发明名称 |
GAS MEASURING APPARATUS, GAS ALARM DEVICE AND GAS MEASURING METHOD |
摘要 |
PROBLEM TO BE SOLVED: To provide a gas measuring apparatus and method capable of detecting a very small amt. of the component gas in mixed gas. SOLUTION: Voltage wherein sine wave voltage and random voltage are superposed one upon another by a sine wave voltage generator 16 and a noise generator 18 is applied to a heater 12B and the conductivity of an N-type semiconductor 18 is detected as voltage by a detection resistor RL and the concn. of the component gas in mixed gas is operated by a microcomputer 20. Since weak output voltage exceeding a detection limit temporarily can be detected on the basis of the random change on the surface of an N-type semiconductor 12A, the concn. of a very small amt. of the component gas in the mixed gas can be measured.
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申请公布号 |
JP2000292401(A) |
申请公布日期 |
2000.10.20 |
申请号 |
JP19990096184 |
申请日期 |
1999.04.02 |
申请人 |
MOTOSAN ENGINEERING KK |
发明人 |
KOIZUMI JUNICHI;TANIMOTO HIROSHI |
分类号 |
G01N27/12;(IPC1-7):G01N27/12 |
主分类号 |
G01N27/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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