Patent ID: 8705021
Filing Date: 2014-04-22
Classification: G01N

Abstract:
1. An inspecting device, comprising: detecting means for sequentially detecting an intensity distribution of transmitted light which (i) has entered a side surface of a columnar preform having through holes and (ii) has been transmitted through a center portion of the preform; moving means for (a) moving the preform so that the preform is rotated about a center axis of the preform, the center axis serving as a rotating axis, or (b) moving the detecting means so that the detecting means rotates around the preform; and calculating means for calculating a time series of a feature value from the intensity distribution of the transmitted light, which intensity distribution has been sequentially detected, the feature value having a value corresponding to at least one of (i) arrangement of the through holes and (ii) a size of each of the through holes.