Wavelength selection for near-infrared reflectance moisture meters

There can be significant errors in estimating moisture content from the near-infrared reflectance of samples in which there is a moisture content gradient. This paper shows that a moisture meter based on the reflectance at the weak, 970 nm, water absorption band is less sensitive to variability in t...

Full description

Saved in:
Bibliographic Details
Published inJournal of agricultural engineering research Vol. 49; no. 2; pp. 113 - 125
Main Author Bull, C.R.
Format Journal Article
LanguageEnglish
Published London Elsevier Science Ltd 1991
Academic Press
Subjects
Biological and medical sciences
Food industries
Fundamental and applied biological sciences. Psychology
General aspects
Methods of analysis, processing and quality control, regulation, standards
Infrared spectrometry
Quality control
Humidity
Analytical method
Chemical composition
Foodstuff
Reflectance
Online AccessGet full text

Cover

More Information
Summary:There can be significant errors in estimating moisture content from the near-infrared reflectance of samples in which there is a moisture content gradient. This paper shows that a moisture meter based on the reflectance at the weak, 970 nm, water absorption band is less sensitive to variability in the moisture gradient across unmilled grain, than one using the strongly absorbed 1450 nm band. This is because of the greater penetration of the 970 nm radiation into the sample. A further experiment on spruce sawdust samples shows the importance of selecting a suitable reference wavelength in a two wavelength device.
ISSN:0021-8634
1095-9246
DOI:10.1016/0021-8634(91)80032-A