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US 4,736,105 AGranted
Flame detector system
AssigneeTri-Star Research, Inc.
InventorElmer M. Fonnesbeck
Life of this patent
Estimating the term…
Abstract
An ultraviolet type flame detection system utilizes an UV detector for producing pulses from flame produced UV photons. A logic and clock circuit defines a sequence of windows. A counter is advanced by the clock and reset if no detector pulse occurs in a window. If detector pulses occur in each of a preselected sequence of windows, the logic circuit enables an alarm. When detector pulses cease, the logic circuit resets the system.
Claims11
A flame detection device comprising:
- a detector for producing electrical first pulses from photons of ultraviolet radiation;
- logic circuit means for producing a sequence of logic pulses, said logic pulses defining sequential detection windows having a length greater than the length of said first pulses;
- counting means connected to said logic circuit means and said detector for producing a count for each of said windows in which at least on of said first pulse occurs, said counting means producing an alarm output signal only when said first pulses occur sequentially in a preselected number of sequential windows;
- and
- reset means for resetting said counting means when no first pulse occurs in one of said windows.
2 more elements
A flame detection system comprising:
- (a) a detector for producing short electrical pulses responsive to photons of electromagnetic radiation emanating from a flame;
- (b) first logic circuit means connected to said detector for
- (i) generating a sequence of long electrical pulses defining a sequence of logic windows, and
- (ii) detecting the presence of said short electrical pulses occurring within periods of said logic windows;
- (c) counting circuit means for
- (i) producing a count at the beginning of each of said logic windows,
- (ii) resetting said count if at least one short electrical pulse is not detected within a period of said logic window, and
- (iii) producing an alarm signal when a preselected sequential count is reached;
- and
- (d) second logic circuit means connected to said counting circuit means and said first logic circuit means for
- (i) causing said counting circuit means to reset upon occurrence of said alarm signal and to reset for each of said logic windows following said alarm signal in which at least one short electrical pulse occurs,
- (ii) advancing said counting circuit means if a short electrical pulse does not occur within a logic window, and
- (iii) terminating said alarm signal when said preselected count is reached.
10 more elements
A flame detection system responsive to electromagnetic radiations from a flame to be detected comprising:
- (a) detector means for detecting photons of electromagnetic radiations from a flame and for producing output signals when such photons are detected;
- (b) window generating means for producing sequence of equal time period windows;
- (c) counting means connected to said detector means and to said window generating means for advancing one count when at least one output signal occurs during a window and resetting when no output signal occurs during a window;
- and
- (d) logic means connected to said counting means and to said detector means for producing an alarm control signal when said counting means reaches a preselected count.
2 more elements
Dependencies are inferred from the claim text.