Method for the on-line measurement of inclusions in pulp

Details Method for the on-line measurement of inclusions in pulp Method for the on-line measurement of inclusions in pulp

1981-03-18

1983-09-06

Alvo, Steve

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

162 49, G01N 2155, G01N 2188, G01N 2312

Patent

active

044026048

ABSTRACT:
Apparatus for inspecting pulp or similar material arranged to flow in a sheet 10 past an inspection station, comprising a row of photosensitive devices 14 arranged to receive light reflected from or transmitted through the material, circuit means 30 receiving the output signals from the photosensitive devices and providing a defect signal when an inclusion in the pulp passes the inspection station, and integrating circuitry 32 adapted to integrate the defect signal with respect to time thereby to measure the total equivalent black area of the sheet 10. To allow for integration over a long travel of the sheet, the integrating circuitry includes an integrator 32, and a pulse generator 34 adapted to receive the output of the integrator and to generate an output pulse when the result of the integration reaches a predetermined magnitude. The integrator is reset to zero on the occurrence of each said pulse, and a counter 36 is arranged to count the pulses generated by the pulse generator.

REFERENCES:
patent: 3827809 (1974-08-01), Nash
patent: 3833816 (1974-09-01), Emura et al.
patent: 4093866 (1978-06-01), Kusdan et al.
patent: 4253113 (1981-02-01), Decavel et al.
patent: 4255385 (1981-09-01), Hughes, Jr. et al.

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