Measuring device

A device for measuring at least one property of a fiber web, comprising:

• a plurality of movable measuring probes, at least one of said plurality of movable measuring probes being provided on each side of the fiber web, each of said plurality of movable measuring probes being pressed against the fiber web, said plurality of movable measuring probes forming at least one respective air pad on each said side of the fiber web;
• at least one element for measuring said at least one respective air pad on said each side of the fiber web;
• at least one property sensor being one of arranged on at least one of said movable measuring probes supported by at least one said respective air pad and fitted to at least one of said movable measuring probes supported by at least one said respective air pad;
• and
• at least one optical gloss sensor arranged on each side of the fiber web.

A device for measuring at least one property of a fiber web, comprising:

• a plurality of movable measuring probes, at least one of said plurality of movable measuring probes being provided on each side of the fiber web, each of said plurality of movable measuring probes being pressed against the fiber web, said plurality of movable measuring probes forming at least one respective air pad on each said side of the fiber web;
• at least one element for measuring said at least one respective air pad on said each side of the fiber web;
• at least one property sensor being one of arranged on at least one of said movable measuring probes supported by at least one said respective air pad and fitted to at least one of said movable measuring probes supported by at least one said respective air pad;
• at least one optical gloss sensor;
• and
• a light source providing a light beam being divided into a measuring beam and a reference beam, said reference beam passing directly through a source window and a receiving window to a separate reference detector.

A device for measuring at least one property of a fiber web, comprising:

• a plurality of movable measuring probes, at least one of said plurality of movable measuring probes being provided on each side of the fiber web, each of said plurality of movable measuring probes being pressed against the fiber web, said plurality of movable measuring probes forming at least one respective air pad on each said side of the fiber web;
• at least one element for measuring said at least one respective air pad on said each side of the fiber web;
• at least one property sensor being one of arranged on at least one of said movable measuring probes supported by at least one said respective air pad and fitted to at least one of said movable measuring probes supported by at least one said respective air pad;
• at least one optical gloss sensor;
• and
• a light source being associated with a respective said gloss sensor, said light source including a white light emitting diode.

A device for measuring at least one property of a fiber web, comprising:

• a plurality of movable measuring probes, at least one of said plurality of movable measuring probes being provided on each side of the fiber web, each of said plurality of movable measuring probes being pressed against the fiber web, said plurality of movable measuring probes forming at least one respective air pad on each said side of the fiber web;
• at least one element for measuring said at least one respective air pad on said each side of the fiber web;
• at least one property sensor being one of arranged on at least one of said movable measuring probes supported by at least one said respective air pad and fitted to at least one of said movable measuring probes supported by at least one said respective air pad;
• and
• at least one optical formation sensor.

A device for measuring at least one property of a fiber web, comprising:

• a plurality of movable measuring probes, at least one of said plurality of movable measuring probes being provided on each side of the fiber web, each of said plurality of movable measuring probes being pressed against the fiber web, said plurality of movable measuring probes forming at least one respective air pad on each said side of the fiber web;
• at least one element for measuring said at least one respective air pad on said each side of the fiber web;
• and
• at least one property sensor being one of arranged on at least one of said movable measuring probes supported by at least one said respective air pad and fitted to at least one of said movable measuring probes supported by at least one said respective air pad;
• and
• at least one optical property sensor, said at least one optical property sensor measuring a surface roughness of the fiber web;
• said at least one optical property sensor is at least one optical surface roughness sensor with both a light emitting diode source and a lens optic in order to measure a surface topography on a basis of a measure of a size of a focal spot on a surface of the fiber web.

A device for measuring a paper roughness of a fiber web, comprising:

• a plurality of movable measuring probes, at least one of said plurality of movable measuring probes being provided on each side of the fiber web, each of said plurality of movable measuring probes being pressed against the fiber web, said plurality of movable measuring probes forming at least one respective air pad on each said side the fiber web having an air pad thickness;
• at least one element for measuring said air pad thickness;
• at least one element for measuring a flow into said at least one respective air pad,
• at least one element for measuring an air temperature in order to determine a viscosity of air,
• at least one force element for compressing said at least one respective air pad against the fiber web,
• at least one element for calculating a flow resistance on a basis of said air pad thickness,
• said flow, said air temperature and a force of said compressing said at least one respective air pad against the fiber web, and
• at least one element for calculating the paper roughness on a basis of a flow resistance.

