Valmet Automation Oy

Metso Automation Oy

Pekka Suopajärvi

Markku Mäntylä

Antti Heikkinen

Jussi Tenhunen

Marko Toskala

Jussi Graeffe

Heimo Keränen

Lauri Kurki

Karri Niemelä

Tero O Kokko

Janne Paaso

Mikko V Heikkilä

Markku MÄNTYLÄ

Tero Kokko

A measurement apparatus of a moving paper web, includes an optical radiation source that outputs optical radiation toward a scattering element of the measurement apparatus. The scattering element scatters the optical radiation, and a transmitting surface of the scattering element directs the optical radiation in a scattered manner toward the moving paper web. A distance between said transmitting surface of the scattering element and a surface of the paper web is known, and the transmitting surface and a detector of the apparatus are on opposite sides of the paper web. The detector receives at least a part of the optical radiation, which is side-scattered from the moving paper web. The detector determines a moisture value and a dry weight of the paper web on the basis of spectral information on the received optical radiation and the known distance.

Measurement apparatus and method of paper web

Optical multi-channel measurement unit for a process measurement includes first ends for receiving optical radiation from the optical radiation source, and second ends for outputting the optical radiation for illuminating the at least one object. Optical detectors receive optical radiation from at least one measurement channel via at least one optical filter and convert an intensity of the optical radiation to an electrical signal. A movement mechanism causes, for filtering the wavelengths of the optical radiation propagating between detectors and the optical measurement channels through the optical filters, at least one of the following: movement inside at least one optical filter and movement between the filters and the detectors.

Optical multi-channel measurement unit, optical multi-channel detector unit and a measurement method for measuring a property of an object

One measuring part of a traversing measuring unit measures at least one characteristic of a web with a first radiation type from a plurality of measuring locations during a traversing movement at successive moments in time. At least two measuring parts of an array measuring unit measure at least one characteristic of the web with another radiation type during each traversing movement at a plurality of different moments in time by directing the measurement to a plurality of measuring locations in the web at each moment in time. A signal processing unit is arranged to estimate at least one characteristic measured by the traversing measuring unit with at least one measurement of the array measuring unit.

Web measurement

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Oulu, Finland

Pekka Suopajärvi