Device for testing flat materials
AssigneeVacutec Messtechnik GmbH
InventorsChristian Feige, Franz-Josef Urban, Steffen Hildebrandt
Life of this patent
Estimating the term…
Abstract
A device for testing flat materials during production of material webs has a radiation source from which radiation passes through the material under investigation, residual radiation on another side of the material being detected by a gas-filled ionization detector. The detector arrangement has a plurality of interconnected measurement chambers provided with collector electrodes and arranged inside a common housing. The measurement chambers can together be evacuated and filled with an ionizable gas. Each of the measurement chambers is allocated its own radiation inlet window. The radiation source is allocated to the measurement chamber and has a linear radiation distribution.
Claims29
An apparatus for checking weights per unit area during production of a sheet of material having first and second sides opposite one another, comprising:
- a source of radiation disposed on one side of a path of travel of the sheet of material to irradiate a width of said first side of the sheet of material with a linear distribution of radiation;
- a detector assembly disposed on another side of said path of travel of the sheet of material and having a common housing with a cover and a plurality of measurement chambers disposed in alignment with said source of radiation and to extend over the width of the sheet of material facing said second side of the sheet of material to receive radiation passing through the sheet of material, each of said measurement chambers being bounded by wall electrodes with a collector electrode therebetween;
- said measurement chambers being communicated to one another to permit joint evacuation and filling with ionizable gas;
- and
- said cover defining individual radiation entry windows respectively for each of said measurement chambers.
An apparatus for checking weights per unit area during production of a sheet of material having first and second sides opposite one another, comprising:
- a source of radiation disposed on one side of a path of travel of the sheet of material to irradiate a width of said first side of the sheet of material with a linear distribution of radiation;
- a detector assembly disposed on another side of said path of travel of the sheet of material and having a common housing with a plurality of measurement chambers disposed in alignment with said source of radiation and to extend over the width of the sheet of material facing said second side of the sheet of material to receive radiation passing through the sheet of material, each of said measurement chambers being bounded by wall electrodes with a collector electrode therebetween;
- said measurement chambers being communicated to one another to permit joint evacuation and filling with ionizable gas;
- and
- each of said measurement chambers having a radiation entry window of a shape corresponding to a shape of a cross section of measurement chambers taken parallel to said radiation entry windows.
An apparatus for checking weights per unit area during production of a sheet of material having first and second sides opposite one another, comprising:
- a source of radiation disposed on one side of a path of travel of the sheet of material to irradiate a width of said first side of the sheet of material with a linear distribution of radiation;
- a detector assembly disposed on another side of said path of travel of the sheet of material and having a common housing with a plurality of measurement chambers disposed in alignment with said source of radiation and to extend over the width of the sheet of material facing said second side of the sheet of material to receive radiation passing through the sheet of material, each of said measurement chambers being bounded by wall electrodes with a collector electrode therebetween;
- said measurement chambers being communicated to one another to permit joint evacuation and filling with ionizable gas;
- and
- each of said measurement chambers having a radiation entry window of circular shape and said measurement chambers having an angular construction.
An apparatus for checking weights per unit area during production of a sheet of material having first and second sides opposite one another,comprising:
- a source of radiation disposed on one side of a path of travel of the sheet of material to irradiate a width of said first side of the sheet of material with a linear distribution of radiation;
- a detector assembly disposed on another side of said path of travel of the sheet of material and having a common housing with a plurality of measurement chambers disposed in alignment with said source of radiation and to extend over the width of the sheet of material facing said second side of the sheet of material to receive radiation passing through the sheet of material each of said measurement chambers being bounded by wall electrodes with a collector electrode therebetween;
- said measurement chambers being communicated to one another to permit joint evacuation and filling with ionizable gas;
- and
- said measurement chamber being disposed next to one another in at least two rows wherein ones of said measurement chambers of a first row of said at least two rows are offset from other ones of said measurement chambers of a second row of said at least two rows.
An apparatus for checking weights per unit area during production of a sheet of material having first and second sides opposite one another, comprising:
- a source of radiation disposed on one side of a path of travel of the sheet of material to irradiate a width of said first side of the sheet of material with a linear distribution of radiation;
- a detector assembly disposed on another side of said path of travel of the sheet of material and having a common housing with a plurality of measurement chambers disposed in alignment with said source of radiation and to extend over the width of the sheet of material facing said second side of the sheet of material to receive radiation passing through the sheet of material, each of said measurement chambers being bounded by wall electrodes with a collector electrode therebetween and having a radiation entry window;
- said measurement chambers being communicated to one another to permit joint evacuation and filling with ionizable gas;
- said source of radiation being an isotope source extending over all said measurement chambers;
- and
- a collimator disposed between said detector assembly and said path of the sheet of material, said collimator having openings with a cross section smaller than a cross section of the radiation entry windows.
Dependencies are inferred from the claim text.