APPARATUS AND METHOD FOR REAL-TIME SPECTRAL ALIGNMENT FOR OPEN-PATH FOURIER TRANSFORM INFRARED SPECTROMETERS

Title:

APPARATUS AND METHOD FOR REAL-TIME SPECTRAL ALIGNMENT FOR OPEN-PATH FOURIER TRANSFORM INFRARED SPECTROMETERS

Document Type and Number:

WIPO Patent Application WO1999031461

Kind Code:

A8

Abstract:

An improved method for use with an open-path fast Fourier infrared spectrometer performs real-time, spectral alignment on measured interferograms to reduce measuremental errors. The improved method includes the step of selecting a plurality of water-vapor lines in a defined spectral region and comparing (70) the Centerline of these measured water vapor lines to a reference library (76). From these comparisons, the spectrometer calculates (70) correction factors to apply to the spectrometer bandwidth. The improved spectrometer performs transform function on selected segments of the spectrometer bandwidth which introduce integer-continuous corrective shifts on subsequently measured interferogram data.

Inventors:

WANG CHUNG-TAO DAVID
KAGANN ROBERT HOWARD

Application Number:

PCT/US1998/026802

Publication Date:

August 26, 1999

Filing Date:

December 17, 1998

Export Citation:

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Assignee:

AIL SYSTEMS INC (US)

International Classes:

G01J3/28; G01J3/453; (IPC1-7): G01B9/02

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