Gas analyzer apparatus

Details Gas analyzer apparatus Gas analyzer apparatus

1989-01-30

1990-02-06

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

With sample excitation

313619, 356313, G01N 2166

Patent

active

048984655

ABSTRACT:
A cold-cathode gas discharge device is coupled between a gas sample inlet and a high vacuum and includes spaced-apart electrodes which, when coupled across a high voltage DC power supply, causes a glow-discharge to be set up within the device with the intensity of the emitted light being proportional to the percentage of a given gas contained within a gas mixture introduced through the sampling inlet. In accordance with the present invention, the glow-discharge device contains a tubular pathway which is bent at a point intermediate the spaced electrodes so that they are not co-linear along the tubular path. A photodetector is sighted coaxially with the downstream leg of the bent pathway and, as such, senses the light emitted in a longitudinal direction rather than in a transverse direction. As such, errors due to fogging of the pathway over time by electrode material or the like and movement of the cathode dark-spaced and Faraday dark-space within the tube do not alter the measurable radiation.

REFERENCES:
patent: 4801209 (1989-01-01), Wadlow

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