Patent ID: 9329026
Filing Date: 2016-05-03
CPC Classification: G01B,G01N

Claim Text:
1. A method for using a chromatic point sensor (CPS) system to inspect a geometric characteristic of a hole at least partially surrounded by an interior surface, the method comprising: providing a CPS system including: positioning the optical pen at a position inside the hole such that the measurement light is incident on the interior surface along the at least three measurement directions; receiving the measurement light reflected from the at least three measurement directions back through the confocal aperture of the optical pen at the position; operating the CPS system to obtain a spectral intensity profile of the measurement light, the spectral intensity profile comprising spectral peak components corresponding to distances to the interior surface that are within the optical pen's measuring range along the at least three measurement directions; and determining the geometric characteristic based at least partially on signal processing operations comprising analyzing the spectral intensity profile to determine at least a first distance measurement from the optical pen to the interior surface along at least a first measurement direction.