Method and Apparatus for Detecting Cracks in Eggshells

摘要

This invention relates to a method and an apparatus for characterizing eggshells of eggs, the eggs being supported, comprising:—deforming the eggshell,—scanning the eggshell with a laser beam of a Self Mixing Laser Vibrometer (SMLV) with scanning signals, whereby a reflection light signal of reflection light is obtained,—processing scanning signal and the reflection signal with the SMLV, whereby a mixed signal with crack information is obtained,—during scanning moving the eggs relative to the SMLV,—comparing the signals with preset criteria and characteristics of such eggs, whereby comparative data are obtained, and—characterizing the eggshells on the basis of the comparative data.

主权项

1. A method for characterizing eggshells of eggs, the eggs being supported, comprising,
deforming at least a first part S1 of the eggshell of such an egg, scanning with a laser beam of a Self Mixing Laser Vibrometer (SMLV) with scanning signals said first part S1, or an at least second part S2 of said eggshell with laser source light from a laser source having wavelengths λ, with 100<λ<1500 nm, whereby a reflection light signal of reflection light is obtained, processing said scanning signal and said reflection signal with said SMLV, whereby a mixed signal is obtained with amplitude A(t) or quantity A′(t) derived therefrom, whereby crack information is obtained, during scanning moving the eggs relative to the SMLV, scanning at said parts immediately after deformation that starts at t(0), in the period 0