Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1984-09-25
1987-07-21
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
73159, 324 61R, 427 10, G01B 708, G01B 710, G01R 3312
Patent
active
046821058
ABSTRACT:
Arrangement for electrically measuring coating thickness on travelling webs in vacuum deposition apparatus. A plurality of sensors are arranged with respect to a roller around which the web runs each with a spatially limited measuring region. These produce signals which represent a measure for the coating thickness. The signals can be indicated by an evaluating circuit. To avoid a falsification of the measuring signals as a result of the tendency of the travelling web to flutter, according to the invention the sensors (3,4,5) are arranged in the roller (1) against its surface and are distributed lengthwise of the roller. The sensors are connected to the evaluating circuit (7) by a transfer device (28). Preferably, the sensors rotate with the roller.
REFERENCES:
patent: 2703384 (1955-01-01), Rendel
patent: 3037163 (1962-05-01), Wiprud
patent: 3258686 (1966-06-01), Selgin
patent: 3704412 (1972-11-01), Lundstrom
patent: 3823371 (1974-07-01), Lippke
patent: 3949856 (1976-04-01), Ulber et al.
patent: 4356714 (1982-11-01), Quehen
Leybold-Heraeus GmbH
Strecker Gerard R.
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