PURPOSE: To correctly measure the grain size or moisture of an object to be measured.
CONSTITUTION: This grain size/moisture measuring device is provided with a light projecting means (rotary sector 5) projecting at least one or more prescribed light quantities of light or the light of the wavelength absorbed by moisture and the light of the wavelength not absorbed by moisture to an object 3 to be measured, a detecting element 6 detecting the light reflected on the object 3, and an arithmetic means 10 calculating the grain size of the object 3 based on the fluctuation quantity on one light quantity of light within the output of the detecting means 6 or the ratio of fluctuation quantities on different light, correcting the ratio signal between the light of the wavelength absorbed by moisture and the light of the wavelength not absorbed by moisture based on the grain size signal, and calculating the moisture signal.
MIYAUCHI KATSUYUKI
SHIMIZU TAKAO
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