Flame detector using filtering of ultraviolet radiation flicker

F - Mech Eng,Light,Heat,Weapons – 23 – N

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F23N 5/08 (2006.01)

Patent

CA 2460584

A flame detector for a burner system having a flame during combustion that emits UV radiation, has a low gain UV sensor, a capacitor, a band pass filter receiving the capacitor's signal, and a rectifier receiving the band pass filter signal and providing a rectifier signal. A low pass filter receives the rectifier signal and provides a flame signal as an output whose magnitude is indicative of presence or absence of flame. An optical filter interposed between the UV sensor and the flame and having optical bandpass characteristics attenuating UV radiation outside the wavelength associated with the flame, improves operation.

L'invention concerne un détecteur de flammes pour un brûleur qui produit une flamme qui, lors de la combustion, émet un rayonnement ultraviolet. Ce détecteur de flammes comprend un détecteur de rayonnement ultraviolet à faible gain, un condensateur, un filtre passe-bande recevant le signal du condensateur et un rectificateur recevant le signal du filtre passe-bande et produisant un signal de rectification. Un filtre passe-bas reçoit le signal de rectification et produit un signal de flamme utilisé comme sortie dont l'amplitude indique la présence ou l'absence de flammes. Un filtre optique intercalé entre le détecteur de rayonnement ultraviolet et la flamme et présentant des caractéristiques de passe-bande optiques qui atténuent le rayonnement ultraviolet à l'extérieur de la longueur d'onde associée à la flamme, améliore le fonctionnement du détecteur de flammes selon l'invention.

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