Dome gas sensor

G - Physics – 01 – N

Patent

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Details

G01N 21/03 (2006.01) G01J 3/42 (2006.01) G01N 21/35 (2006.01) G01N 33/00 (2006.01)

Patent

CA 2677450

An NDIR (Non-Dispersive InfraRed) gas sensor has the LED radiation source (2) and photodiode detector (3) side by side in a dome shaped gas chamber (5). The mirror coated inner surface (6) of the dome (5) reflects light from the LED (2) to the photodiode (3). The reflecting surface in one embodiment has a plurality of semi-toroidal sub surfaces (51-59), such that radiation originating from a point on the LED is unfocussed as it converges on the photodiode. The LED and photodiode (3) may be mounted on a bridge printed circuit board (4) extending along the diameter of the dome housing. The bridge height is adjustable during assembly to optimise the radiation's incidence onto the photodiode.

L'invention concerne un détecteur de gaz NDIR (infrarouge non diffuseur) ayant la source de rayonnement de DEL (2) et le détecteur de photodiode (3) côte à côte dans une chambre à gaz en forme de dôme (5). La surface interne recouverte d'un miroir (6) du dôme (5) réfléchit la lumière de la DEL (2) à la photodiode (3). La surface réfléchissante dans un mode de réalisation a une pluralité de sous-surfaces semi-toriques (51-59), de telle sorte qu'un rayonnement provenant d'un point sur la DEL n'est pas focalisé lorsqu'il converge sur la photodiode. La DEL et la photodiode (3) peuvent être montées sur une carte de circuit imprimé de pont (4) s'étendant le long du diamètre du logement en dôme. La hauteur du pont est réglable pendant l'assemblage pour optimiser l'incidence du rayonnement sur la photodiode.

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