Radiant energy – Photocells; circuits and apparatus – Flame light source
Patent
1990-12-13
1992-11-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Flame light source
25022723, 250226, 340578, G01J 300, G08B 1712
Patent
active
051646005
ABSTRACT:
A light off detecting arrangement for sensing the presence of a flame in a region such as the afterburner of a turbine engine is disclosed. An optical focusing device such as a lens or mirror is located near a quartz window adjacent the afterburner for concentrating electromagnetic radiation emanating from the region. An optical (fiber optic) pathway receives the concentrated electromagnetic radiation from the optical focusing device and conveys that radiation thru the optic filters to an opto-electrical converter for converting incident electromagnetic radiation to electrical signals. A frequency selective optical device such as an infrared filter is interposed between the optical focusing device and the opto-electrical converter for insuring that a preselected portion only of the electromagnetic radiation emanating from the region is converted to electrical signals. The electrical signals are compared to a predetermined threshold value and a fault flame present indication is issued if the comparison indicates sufficient radiation in the preselected portion indicative of the presence of a flame, and a second no flame indication is issued otherwise.
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Das Promit
Kinney Terrance R.
Allied-Signal Inc.
McCormick Jr. Leo H.
Messinger Michael
Nelms David C.
Palguta Larry J.
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