| 摘要 |
<p>PURPOSE:To make it possible to measure a desired kind of gas, by analyzing gas permeated through a high-molecular permeable membrane by an infrared type gas analyser. CONSTITUTION:As a permeable membrane 6, one which is impervious to insulating oil but pervious to only gas dissolved in said oil may be used. In addition, because a certain time is required before the gas dissolved in the oil is permeated into a gas chamber through the permeable membrane 6 to reach equilibrium, the area of the opening part of the gas chamber 7 is made large and the volume of the gas chamber 7 is reduced as possible so as to shorten a time before the gas reaches equilibrium. Gas belonged to a kind to be measured is sealed in light receiving chambers 11a, 11b and, when the same kind of gas is present in the gas chamber 7, infrared rays having a wavelength range peculiar to said gas emitted from a light source 9 is partially absorbed in the gas chamber 7 and, therefore, infrared rays having said wavelength range incident to a light receiving chamber 11 is reduced. By this phenomenon, pressure difference is generated in the light receiving chambers 11a, 11b by the change of absorbed energy and a gas stream is generated in the conduit connecting the light receiving chambers 11a, 11b. This minute amount of the gas steam is converted to an electric signal by a detector 12 and the gas concn. in the gas chamber can be determined from the signal amount thereof.</p> |
