Paper roughness or glass sensor using polarized light reflection

Details Paper roughness or glass sensor using polarized light reflection Paper roughness or glass sensor using polarized light reflection

1991-06-27

1992-11-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250225, G01N 2186

Patent

active

051626608

ABSTRACT:
To detect roughness on a travelling surface of a web such as paper a beam of polarized light is directed at an angle onto the web and focused by a focal lens to illuminate a spot on the surface and a specularly reflected component of the light is collected through a second lens focused on the spot. A detector is aligned to receive a portion of the specularly reflected collimated light from the spot passing through a selecting aperture and generates a signal depending on the intensity of the specular light passing through the aperture and received by the detector thereby to provide an indication of the roughness (or smoothness) of the surface.

REFERENCES:
patent: 2755702 (1956-07-01), Cooke
patent: 3737236 (1973-06-01), Borrelli
patent: 3819948 (1974-06-01), Iijima et al.
patent: 4019066 (1977-04-01), Lucas et al.
patent: 4658148 (1987-04-01), Naito
patent: 4676638 (1987-06-01), Yasuda
patent: 4864123 (1989-09-01), Mizutani et al.
patent: 4931657 (1990-06-01), Houston et al.
`Optical Measurement Throws New Light on Paper Surface` by Hansuebsai et al., in Pulp Technology and Industry, Aug., 1987, pp. 563-573.
`A Method to Measure Variations in Surface and Diffuse Reflectants of Printed and Unprinted Paper Samples` by Bryntse et al., in Tappi, Apr. 1976, vol. 59, No. 4, pp. 102 to 106.

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