Optics: measuring and testing – Inspection of flaws or impurities – Having predetermined light transmission regions
Patent
1982-02-08
1984-05-15
Sikes, William L.
Optics: measuring and testing
Inspection of flaws or impurities
Having predetermined light transmission regions
250225, 350374, G01N 2100
Patent
active
044485271
ABSTRACT:
The detection of surface defects in mechanical parts is effected by the analysis of diffracted light coming from these defects. The detection method includes the steps of illuminating the surface of the part to be examined with incoherent light and forming a flat image of the said surface in a transparent photosensitive layer of a spatial light modulator. The spatial distribution of the intensity of the incoherent light reflected by the said surface produces a corresponding and proportional spatial distribution of values of refractive index in the photosensitive layer. This layer is illuminated with plane polarized, coherent light by frame scanning in elementary areas. During the scanning operation, the variations in at least one of the polarization components of the coherent light are detected by a matrix of converters after the light has traversed the said transparent photosensitive medium.
REFERENCES:
patent: 4283145 (1981-08-01), Miyazawa
Nisenson et al., "Real Time Optical Processing with Bi.sub.12 SiO.sub.20 PROM", Applied Optics, vol. 11, No. 12, pp. 2760-2766.
Iwasa, "Optical Processing: A Near Real-Time Coherent System Using Two Itek PROM Devices", Applied Optics, vol. 15, No. 6, pp. 1418-1424.
Centro Ricerche Fiat S.p.A.
Koren Matthew W.
Sikes William L.
LandOfFree
Method and apparatus for detecting surface defects in mechanical does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for detecting surface defects in mechanical, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for detecting surface defects in mechanical will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-842539