Thin filament pyrometry

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.

TFP image in diluted methane flame. Filament spacing is about 10 mm.

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 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.

gollark: PotatOS is still widely used.

gollark: This policy supersedes any applicable federal, national, state, and local laws, regulations and ordinances, policies, international treaties, legal agreements, illegal agreements, or any other agreements that would otherwise apply. If any provision of this policy is found by a court (or other entity) to be unenforceable, it nevertheless remains in force. This organization is not liable and this agreement shall not be construed. We are not responsible for any issue whatsoever at all arising from use of CC-INF, this product, anything at all, or otherwise.

gollark: It is in fact impossible for you to know about them in any more detail than that.

gollark: Certain classified GTech™ projects use CC-ε₀.

gollark: Obviously the best way is to take MIT and add a "tell me if my software becomes embedded in secretish hardware backdoors in CPUs" clause.

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, M.S. Thesis, University of Maryland (2006).
J.D. Maun, Peter B. Sunderland, 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).

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.