Senfit Oy

Metso Paper Inc.

Jarmo Karhu

Pekka Jakkula

Kari Luostarinen

Taavi Hirvonen

Matti Limingoja

Juha Heikkinen

Taisto Soikkeli

Olavi Hyry

For measuring the water content of a web in the wire section of a paper machine, at least one radiofrequency-operated resonator sensor forms an electric near field, in which a web affects the resonance frequency of each resonator sensor. The water content of the web is measured as a function of the resonance frequency of each resonator sensor in a measuring unit.

Method and measuring instrument for measuring water content

An object to be measured is measured using microwave radiation. Oscillation energy is generated by means of a feedback coupled active unit. The solution involves generating resonance into at least one oscillator, each oscillator comprising at least one open resonator, each resonator being coupled to at least one active unit, by using the object to be measured as a functional part of the resonator, the object to be measured causing a resonance frequency dependent on the location of a surface of the object to be measured to be generated in each oscillator. A measurement part determines at least one characteristic of the object to be measured on the basis of the resonance frequency of each oscillator.

Method for microwave measurement, measuring device and oscillator

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Oulu, Finland

Jarmo Karhu