NO943992L - Meter and method for measuring in situ the electromagnetic properties of different process materials using characterization and analysis of boundary frequencies - Google Patents

Meter and method for measuring in situ the electromagnetic properties of different process materials using characterization and analysis of boundary frequencies

Info

Publication number
NO943992L
NO943992L NO943992A NO943992A NO943992L NO 943992 L NO943992 L NO 943992L NO 943992 A NO943992 A NO 943992A NO 943992 A NO943992 A NO 943992A NO 943992 L NO943992 L NO 943992L
Authority
NO
Norway
Prior art keywords
frequency
boundary
determined
characterization
situ
Prior art date
Application number
NO943992A
Other languages
Norwegian (no)
Other versions
NO943992D0 (en
Inventor
Buford Randall Jean
F Lynn Whitehead
Gary L Warren
Original Assignee
Thermedics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US07/871,339 external-priority patent/US5331284A/en
Priority claimed from US08/045,854 external-priority patent/US5455516A/en
Application filed by Thermedics Inc filed Critical Thermedics Inc
Publication of NO943992D0 publication Critical patent/NO943992D0/en
Publication of NO943992L publication Critical patent/NO943992L/en

Links

Landscapes

  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

Prosessmaterialet fares gjennom en frekvens- følsom målecelle. Prosessmaterialet utsettes for elektromagnetisk energi som frembringes av en flerfrekvens-kilde. Flerfrekvens-kilden styres av en prosessor for å variere signalfrekvensen slik at det frembringes et utgangssignal, som har en tydelig frekvensrespons-karakteristikk. Utgangssignalet detekteres og omformes til en digital representa- sjon. Den digitale representasjon av signalet analyseres for å bestemme grensefrekvensen. Skarpheten av grensekarakteristikken bestemmes ved hjelp av matematiske logaritmer. Fra den målte grensefrekvens og skarpheten av grensekarakteristik- ken bestemmes dielektrisitetskonstanten og kondukti- viteten til materialet. Ved å bruke lagrede kali- breringsdata eller ligninger beregnes og fremvises den ønskede materialegenskap, for eksempel materia- lets fuktighetsinnhold. Ved å bruke passbånddemp- ningen kan videre materialets tetthet bestemmes.The process material is passed through a frequency-sensitive measuring cell. The process material is subjected to electromagnetic energy generated by a multi-frequency source. The multi-frequency source is controlled by a processor to vary the signal frequency to produce an output signal which has a distinct frequency response characteristic. The output signal is detected and converted into a digital representation. The digital representation of the signal is analyzed to determine the boundary frequency. The sharpness of the boundary characteristic is determined by mathematical logarithms. From the measured boundary frequency and the sharpness of the boundary characteristic, the dielectric constant and the conductivity of the material are determined. Using stored calibration data or equations, the desired material property is calculated and displayed, such as the moisture content of the material. Furthermore, by using the passband attenuation, the density of the material can be determined.

NO943992A 1992-04-21 1994-10-20 Meter and method for measuring in situ the electromagnetic properties of different process materials using characterization and analysis of boundary frequencies NO943992L (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US07/871,339 US5331284A (en) 1992-04-21 1992-04-21 Meter and method for in situ measurement of the electromagnetic properties of various process materials using cutoff frequency characterization and analysis
US08/045,854 US5455516A (en) 1992-04-21 1993-04-09 Meter and method for in situ measurement of the electromagnetic properties of various process materials using cutoff frequency characterization and analysis
PCT/US1993/003756 WO1993021516A1 (en) 1992-04-21 1993-04-21 Meter and method for in situ measurement of the electromagnetic properties of various process materials using cutoff frequency characterization and analysis

Publications (2)

Publication Number Publication Date
NO943992D0 NO943992D0 (en) 1994-10-20
NO943992L true NO943992L (en) 1994-12-20

Family

ID=27366768

Family Applications (1)

Application Number Title Priority Date Filing Date
NO943992A NO943992L (en) 1992-04-21 1994-10-20 Meter and method for measuring in situ the electromagnetic properties of different process materials using characterization and analysis of boundary frequencies

Country Status (1)

Country Link
NO (1) NO943992L (en)

Also Published As

Publication number Publication date
NO943992D0 (en) 1994-10-20

Similar Documents

Publication Publication Date Title
CA2118404A1 (en) Meter and Method for in Situ Measurement of the Electromagnetic Properties of Various Materials Using Cutoff Frequency Characterization and Analysis
AU2006289050B2 (en) Method for the determination of the stresses occurring in wood when drying
EP1969357B1 (en) Measurement of ash composition using scanning high voltage x-ray sensor
CA1226898A (en) Method and apparatus for measuring soil salinity
CN103439365A (en) Device and method for detecting water content of fresh tobacco leaves
AU2001252798A1 (en) A method of estimating timber stiffness profiles
US4310758A (en) Method for evaluating moisture tensions of soils using spectral data
Calvet et al. Microwave dielectric properties of a silt-loam at high frequencies
NO943992L (en) Meter and method for measuring in situ the electromagnetic properties of different process materials using characterization and analysis of boundary frequencies
DE69740167D1 (en) METHOD FOR ANALYZING PROPERTIES OF A MOVABLE WOOD OBJECT, SUCH AS e.g. A TREE TRUNK
Kim et al. Determination of moisture content in a deformable soil using time‐domain reflectometry (TDR)
Hauschild et al. Moisture measurement in masonry walls using a non-invasive reflectometer
Hori et al. A detailed density profile of the Dome Fuji (Antarctica) shallow ice core by X-ray transmission method
L’Espérance et al. Outdoor sound propagation in the presence of atmospheric turbulence: Experiments and theoretical analysis with the fast field program algorithm
Okarnura et al. New method for moisture content measurement using phase shifts at two microwave frequencies
Sinclair et al. A comparison of three methods for determining elastic constants of wood
EP1315960B1 (en) A method and device for measuring moisture content during optimising of a drying process
US3954002A (en) Method for calibrating moisture content measuring instruments
Zhang et al. A density-independent method for high moisture content measurement using a microstrip transmission line
JP2662406B2 (en) Data collection device for partial discharge measurement device
Malicki et al. Dielectric determination of moisture of wood using time domain reflectometry
Nute et al. A rapid method for studying acoustic behaviour
Eskelinen et al. Characterizing wood by microwaves
Tian et al. Study on influence and compensation for soil compactness on volumetric water content measurement
Kharkovsky et al. Measurement and monitoring of microwave reflection and transmission properties of cement-based materials for propagation modeling