The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 05, 2014
Filed:
Apr. 21, 2011
Kei Shinada, Uji, JP;
Shigeyoshi Horiike, Uji, JP;
Takahiro Nishimoto, Soraku-gun, JP;
Katsuhisa Kitano, Ibaraki, JP;
Kei Shinada, Uji, JP;
Shigeyoshi Horiike, Uji, JP;
Takahiro Nishimoto, Soraku-gun, JP;
Katsuhisa Kitano, Ibaraki, JP;
Shimadzu Corporation, Kyoto-shi, JP;
Osaka University, Osaka, JP;
Abstract
A discharge ionization current detector using a low-frequency dielectric barrier discharge with an improved S/N ratio is provided. A current detectoris disposed between an excitation high-voltage power sourceand a discharge electrodeto detect a discharge current flowing in pulses due to plasma generation. The detection signal of the current detectorand an output signal from a current amplifierfor amplifying an ion current are inputted into an output extraction unit. The output extraction unitdetects 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.