Patent ID: 7372034

Claim:
A measurement device for detecting agricultural crops, the measurement device comprising: a wall defining a portion of a conveyor channel for conducting a flow of said crops in a first direction and being provided with a first opening; a holding plate being positioned within said first opening and being provided with a second opening; a light-transmitting panel being positioned within said second opening; and an optical sensor capable of generating a light source and of receiving reflected light being positioned with respect to the light-transmitting panel so as to impinge generated light upon, and to receive reflected light from, the agricultural crops in the conveyor channel and thereby detect the agricultural crops in the conveyor channel through the light-transmitting panel; and said holding plate, together with said light-transmitting panel, being mounted for movement between a first position and a second position, and, while in the second position, the light-transmitting panel extending in a second direction at least partly beyond said wall into the conveyor channel in oblique relationship to said first direction so that agricultural crops passing through said channel are able to contact and clean at least a portion of the light-transmitting panel.