Among flawdetection systems of conventional types included is a flying-spot type flawdetection system that scans glass plate with a light spot to detect with a light receptor changes in the optical axis of the transmitted light.
Flaws like cords and reams, however, cause no attenuation in the amount of transmitted light, resulting in very little changes in the light transmitted in the direction of the manufacturing line (about 1/100 as small as the changes in the case of bubbles).
Where flaws exist in the glass plate 10, spikes in the negative or positive direction are generated at positions corresponding to the positions of the flaws.
Flawdetection techniques, such as, acoustic testing, x-rays, eddy currents, microscope examination and dye penetrants are well known to those versed in the state-of-the-art.
2, a schematic illustration of the optical flawdetection apparatus, with a one-dimensional reimaging capability for one-dimensional spectrum measurements in accordance with the present invention, is illustrated.
The presence of a flaw on the sample would be evident by such diffraction pattern changes such as, for example, an apparent splitting of the distribution, a broadening of the pattern, or an alteration in the shape and/or symmetry of the content of the diffraction pattern.
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