发明名称 |
EXHALED GAS DETECTING METHOD AND DEVICE THEREFOR |
摘要 |
A gas detecting method and a device therefor, wherein the time needed from the time the power is turned on till gas detection becomes possible is short. A microcomputer (5) delivers a pulse signal to cause the on-duty of a transistor (Q1) to be 75 mu sec from an exhaled gas detection to reduce the average voltage to be applied to a heater (2) and causes the temperature of a metal oxide semiconductor gas sensor (3) to shift to a lower-temperature heating state. The resistance value of a gas sensor sampled at the point of time this shifting is started is stored in a built-in RAM as a reference resistance value RO', and ratios Rs/RO' are computed where Rs is a resistance value found by sampling thereafter every 0.5 sec. And the ratio of the calculated value obtained 2 sec after the start of low temperature heating state shift, to the reference value (Rs/RO) found in the adjustment mode is found, on the basis of which ratio the degree of halitosis is determined and a character corresponding to the determined degree of halitosis is displayed on an LCD (4).
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申请公布号 |
WO0065334(A1) |
申请公布日期 |
2000.11.02 |
申请号 |
WO2000JP02714 |
申请日期 |
2000.04.26 |
申请人 |
FIS INC.;KIRA, MITSUHARU;YANAGIDANI, JUNKO;MURAKAMI, NOBUAKI;MATSUMOTO, TAKASHI |
发明人 |
KIRA, MITSUHARU;YANAGIDANI, JUNKO;MURAKAMI, NOBUAKI;MATSUMOTO, TAKASHI |
分类号 |
A61B10/00;G01N27/12;G01N33/497;(IPC1-7):G01N27/12 |
主分类号 |
A61B10/00 |
代理机构 |
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