Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1985-12-11
1987-09-29
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250349, 2503581, 2503591, 2503601, 356239, 356431, G01N 2189
Patent
active
046970827
ABSTRACT:
Process for testing transparent material webs, particularly plate glass ribbons or the like, for material defects, in which the glass ribbon or the like conveyed in its longitudinal direction is scanned over its width in a scanning plane at right angles to its conveying plane and direction by means of a laser-produced flying light spot, the forward and back scattering produced by the inclusions is measured in each case one detection plane sloping with respect to the scanning plane, electrical signals are derived from the measured values obtained and said signals are processed for material defect identification, characterized in that a laser operating in the near IR-range is used as the light spot source, as well as apparatus for preforming this process.
REFERENCES:
patent: 3805073 (1974-04-01), Jayachandra et al.
patent: 3808439 (1974-04-01), Renius
patent: 4026656 (1977-05-01), Kusz et al.
patent: 4208126 (1980-06-01), Cheo et al.
Richard Wagner, "Inclusions de Sulfure de Nickel Dans le Verre", Glastechn. Ber., 50 (1977), Nr. 11, S. 296-300.
"Stahl und Eisen", 96 (1976), No. 19, Sep. 23, pp. 913-915.
Flachglas Aktiengesellschaft
Hannaher Constantine
Howell Janice A.
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