Optics: measuring and testing – Refraction testing – Prism engaging specimen
250222PC, 250345, 250575, 356 51, 356201, G01N 2126
In a method for examining pulp for shives present therein a suspension of the pulp is passed through a measuring duct with transparent walls and two mutually perpendicular light beams are directed through the measuring duct in a plane perpendicular to the direction of flow in the measuring duct. The intensities of the light beams after their passage through the measuring duct are measured by means of two photo detectors and the output signals of the photo detectors are multiplied to provide a combined signal representing the product of the output signals of the photo detectors. This combined signal is analyzed with respect to the temporary amplitude reductions occurring therein due to the presence of shives in the pulp suspension flow passing through the measuring duct. Preferably, the light beams consist of light having a wavelength within the infra-red range.
patent: 3028501 (1962-04-01), Lamparter
patent: 3153727 (1964-10-01), Nathan
patent: 3275834 (1966-09-01), Stevens
patent: 3515885 (1970-06-01), Imadate
Brecht et al., "Messtechnische Erfassung von Flecken und Splittern in Halb- und Ganzstoffen mit einem Optisch-Elektronischen Gerat", Das Papier vol. 22, No. 10A, Oct. 1968, pp. 784-792.
Corbin John K.
Rosenberger Richard A.
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