发明名称 |
Discharge Ionization Current Detector |
摘要 |
A discharge ionization current detector using a low-frequency dielectric barrier discharge with an improved S/N ratio is provided. A current detector 20 is disposed between an excitation high-voltage power source 8 and a discharge electrode 5 to detect a discharge current flowing in pulses due to plasma generation. The detection signal of the current detector 20 and an output signal from a current amplifier 18 for amplifying an ion current are inputted into an output extraction unit 21. The output extraction unit 21 detects a precipitous-rise portion of the discharge current detection signal and generates a trigger signal, and then extracts an ion current signal for a predetermined time period from the trigger signal. This can remove an influence of a noise appearing in a signal during a time period where no plasma emission is generated, thereby improving the S/N ratio of the detection signal.
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申请公布号 |
US2011260732(A1) |
申请公布日期 |
2011.10.27 |
申请号 |
US201113092003 |
申请日期 |
2011.04.21 |
申请人 |
OSAKA UNIVERSITY;SHIMADZU CORPORATION |
发明人 |
SHINADA KEI;HORIIKE SHIGEYOSHI;NISHIMOTO TAKAHIRO;KITANO KATSUHISA |
分类号 |
G01N27/62 |
主分类号 |
G01N27/62 |
代理机构 |
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地址 |
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