| 摘要 |
PROBLEM TO BE SOLVED: To provide a detector and a method for detecting the presence of test gas with high sensitivity, as to a conventional technique. SOLUTION: The present invention discloses the detector and the method for detecting the presence of the test gas. The detector includes a vacuum chamber connected to a vacuum pump provided with an electronic power source unit. At least one portion of the vacuum chamber is separated from a peripheral external environment by a film selectively permeable as to the test gas. A gas flow from the external environment is guided forcibly over the whole film surface via a flow conveying member, including an intake duct, a diffusion member and an exhaust duct. The presence of the test gas is detected by the change in the current to the vacuum pump supplied from an electric power source. COPYRIGHT: (C)2007,JPO&INPIT
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