Web inspecting method

Details Web inspecting method Web inspecting method

1990-01-19

1991-09-10

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250563, 250572, 356431, G01N 2189

Patent

active

050476408

ABSTRACT:
A web e.g. a fibre web as used in the manufacture of textiles is inspected e.g. for thickness uniformity or the like by transillumination, where the web is subject to ambient illumination, the transillumination being effected in modulated fashion whereby to distinguish measuring illumination from ambient illumination. Modulation may be effected by time-chopping a beam or by a narrow spectral band filter to improve signal-to-noise ratio.

REFERENCES:
patent: 4103177 (1978-07-01), Sanford et al.
patent: 4224513 (1980-09-01), Casey et al.
patent: 4402609 (1983-09-01), Fetzer et al.
patent: 4631408 (1986-12-01), Zelmanovic et al.
patent: 4715717 (1987-12-01), Evans
patent: 4733080 (1988-03-01), Brunnschweiler et al.
patent: 4879471 (1989-11-01), Dahlquist
patent: 4937449 (1990-06-01), Kreuzer et al.

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