Empty bottle inspection

An apparatus comprising an inspection device for checking bottles, said inspection device comprising at least a first illuminating device and a second illuminating device, and at least a first camera and a second camera, said at least a first illuminating device and a second illuminating device and said at least a first camera and a second camera forming an inspection bridge, wherein said inspection bridge comprises, on a first inspection side thereof, said first illuminating device, and said first camera, and on a second inspection side opposite the first inspection side, said second illuminating device and said second camera, wherein said second illuminating device has a structure identical to said first illuminating device, wherein said first and second illuminating devices each comprise a light source, a beam splitter, and a first optical component between said light source and said beam splitter, wherein said first illuminating device and said second illuminating device each have a first optical component, said first optical component including a first optical layer and a second optical layer, wherein said first optical layer comprises a lens, and wherein said second optical layer comprises a polarization filter and a diffuser material, wherein said beam splitters each comprise a mirror side and an opposite side and are arranged so that light from said light source of said respective illuminating device of said first inspection side is directed towards a bottle to be inspected, said bottle being trans-illuminated, and wherein light from said trans-illuminated bottle is reflected on said mirror side of said beam splitter of said second inspection side to said second camera, whereby said second camera captures said light whereby, in operation, said light source of said illuminating device of said first inspection side emits a flash of light that traverses said first optical component and said beam splitter and passes through said second optical component, thereby trans-illuminating said bottle, said second camera captures an image of said trans-illuminated bottle, said image having been reflected from said mirror side of said beam splitter of said second inspection side, and after deactivation of said light source of said illuminating device of said first inspection side, said light source of said illuminating device of said second inspection side emits a flash of light that traverses said second optical component and said beam splitter and passes through said first optical component, thereby trans-illuminating said bottle, and said first camera captures an image of said trans-illuminated bottle, said image having been reflected from said mirror side of said beam splitter of said first inspection side.