Diffusion-type gas sample chamber

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

1994-07-25

1996-03-26

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250343, G01N 2161

Patent

active

055023088

ABSTRACT:
Apparatus for measuring the concentration of a gas present in a sample chamber by ambient pressure diffusion employs a nondispersive infrared gas analysis technique. The sample chamber has the form of a tube that is closed at one end, with a source of radiation and a detector mounted side by side at the other end. The inwardly-facing surfaces of the tube are specularly reflective, whereby the optical length of the sample chamber is twice its physical length. A gas filter cell located in the optical path permits the concentration of an analyte gas to be measured accurately despite the presence in the sample chamber of an interfering gas. A small ultrasonic vibrator affixed to the wall of the sample chamber prevents unwanted particles from accumulating on the semipermeable membranes through which ambient gases diffuse into and out of the sample chamber.

REFERENCES:
patent: 3834123 (1974-09-01), Margraf
patent: 3968367 (1976-07-01), Berg
patent: 4749276 (1988-06-01), Bragg et al.
patent: 5163332 (1992-11-01), Wong

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