G - Physics – 01 – N
Patent
G - Physics
01
N
73/59
G01N 25/68 (2006.01)
Patent
CA 1322867
METHOD OF AND APPARATUS FOR MEASURING VERY LOW WATER CONTENT IN GAS ABSTRACT OF THE DISCLOSURE A method is disclosed for measuring the amount of water in a gas with a very low water content which comprises using a dew-point meter or a frost-point meter comprising: a reflecting mirror whose temperature is variable in the range of from room temperature to the temperature of liquid nitrogen; a gas ejecting nozzle disposed so as to face said reflecting mirror; means for projecting either a condensed light ray or a laser beam onto that portion at which dew and/or frost is formed; and means for detecting a sudden increase in the intensity of scattered light, the process comprising: a step of cooling a gas to be measured so that its temperature becomes close to that of the mirror; a step of ejecting the gas from the said nozzle so as to hit said reflecting mirror; a step of projecting either a condensed light ray or a laser beam onto that portion of the mirror surface against which the gas to be measured is blown; and a step of detecting a sudden increase in the intensity of scattered light, thereby measuring a low dew point in the range of from -80°C to the temperature of liquid nitrogen.
569063
Kijima Takahiko
Nishizawa Junichi
Tagawa Taichi
Nishizawa Junichi
Osaka Sanso Kogyo Ltd.
Riches Mckenzie & Herbert Llp
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