Patent ID: 7619646

Claim:
An optical system effective to illuminate and scan an interior wall of an object having an interior bore, comprising: a light source; an object support disposed between said light source and an image taking lens, said object support being a rod having a first light conducting portion extending therethrough with a beam splitter effective to reflect light from said light source to said interior wall disposed within said first light conducting portion, said object support further having a second light conducting portion disposed generally perpendicularly to said first light conducting portion that is effective to transmit light to said beam splitter for reflection to said interior wall on to said image taking lens; said image taking lens disposed between said object support and a line scan camera, said image taking lens having a depth of focus sufficiently shallow that an exterior wall of said object is out of focus when an opposing interior wall of said object is in focus, and wherein said interior bore and said light conducting portion are in axial alignment with a center optical axis of said image taking lens; and a drive mechanism engaging said object without impacting said axial alignment with a rotary encoder engaging said drive mechanism and driving an electric circuit capable of triggering said line scan camera in response to rotation of the object, thereby building a line by line image of said interior bore.