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:
Feb. 28, 1995
Filed:
Feb. 25, 1994
Wayne E Wentworth, Houston, TX (US);
Stanley D Sterns, Houston, TX (US);
Other;
Abstract
A pulsed discharge helium photon ionization detector comprises an elongate cylindrical body having an axial flow path. A helium source is connected to deliver helium flowing along this path. In the helium flow path, transversely positioned, facing electrodes are located to form a spark discharged across the helium flow path wherein the spark interacts with the helium to cause photon ionization. Downstream within view of the spark, a counter flow dopant gas injection tube is positioned to deliver dopant at a reduced flow rate. The dopant is swept back along the helium flow path past a set of electrode rings spaced along the flow path. The interaction of the photon ionization with the dopant creates a base current which can be detected by an electrometer across the terminals. A sample injection tube adds an eluted GC column sample or peak which changes the base current so that eluted sample is measured.