Patent ID: 6549292
Filing Date: 2003-04-15
Classification: G01B

Abstract:
A method of determining a physical characteristic of a transparent hollow article comprisingpositioning said article at an inspection station, creating a scanning light beam, splitting said scanning light beam into two inspection light beams, causing said two inspection light beams to impinge on said article from opposite different directions, employing a first plurality of sensors to receive light reflected from the external and internal surfaces of a wall of said article from a first said inspection light beam and convert the same into corresponding electrical signals, employing a second plurality of sensors to receive light reflected from the external and internal surfaces of a wall of said article from a second said inspection light beam and convert the same into corresponding electrical signals, determining the times of arrival at said first and second plurality of sensors of light reflected from said article, employing said times to determine said physical characteristic of said article, and performing said method without requiring the detection of only parallel reflected light by said sensor.