To improve the SN ratio of a signal originating from a target component by reducing drift of the signal resulting from electromagnetic noise jumping into an electrode, and ambient temperature fluctuation.
A dummy electrode 11 having the same structure as that of an electrode 10 for ion collection is arranged and installed at a place in a lower part gas passage 14, where only dilution gas not mixed with sample gas flows, and differential detection between an output A of a current amplifier 21 connected to the electrode 10 for ion collection and an output B of a current amplifier 22 connected to the dummy electrode 11 is carried out by a differential amplifier 24. As a result, in-phase noise and drift are removed and a signal corresponding to the amount of a target component can be detected.
HORIIKE SHIGEYOSHI
NISHIMOTO HISAHIRO
KITANO KATSUHISA
UNIV OSAKA
| JP2010060354A | 2010-03-18 | |||
| JP2009513989A | 2009-04-02 |
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