Patent ID: 6882436
Filing Date: 2005-04-19
Classification: G01B

Abstract:
1. A method for estimating the depth of a hole through a workpiece, the method comprising the steps of: providing a light recording apparatus; placing the light recording apparatus at a predetermined first distance away from a surface of the workpiece proximate the hole; providing a light source apparatus; illuminating a side surface of the hole with a light emitted from the light source apparatus; recording an image of a far side surface of the hole with the light recording apparatus; determining a hole image size indicative of a diameter of the image; determining a hole size indicative of a diameter of the hole; employing the hole image size and the hole size to calculate a second distance indicative of a distance between the light recording apparatus and the far side surface of the hole; and determining the depth of the hole by subtracting the first distance from the second distance.