensing System Dubbed Digital TMOS". Micromachines. 13 (5): 703. doi:10.3390/mi13050703. PMC 9145132. PMID 35630174.