Radiant energy – Invisible radiant energy responsive electric signalling – With means to inspect passive solid objects
Patent
1992-02-25
1993-08-03
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
With means to inspect passive solid objects
250308, 2503581, 2503591, 2504961, 2504971, 2504981, G01N 2316, G21F 5015
Patent
active
052331954
ABSTRACT:
Characteristics of moving webs are measured using a radiation source shutter which is rotatably movable between an opened-shutter position and a closed-shutter position and structured to permit access to the radiation source in the closed-shutter position. The source is configured to produce a fan-shaped radiation beam which passes through the web to a detector. The sizing of the fan-shaped beam and the detector together with the spacing the source and the detector are such that the beam width is substantially less than the detector while its length is greater than the detector. This novel beam shaping, detector arrangement provides composition insensitivity, increases solid beam angle and superior streak detection by aligning the beam length dimension with the direction of web movement. Alignment insensitivity is obtained by tuning the radiation beam using concentric rings or crossed strips of material which is semi-transparent to the radiation to compensate for geometric characteristics of the radiation source/beam and the detector. Air within an open portion of a measuring column extending between the radiation source and detector is conditioned and also used to condition electronics associated with the detector. The gap between the radiation source and the detector is monitored and used to compensate for variations in the measuring column air mass due to gap variations.
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Hellstrom Ake A.
Muller Wim
Reid Alan M.
Sturm Steven P.
ABB Process Automation Inc.
Hannaher Constantine
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