The study on the temperature influence of the grain near infrared spectrum analysis

摘要

Near-infrared spectroscopy was used to examine unmodified wheat powder at temperatures of 14-65°C. A self-regulating diffuse reflected assembly was used to permit collection of spectra of powder samples. Changes to the shape and peak location of the 1400-1500nm and 1900-1950nm water absorption bands, 2000-2050, 2070-2110 and 2250-2300nm bands were measured as temperature varied. Results indicated that temperature changes resulted in slight changes to the water absorption bands in 1400-1500nm and 1900-1950nm regions. From 14-65°C, the 1400-1500nm and 2050-2150nm band shifted approximately 10nm and 16nm toward shorter wavelengths, and 2000-2050nm band shifted approximately 14nm toward longer wavelengths. In addition few numbers of samples cannot constitute good temperature insensitive calibration model even though the spectra were obtained at wide temperature condition.