CHEMICAL MAPPING IN THE MID-IR AND NEAR-IR SPECTRAL REGIONS BY HADAMARD-TRANSFORM FT-IR SPECTROMETRY

A movable two-dimensional (2D) Hadamard encoding mask is obtained and combined with conventional FT-IR spectrometers for use in both the mid - and near-infrared spectral regions, Chemical maps and spectra of ind ividual pixels of the maps can be obtained from heterogeneous samples by using this combination of a moveable 2D Hadamard encoding mask and an FT-W spectrometer, We call the procedure Hadamard transform/FT-IR s pectrometry. Spectra of usable signal-to-noise ratio and reliable chem ical maps are obtained in reasonable data acquisition and processing t ime.