Diffusion-type gas sample chamber

Details Diffusion-type gas sample chamber Diffusion-type gas sample chamber

1992-07-16

1994-08-23

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

2503385, 356437, G01N 2161

Patent

active

053409868

ABSTRACT:
The improved sample chamber includes an elongated hollow tube closed at one end and having specularly-reflective inwardly facing surfaces. A source of radiation and a detector of radiation are mounted side by side in the open end of the hollow tube, both facing the closed end. A plurality of filtering apertures are formed in the tube, and each aperture is covered by a sheet of a semipermeable membrane that serves to prevent airborne particles larger than a predetermined size from entering the chamber while not interfering with the free diffusion of the gas to be measured into and out of the chamber. The use of an elongated hollow tube that is closed at one end results in no loss in the efficiency with which the radiation is conducted from the source to the detector while decreasing the external length of the chamber by 50 percent.

REFERENCES:
patent: 4749276 (1988-06-01), Bragg et al.
patent: 5125742 (1992-06-01), Wilks, Jr.
patent: 5163332 (1992-11-01), Wong

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