G - Physics – 01 – J
Patent
G - Physics
01
J
73/57
G01J 3/46 (2006.01) G01N 21/00 (2006.01) G01N 21/86 (2006.01)
Patent
CA 1085647
APPARATUS FOR DETECTING THE PRESENCE OF A SPECIFIC SUBSTANCE IN A GAS STREAM ABSTRACT OF THE DISCLOSURE An apparatus for detecting the presence of a specific substance in a gas stream is disclosed. The apparatus comprises a sensing chamber adapted to receive a test paper which is sub- ject to coloration when contacted by a specific substance in a gas contained in the sensing chamber, means for generating a light beam and directing it toward the test paper in the sensing cham- ber, a light beam sensing device responsive to the extent to which the test paper in the sensing chamber undergoes coloration in res- ponse to exposure to the specific substance in the gas stream, an amplifier connected to the light beam sensing device for providing an output voltage which is proportional to the coloration of the test paper, and means connected to the amplifier for providing an output signal which is an instantaneous indication of the concen- tration of the substance to be monitored. The apparatus is fur- ther provided with a beam splitter for dividing the light beam in- to two separate beams one directed toward the test paper in the sensing chamber and the other toward a variable optical density filter, and a second light beam sensing device responsive to the transmittance of the variable optical density filter. The ampli- fier is responsive to the two light beam sensing devices for pro- viding an output which is a function of the ratio of the light sensed by the two light sensing devices irrespective of the light source intensity variations. An automatic zero adjustment device is also provided for resetting the output of the amplifier to zero prior to taking measurements.
298415
Noranda Mines Limited
Primak & Co.
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