Importance

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Abstract

In apparatus for measuring the quality of a granular product in continuous flow, the product is allowed to move along a channel having a window set in the channel boundary contacted by the moving product. An optical system monitors product in the channel. A light source illuminates product in the channel through the window, and a sensor receives light reflected from the product through the window in at least two wavelength ranges. A processor receives signals from the sensor representative of the quantity of reflected light received in the respective wavelengths, and compares the respective signals to generate a measurement of the product quality. The window will normally be disposed in the underside of the channel, with the channel set at an angle of at least 45° to the horizontal to allow product to move there along under gravity, and against the window.

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First Claim