Nondispersive optical monitor for nitrogen-oxygen compounds

Details Nondispersive optical monitor for nitrogen-oxygen compounds Nondispersive optical monitor for nitrogen-oxygen compounds

1996-12-20

1998-10-06

Rosenberger, Richard A.

Optics: measuring and testing

For light transmission or absorption

By comparison

356437, G01N 2161

Patent

active

058185984

ABSTRACT:
A gas-correlation filter spectroscopy-based method and apparatus for determining the concentration of gas species having significant average broadband absorption incorporates a compensating filter having an absorption spectrum that varies with wavelength similarly to the spectrum of the gas species. The compensating filter eliminates interference due to differential absorption. The invention is especially suited to detecting nitrogen dioxide.

REFERENCES:
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patent: 3718429 (1973-02-01), Williamson, Jr.
patent: 3811776 (1974-05-01), Blau, Jr.
patent: 3860818 (1975-01-01), Stadler et al.
patent: 4272249 (1981-06-01), D'Antonio
patent: 4632563 (1986-12-01), Lord
Herget et al., Applied Optics, 15:1222-1228 (May 1976).

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