Roller assembly having pre-aligned for on-line thickness measure

Details Roller assembly having pre-aligned for on-line thickness measure Roller assembly having pre-aligned for on-line thickness measure

1997-07-11

1998-12-15

Font, Frank G.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356382, 356345, G01B 902

Patent

active

058502874

ABSTRACT:
An apparatus for measuring the thickness of a film on a production line or the like. The apparatus includes a moveable member in contact with the film. The moveable member rotates about a fixed member and includes a transparent region. The apparatus also includes an optical probe attached to the fixed member. The optical probe has an optical fiber for coupling a light signal to the film through the transparent region of the moveable member and for returning light reflected from the film to a receiver for determining the thickness of the film. The optical probe may also include a lens assembly for imaging the light signal onto the film and imaging the reflected light signals back into the optical probe. The optical probe may also include a partially reflecting reference reflector for simplifying the analysis of multi-layer films.

REFERENCES:
patent: 4937449 (1990-06-01), Kreuzer et al.
patent: 5731876 (1998-03-01), Venkatesh et al.

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