Nondispersive gas analyzer having no moving parts

Details Nondispersive gas analyzer having no moving parts Nondispersive gas analyzer having no moving parts

1985-10-09

1987-09-15

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250339, 250353, 356437, G01N 2103, G02F 129

Patent

active

046941738

ABSTRACT:
A multi-component non-dispersive gas analyzer of a type typically used to measure the concentrations of gases present in automotive emissions and in breath analyzers has no moving parts and employs electrically operated means for effectively inserting and removing a reference cell from the optical path and for selecting a particular filter to determine momentarily the wavelengths of radiation being examined. The means for accomplishing these ends include a substrate on which a layer of vanadium dioxide is deposited. The layer is a good reflector at temperatures greater than 67.degree. C. and reflects only slightly at lower temperatures. The layer is alternately heated by an electrical current and is then allowed to cool to provide the desired optical switching action. This electrically-controlled selectively reflective layer is then used in conjunction with the reference cell and with an array of filters to implement the necessary switching and selection of the components.

REFERENCES:
patent: 2824235 (1958-02-01), Hahn, Jr. et al.
patent: 3383460 (1968-05-01), Pritchard
patent: 3811776 (1974-05-01), Blau, Jr.
patent: 4283113 (1981-08-01), Eden
patent: 4515472 (1985-05-01), Welch
patent: 4549080 (1985-10-01), Baskins et al.

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