Enhanced pathlength gas sample chamber

Details Enhanced pathlength gas sample chamber Enhanced pathlength gas sample chamber

1994-09-07

1995-09-26

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503385, 356437, G01N 2161

Patent

active

054536219

ABSTRACT:
The sensitivity of a nondispersive infrared gas analyzer increases with increasing pathlength, which increases the absorption of the infrared radiation by the gas whose concentration is to be determined. The present invention includes the addition of an obstructing element that further increases the average pathlength. In one embodiment the obstructing element consists of a highly reflective elongated cylinder located with its axis collinear with the axis of the tubular chamber. In another embodiment, the sample chamber includes a converging section, the smaller end of which is joined to an elongated tubular section of uniform cross section. The improvements are applicable to both pumped and diffusion-type sample chambers.

REFERENCES:
patent: 4190363 (1980-02-01), Adrian
patent: 5163332 (1992-11-01), Wong

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