Patent ID: 8368878

Claim:
A method of facilitating quality control for manufactured objects, the method comprising: during a first period, sequentially illuminating at least a first portion of an object being evaluated with a plurality of bands of electromagnetic energy in a first sequence; during the first period, measuring a plurality of responses to the illumination from at least the first portion of the object being evaluated; comparing the measured responses of the first period to a first set of reference responses to illumination of a reference specimen of a reference object; during a second period, sequentially illuminating at least the first portion of the object being evaluated with a plurality of bands of electromagnetic energy in a second sequence, the second sequence varied from the first sequence; during the second period, measuring a plurality of responses to the illumination from at least the first portion of the object being evaluated in the second sequence; and comparing the measured responses of the second period to a second set of reference responses to illumination of the reference specimen of the reference object; and determining whether the object being evaluated is acceptable based at least in part on the comparison of the measured responses of the first period to the first set of reference responses and based at least in part on the comparison of the measured responses of the second period to the second set of reference responses.