News Column

Patent Issued for Moisture Measurement

May 28, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Alexandria, Virginia, VerticalNews journalists report that a patent by the inventors Jakkula, Pekka (Oulu, FI); Seppanen, Markku (Kuluntalahti, FI); Vuolteenaho, Mikko (Kiiminki, FI), filed on November 3, 2010, was published online on May 13, 2014.

The patent's assignee for patent number 8725284 is Senfit Oy (Oulu, FI).

News editors obtained the following quote from the background information supplied by the inventors: "The invention relates to a measurement device, a control system, and a measurement and control method.

"Measurement of moisture of materials of natural origin is important e.g. in energy production plants burning biomaterials. Measurement of moisture of materials is necessary also in other processes. Examples of such processes include pulp cooking processes and Thermo Mechanical Pulp (TMP) processes wherein wood chips are refined. Furthermore, moisture may be measured e.g. from various minerals.

"Radio frequency electromagnetic radiation may be used for measuring moisture of various materials. Moisture determination is, however, problematic. Owing e.g. to the dielectric anisotropy, density, shape and size and/or non-homogeneity of pieces or samples of the material to be measured, a measurement result is highly direction-dependent. Such problems impede measurement and make measurement by radio frequency electromagnetic radiation inaccurate and unreliable."

As a supplement to the background information on this patent, VerticalNews correspondents also obtained the inventors' summary information for this patent: "An object of the invention is to provide an improved solution for measuring moisture. This is achieved by a measurement device for measuring moisture from a direction-dependent material by electromagnetic radiation. The measurement device comprises an electromagnetic field tuning and detection apparatus configured to generate in to a material space and in at least two different directions radio frequency electromagnetic fields adapted to resonate in different directions at a different frequency on the basis of the material insertable into the material space; and a signal processing unit configured to determine a moisture content of the material on the basis of a resonance frequency of each electromagnetic field and quality of each resonance in different directions.

"The invention also relates to a control system for controlling a process which receives a direction-dependent material whose moisture content varies. The control system comprises one or more electromagnetic field tuning and detection apparatuses adapted to be placed on each material feed line of the process, the electromagnetic field tuning and detection apparatus being configured to generate, at least in two different directions, radio frequency electromagnetic fields adapted to resonate in different directions at a different frequency on the basis of a material insertable into a material space; a signal processing unit configured to determine a moisture content of the material on each feed line on the basis of a resonance frequency of each electromagnetic field and quality of each resonance in each direction; and a controller configured to control the process on the basis of each determined moisture content on each feed line.

"The invention also relates to a method of measuring moisture from a direction-dependent material by radio frequency electromagnetic radiation. The method further comprises generating at least in two different directions radio frequency electromagnetic fields that resonate in different directions at a different frequency on the basis of the material insertable into a material space; and determining a moisture content of the material on the basis of a resonance frequency of each electromagnetic field and quality of each resonance in orthogonal directions.

"The invention still further relates to a method of controlling a process which receives a direction-dependent material whose moisture content varies. The method further comprises generating in to a measurement chamber at least in two different directions radio frequency electromagnetic fields that resonate in different directions at a different frequency on the basis of the material insertable into the material space; determining the moisture content of the material on the basis of a resonance frequency of each electromagnetic field and quality of each resonance in different directions; and controlling the process on the basis of each determined moisture content on each feed line.

"Preferred embodiments of the invention are described in the dependent claims.

"The solution according to the invention enables several advantages to be achieved. The direction-dependence of measurement is eliminated or substantially reduced and the measurement becomes reliable."

For additional information on this patent, see: Jakkula, Pekka; Seppanen, Markku; Vuolteenaho, Mikko. Moisture Measurement. U.S. Patent Number 8725284, filed November 3, 2010, and published online on May 13, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=34&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1664&f=G&l=50&co1=AND&d=PTXT&s1=20140513.PD.&OS=ISD/20140513&RS=ISD/20140513

Keywords for this news article include: Senfit Oy, Electronics, Electromagnet, Signal Processing.

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Source: Electronics Newsweekly


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