Electrooptical Blood-Spot Detection in Intact Eggs

An electrooptical measuring device has been developed for detecting blood spots in intact eggs based on the selective absorption of hemoglobin. The detection system performs a ratio measurement at two wavelengths with an accuracy and stability within 1 percent over a dynamic range of three decades of absolute egg transmittance values. Because of the very low transmittance level much care has been given to stray- and background-light suppression The detection results re substantially independent of electrooptical transfer vriations System design includes economical factors and is partly devoted to a 12 row conveyor belt system with a cycling time of 1 s. The system discriminating sensitivity in selective absorption can be adapted to the natural scatter in the spectral properties of eggs.