A device for measuring at least one paper property of a fiber web, comprising:

• a plurality of movable measuring probes, at least one of said plurality of movable measuring probes being provided on each side of the fiber web, each of said plurality of movable measuring probes being pressed against the fiber web, said plurality of movable measuring probes forming at least one respective air pad on each said side of the fiber web;
• a radiation source on one said side of the fiber web, said radiation source including a beta source for a grammage measurement;
• and
• a radiation detector on another said side of the fiber web for measuring the at least one paper property.

A device for measuring at least one paper property of a fiber web, comprising:

• a plurality of movable measuring probes, at least one of said plurality of movable measuring probes being provided on each side of the fiber web, each of said plurality of movable measuring probes being pressed against the fiber web, said plurality of movable measuring probes forming at least one respective air pad on each said side of the fiber web;
• a radiation source on one said side of the fiber web;
• and
• a radiation detector on another said side of the fiber web for measuring the at least one paper property, said radiation source includes a radiation beam, and a shutter associated with said radiation source, said beam is interrupted by said shutter which is pushed over said radiation source when said plurality of movable measuring probes are drawn back.

A device for measuring at least one paper property of a fiber web, comprising:

• a plurality of movable measuring probes, at least one of said plurality of movable measuring probes being provided on each side of the fiber web, each of said plurality of movable measuring probes being pressed against the fiber web, said plurality of movable measuring probes forming at least one respective air pad on each said side of the fiber web;
• a radiation source on one said side of the fiber web;
• and
• a radiation detector on another said side of the fiber web for measuring the at least one paper property, said radiation source includes a radiation beam, said radiation beam is interrupted by said radiation source being moved away from at least one of said plurality of movable measuring probes into a shielded position when said at least one of said plurality of movable measuring probes is drawn back from the fiber web.

A device for measuring at least one paper property of a fiber web, comprising:

• a plurality of movable measuring probes, at least one of said plurality of movable measuring probes being provided on each side of the fiber web, each of said plurality of movable measuring probes being pressed against the fiber web, said plurality of movable measuring probes forming at least one respective air pad on each said side of the fiber web;
• a radiation source on one said side of the fiber web, said radiation source includes a radiation beam;
• a radiation detector on another said side of the fiber web for measuring the at least one paper property;
• and
• an x-ray tube and a plurality of x-ray filters which can be inserted serially into said radiation beam in order to measure an x-ray transmission in any of a plurality of x-ray spectra and to determine at least one of an ash composition and a total ash content of one of a sheet and the fiber web.

A device for measuring at least one paper property of a fiber web, comprising:

• a plurality of movable measuring probes, at least one of said plurality of movable measuring probes being provided on each side of the fiber web, each of said plurality of movable measuring probes being pressed against the fiber web, said plurality of movable measuring probes forming at least one respective air pad on each said side of the fiber web;
• a radiation source on one said side of the fiber web;
• and
• a radiation detector on another said side of the fiber web for measuring the at least one paper property, at least one said respective air pad having a greater thickness than another of said at least one respective air pad.

A device for measuring at least one paper property of a fiber web, comprising:

• a plurality of movable measuring probes, at least one of said plurality of movable measuring probes being provided on each side of the fiber web, each of said plurality of movable measuring probes being pressed against the fiber web, said plurality of movable measuring probes forming at least one respective air pad on each said side of the fiber web;
• a radiation source on one said side of the fiber web;
• and
• a radiation detector on another said side of the fiber web for measuring the at least one paper property, said plurality of movable measuring probes are pressed against the fiber web with a plurality of unequal forces.

A device for measuring at least one paper property of a fiber web, comprising:

• a plurality of movable measuring probes, at least one of said plurality of movable measuring probes being provided on each side of the fiber web, each of said plurality of movable measuring probes being pressed against the fiber web, said plurality of movable measuring probes forming at least one respective air pad on each said side of the fiber web;
• a radiation source on one said side of the fiber web;
• and
• a radiation detector on another said side of the fiber web for measuring the at least one paper property, wherein a thickness of a total gap between said plurality of movable measuring probes is kept constant by way of a feedback from at least one of a plurality of compressed air measurements, a plurality of appropriate distance measurements and a plurality of thickness measurements.