Gas sensor
AssigneeDynament Limited
InventorDavid Michael Stuttard
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Abstract
A gas sensor of the type that detects the presence of a specific gas by monitoring the absorption of optical radiation transmitted through a chamber containing a sample of gas under test comprises an optical source for emitting radiation therefrom and a detector sensitive to radiation emitted from the source at opposing ends of a circumferential chamber, having optically reflective surfaces, extending around the periphery of a sensor housing. The optical pathway between the source and detector may include a radial portion as well as a circumferential portion to allow one or other of the source and detector to be located in a central chamber of the sensor housing.
Claims19
A gas sensor comprising:
- an optical source for emitting radiation therefrom;
- a detector sensitive to radiation emitted from the source;
- a circumferential chamber, having optically reflective surfaces, extending between the source and the detector.
The gas sensor of claim, 4 in which the central chamber is defined by the internal surface of the inner circumferential wall.
A gas sensor comprising:
- an optical source for emitting radiation therefrom;
- a detector sensitive to radiation emitted from the source;
- a chamber, extending between the source and the detector, defined by a plurality of non-focussing, planar surfaces disposed to form a folded optical pathway that includes a plurality of segments substantially parallel to one another.
A method of forming a gas sensor comprising the steps of providing an optical source for emitting radiation therefrom and a detector sensitive to radiation emitted from the source at opposite ends of a circumferential chamber extending around the periphery of a sensor housing anal having optically reflective surfaces along the length thereof.
A gas sensor substantially as described herein with reference to the accompanying drawings.
Dependencies are inferred from the claim text.