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Ionization Chamber Arrays
As an alternative solution to conventional ionization chambers in traversing measuring systems we offer multi cell ionization chambers with cell sizes of 5 -15 mm. In combination with a line source these chambers not only provide a 100% coverage of the cross profile, but in addition allow the detection of local faults and the measurement of differences in the coating processes at the same time.
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- Measuring principle
- ICW versus traversing Measurements
- Differential Measurements
Measuring principle
Instantaneous Cross Web Method (ICW)
The ICW method is a specific kind of radiometric measurement. A line radiator is used as radiation source.
The detector is an ionisation chamber array and divided into several measuring zones.
The measuring information is available for every measuring zone immediately and for alle measuring zones simultaneously.
The cross profil of the basis weight distribution is continuously recorded with the ICW method.
ICW versus traversing Measurements
Comparison to traversing Measurements
When using a traversing detector only a small part of the material web is measured while the ICW- method allows a 100 percent coverage of the cross profile.
Local alterations of the basis weight and defects can only be detected by the full recording of the material web.
The measurement with the ICW- method results in a more accurate mapping of deviations because of its high resolution and constant local allocation.
Differential Measurements
Differentiation Measurement - 1 Measuring Point
For every measuring zone the current total basis weight in the measuring gap will be recorded.
With suitable coating geometry - like edge strips without mass - it is possible to determine the basis weight of the base material from the according measuring zones. In the other measuring zones the total basis weight of base material and coating is measured. From the difference the basis weight of the coating is determined.
By using further measuring points it is possible to measure multible coatings.