Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1991-05-24
1992-07-21
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250340, 250341, G01N 2135
Patent
active
051325381
ABSTRACT:
In a method for measuring protein content of whole grain kernels with a near infrared spectrophotometer, reflectance measurements are made at wavelengths shorter than 1600 nanometers. The wavelengths are selected to correspond with absorbance bands of the constituents of the sample. The measurements are encoded into absorbance data and are normalized by subtracting the absorbance value at a first wavelength and then dividing the resulting data by the value at a second wavelength. In accordance with one embodiment, the normalized data is substituted in a formula having coefficients determined by regression from samples having known percentages of protein in the sample to yield the percentage of protein in the unknown sample. In accordance with a second embodiment, the second differential of the absorbance data is determined and the resulting differential values are inserted in the formula having coefficients obtained from the known samples to yield the percentage or protein in the unknown sample.
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"Optimization of Mathematical Treatments of Raw Near-Infrared Signal in the Measurement of Protein in Hard Red Spring-Wheat. I, Influence of Particle Size", Cereal Chemistry, K. H. Norris et al., pp. 158-165, vol. 61, No. 2, 1984.
"Identification of Wavelengths of Near-Infrared Absorbers", Instrumentation Research Laboratory, Near-Infrared Techology in the Agriculture and Food Industries, 1987.
Glick Edward J.
Hannaher Constantine
NIRSystems Incorporated
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