A method for spark rejection in ultraviolet flame detectors
Pauchard, A.R.
Manic, D.
Flanagan, A.
Besse, P.A.
Popovic, R.S.
Inst. of Microsyst., Swiss Fed. Inst. of Technol., Lausanne;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Feb 2000
Volume: 47,
Issue: 1
On page(s): 168-174
ISSN: 0278-0046
References Cited: 7
CODEN: ITIED6
INSPEC Accession Number: 6507845
Digital Object Identifier: 10.1109/41.824139
Current Version Published: 2002-08-06
Abstract
A novel method is presented to render ultraviolet (UV) flame
detectors insensitive to ignition spark radiation. The method involves
isolating the signal due to the sparks from the UV sensor output and
subtracting a DC signal proportional to it from the output of the flame
detector sensor system. A practical demonstration of the method is given
using a commercially available UV flame detector with the addition of an
analog circuit to perform the necessary signal processing. A selectivity
improvement to spark radiation of greater than 130 has been obtained.
The method is robust in that it is independent of the distance between
the light source and the flame detector and has been designed to work
with different spark generators found on the market. The analog circuit
is simple, requiring few components, thus ensuring rugged, fail-safe
operation and low cost
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