Thin filament pyrometry (TFP) is an optical method used to measure temperatures. It involves the placement of a thin filament in a hot gas stream. Radiative emissions from the filament can be correlated with filament temperature. Filaments are typically
silicon carbide (
SiC) fibers with a diameter of 15 micrometres. Temperatures of about 800–2500 K can be measured.
History
TFP was first used by V. Vilimpoc and L.P. Goss (1988). A recent paper using TFP is Maun et al. (2007).
Technique
The typical TFP apparatus consists of a
flame or other hot gas stream, a filament, and a camera.
Advantages
TFP has several advantages, including the ability to simultaneously measure temperatures along a line and minimal intrusiveness. Most other forms of
pyrometry
A pyrometer is a type of remote-sensing thermometer used to measure the temperature of distant objects. Various forms of pyrometers have historically existed. In the modern usage, it is a device that from a distance determines the temperature of ...
are not capable of providing gas-phase temperatures.
Drawbacks
Calibration is required. Calibration typically is performed with a
thermocouple. Both thermocouples and filaments require corrections in estimating gas temperatures from probe temperatures. Also, filaments are fragile and typically break after about an hour in a flame.
Applications
The primary application is to
combustion and
fire research.
See also
*
ASTM Subcommittee E20.02 on Radiation Thermometry ASTM Subcommittee E20.02 on Radiation Thermometry is a subcommittee of the ASTM Committee E20 on Temperature Measurement, a committee of ASTM International. The subcommittee is responsible for standards relating to radiation or infrared (IR) temp ...
References
* L.G. Blevins, M.W. Renfro, K.H. Lyle, N.M. Laurendeau, J.P. Gore
Experimental study of temperature and CH radical location in partially premixed CH4/air coflow flames Combustion and Flame 118 (4) 684-696 (1999).
* J.D. Maun
Thin-Filament Pyrometry With a Digital Still Camera{dead link, date=January 2018 , bot=InternetArchiveBot , fix-attempted=yes , M.S. Thesis, University of Maryland (2006).
* J.D. Maun,
Peter B. Sunderland Peter B. Sunderland is Professor of Fire Protection Engineering and Keystone Professor at the University of Maryland, College Park. He earned a Bachelor's Degree in mechanical engineering at Cornell University, a Master's Degree in mechanical engine ...
, D.L. Urban, Applied Optics, 46:483-488 (2007).
* W.M. Pitts, Proceedings of the Combustion Institute 26:1171-1179 (1996).
* V. Vilimpoc, L.P. Goss, Proceedings of the Combustion Institute 22:1907-1914 (1988).
Combustion
Measurement
Radiometry