SHADOW is a readily used direct measuring system for the systems in which films up to 3,5mm are produced.
SHADOW works on the principle of laser occlusion over a measuring roller. It is a direct measuring system, and it is, therefore, independent of the properties of the film.
The sensor head contains 2 sensors: a laser shading sensor and an eddy current sensor. The shading sensor sends laser beams over the measuring roller and the film to be measured. A receiver (line scan camera) detects the shading by the film and by the roller. The eddy current sensor permanently measures the propriety of the sensor head to the measuring roller. The result of both measurements gives directly the thickness of the film.
No calibration is necessary. The measurment is independent of film properties.
|sensor system||laser occlusion/eddy current|
|Max. thickness||3,5 mm|
|measured cleaving||5,5 mm|
|sensor diameter||30 mm|
|measuring spot diameter||0,5 mm|
|sensor resolution||0,5 µm|
|accuracy||≤ 3,0 μm|
|measuring speed||10 – 300 mm/s adjustable|
|process speed||10 – 500 mm/s adjustable|
|diameter of the reference roller||200 mm|