Optics: measuring and testing – Inspection of flaws or impurities – Transparent or translucent material
Patent
1990-03-30
1991-06-04
Turner, Samuel
Optics: measuring and testing
Inspection of flaws or impurities
Transparent or translucent material
356240, 250223B, G01N 2190
Patent
active
050209086
ABSTRACT:
An apparatus for the optical detection of cracks in transparent objects having several radiation sources and several groups of detectors which each have eight detectors. Each radiation impulse from one or more radiation sources may impinge on one or more groups of detectors and form an electro-optical channel independent of the others. The channels are switched on and off periodically one after the other. The sensitivity level of each group of detectors is individually programmable. The groups of detectors and the radiation sources are mounted on a stand so that they may be adjusted having a frame with holders. Light scattering is minimized by fitting the groups of detectors with shields. Such an apparatus can be relatively simply set up and adjusted and be simplified as a result of the separation of the electro-optical channels. The electronic switching permits a rapid, safe and automatic detection of flaws when a suitable microprocessor is employed.
REFERENCES:
patent: 4201338 (1980-05-01), Keller
patent: 4208130 (1980-06-01), Saconney et al.
patent: 4293219 (1978-08-01), Ducloux
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