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

摘要

An improved open-path fast Fourier (14a) infrared spectrometer includes a circuit or algorithm which performs real-time, spectral alignment on measured interferograms (20) to reduce measuremental errors. The improved spectrometer measures selected water vapor lines in a measurement path (20) and compares the centerline of these measured vapor lines (24) to reference library (38).