Dome Gas Sensor
First Claim
Patent Images
1. A gas sensor comprising:
- a radiation source;
a radiation detector; and
a reflecting means arranged to reflect radiation from the radiation source to the radiation detector along an optical path,wherein the radiation source and the radiation detector are disposed side by side.
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Abstract
A Non-Dispersive InfraRed gas sensor has the LED radiation source and photodiode detector side by side in a dome shaped gas chamber. The mirror coated inner surface of the dome reflects light from the LED to the photodiode. The reflecting surface in one embodiment has a plurality of semi-toroidal sub surfaces, such that radiation originating from a point on the LED is unfocussed as it converges on the photodiode. The LED and photodiode may be mounted on a bridge printed circuit board extending along the diameter of the dome housing. The bridge height is adjustable during assembly to optimise the radiation'"'"'s incidence onto the photodiode.
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Citations
54 Claims
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1. A gas sensor comprising:
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a radiation source; a radiation detector; and a reflecting means arranged to reflect radiation from the radiation source to the radiation detector along an optical path, wherein the radiation source and the radiation detector are disposed side by side. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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Specification