Electronically scanned spectrometer color, brightness and opacit

Details Electronically scanned spectrometer color, brightness and opacit Electronically scanned spectrometer color, brightness and opacit

1982-11-01

1986-01-21

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

356418, G01J 351

Patent

active

045654441

ABSTRACT:
Apparatus for measuring the color, brightness and opacity of a moving web in which light from a plurality of sources is directed towards and through a moving web. Light reflected from the surface of the web is conveyed by a plurality of light pipes to a first photodetector array located at a point remote from the web. A circular variable bandpass filter varies the wavelength of the radiation reaching the detector substantially continuously through the optical spectrum to produce a detector output which periodically scans the optical spectrum. The detector outputs at various wavelengths are weighted by a microcomputer to produce brightness and X, Y and Z tristimulus values. Light transmitted through the web is conveyed by a plurality of light pipes to a second photodetector array also located at a point remote from the web. The photodetector is also monitored by the microcomputer to provide an indication of the opacity of the web.

REFERENCES:
patent: 2892951 (1959-06-01), Linderman
patent: 3206606 (1965-09-01), Burgo et al.
patent: 3806256 (1974-04-01), Ishak
patent: 3835332 (1974-09-01), Bridges
patent: 3896730 (1974-04-01), Tirkkonen et al.
patent: 3936189 (1976-02-01), DeRemigis
patent: 3977762 (1976-08-01), Sandbank
patent: 4019819 (1977-04-01), Lodzinski
patent: 4029419 (1977-06-01), Schumann et al.
patent: 4222064 (1980-09-01), Lodzinski
patent: 4439038 (1984-03-01), Mactaggart
Tirkkonen et al., "A new infra-red absorption method for the measurement of paper web composition," Paper, Oct. 4, 1972, pp. 554-558.

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