G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/17 (2006.01) G01J 3/433 (2006.01) G01N 21/31 (2006.01) G01J 3/12 (2006.01) G01N 21/35 (2006.01)
Patent
CA 2066816
11 ABSTRACT IMPROVEMENTS IN OR RELATING TO OPTICAL GAS DETECTORS A light radiation absorption gas detector for detecting the presence of a specified gas, comprising a light source, a region containing a gas to be detected through which light from the source is passed, an interference filter having a substantially flat face and a light radiation absorption peak at a wavelength which facilitates detection of the specified gas, a shaft to which the filter is by means of arms secured for rotation so that a perpendicular to the flat face of the filter is at an angle to the axis of the rotation and light detector means responsive to light from the source which has passed through the region and the filter, for detecting predetermined light amplitude variations, wherein light from the source is arranged to be projected towards the filter at an angle offset from the axis of shaft rotation whereby a filter pass band which includes the said wavelength is scanned consequent upon rotation of the filter, thereby to produce amplitude variations of light in the presence within the region of the specified gas, whereby detection of the specified gas by the detector means is facilitated.
Borden Ladner Gervais Llp
Siemens Plessey Controls Limited
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