| 摘要 |
PROBLEM TO BE SOLVED: To provide a portable small device at a low cost, which improves its detection sensitivity and can carry out a measurement in a short time. SOLUTION: The device is provided with a method (1) in which a crystal oscillator is used, and a gas detection is carried out by utilizing a chemical reaction or an adsorption characteristic between object gas to be measured and an electrode material of a crystal oscillator, or a method (2) in which the crystal oscillator is used, and the object gas to be measured is decomposed by a redox reaction in a reaction tube thereby changing the form of the object gas to be measured into a decomposition product, and the gas detection is carried out by utilizing the chemical reaction or the adsorption characteristic between the decomposition product and the electrode material of the crystal oscillator. COPYRIGHT: (C)2004,JPO
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