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789results about "Moisture content investigation using microwaves" patented technology
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System and method for monitoring water content or other dielectric influences in a medium
Owner:BATTELLE ENERGY ALLIANCE LLC +1
Apparatus and method for microwave determination of least one physical parameter of a substance
InactiveUS20040239338A1High sensitivityImprove accuracySamplingResistance/reactance/impedenceRest positionSalt content
A method and an apparatus is described to measure at least one physical parameter of a substance such as moisture and salt content. This is done by transmitting a microwave beam through the material to be measured and detect only a reflection of a predetermined polarity of the transmitted waves. To accomplish this a polarizing plate is used so that only cross-polarised microwaves, which pass through the substance are detected and the co-polar reflections from surrounding structures are excluded. The object can either be moving as on a conveyer belt or in a rest position.
Owner:INTELSCAN ORBYLGJUTAEKNI EHF
Flow meter
ActiveUS20050188771A1Specific gravity by measuring pressure differencesMaterial analysis by electric/magnetic meansLiquid stateDifferential pressure
A flow meter obtains the individual flow rates of gas, liquid hydrocarbons, and water in a predominantly gas-containing flowing fluid mixture. The flow meter comprises a water content meter (7) provides a signal representing a measure of the water content of said fluid. It also comprises a double differential pressure generating (3) and measuring (4) structure, denoted a DDP-unit (2), that provides two measurement signals (6A and 6B) representing two independent values of differential pressure (DP) in said fluid (1). In addition to the above, the meter also comprises a signal processing unit (8) having inputs (9A-C) for receiving the measurement signals and the water content signal, and a calculation module (10) which calculates values representing the volumetric flow rates of said gas, liquid hydrocarbons and water in said fluid.
Owner:ROXAR FLOW MEASUREMENT
Pavement material microwave density measurement methods and apparatuses
ActiveUS20050150278A1High degreeAccurate measurementElectric signal transmission systemsResistance/reactance/impedencePermittivityRoad surface
A method of obtaining a material property of a pavement material from a microwave field generally includes generating a microwave frequency electromagnetic field of a first mode about the pavement material. The frequency response of the pavement material in the electromagnetic field can be measured, such as by a network analyzer. The measurement of the frequency response permits correlating the frequency response to a material property of the pavement material sample, such as the density. A method of correcting for the roughness of a pavement material divides the pavement into a shallow layer and a deep layer. Two planar microwave circuits measure the permittivity of the shallow and deep layer. The permittivities are correlated to correct for roughness. An apparatus for obtaining the density of a pavement sample includes a microwave circuit and a network analyzer. The network analyzer measures the frequency response to determine the density of the pavement material.
Owner:TROXLER ELECTRONICS LAB INC
Liquid detection sensor and liquid detection apparatus
InactiveUS7049969B2Small and inexpensiveAccurate conditionDetection of fluid at leakage pointResistance/reactance/impedenceDielectricEngineering
A moisture detection sensor includes a resonant circuit composed of an antenna coil 53 and a capacitor C. A noncontact tag composed of covering materials 51 and 57 covers the resonant circuit. The capacitor C has a pair of electrodes 52 and 56 and a dielectric 55 interposed between the electrodes 52 and 56, and the covering material 57 contains a through-hole 57a that allows the liquid to infiltrate into the dielectric 55 from outside.
Owner:PANASONIC CORP
Flow meter for measuring fluid mixtures
ActiveUS7293471B2Specific gravity by measuring pressure differencesMaterial analysis by electric/magnetic meansDifferential pressureLiquid hydrocarbons
Owner:ROXAR FLOW MEASUREMENT
Moisture and density detector (MDD)
InactiveUS7068050B2Positive identificationPhase shift decreasesResistance/reactance/impedenceMoisture content investigation using microwavesCapacitancePhase shifted
A Moisture and Density Detector (MDD) provides a method and apparatus to determine the moisture content and / or density, as well as presence and location of anomalies, and / or wood type of any dielectric material for various purposes. This device is very useful in detecting the moisture content of wood and wood-based materials, such as that of lumber in a dry kiln prior to, during and / or following drying. The MDD passes a radio frequency signal and / or any other signal between opposed or adjacent capacitance electrodes and measures the signal strength and phase shift of the signal. The addition of phase shift and multiple frequencies improves the accuracy of the results.
Owner:MISSISSIPPI STATE UNIVERSITY
Pavement material microwave density measurement methods and apparatuses
A method of obtaining a material property of a pavement material from a microwave field generally includes generating a microwave frequency electromagnetic field of a first mode about the pavement material. The frequency response of the pavement material in the electromagnetic field can be measured, such as by a network analyzer. The measurement of the frequency response permits correlating the frequency response to a material property of the pavement material sample, such as the density. A method of correcting for the roughness of a pavement material divides the pavement into a shallow layer and a deep layer. Two planar microwave circuits measure the permittivity of the shallow and deep layer. The permittivities are correlated to correct for roughness. An apparatus for obtaining the density of a pavement sample includes a microwave circuit and a network analyzer. The network analyzer measures the frequency response to determine the density of the pavement material.
Owner:TROXLER ELECTRONICS LAB INC
Method of and apparatus for testing a first material for potential presence of second materials
A method of detecting impurities in a mass, such as detecting metallic and / or plastic particles in a stream of tobacco particles or filter material for tobacco smoke, includes the steps of moving the mass relative to a microwave field and / or vice versa, and analyzing the influence of the mass upon the microwave field. The analyzing step involves simultaneously measur- the actual values of a first and a second parameter of the microwave field, ascertaining the presence or absence of those changes of the parameters which are attributable to the presence of impurities in the mass, determining whether or not the changes are within an acceptable range, and generating signals for segregation of impurities-containing portions of the mass from the other portions when the changes are outside of the acceptable range.
Owner:HAUNI MASCHINENBAU AG
Methods and apparatus for electromagnetic signal polarimetry sensing
ActiveUS20130332115A1Amplifier modifications to reduce noise influenceDigital computer detailsPolarimetryRadio frequency signal
A system and method of identifying changes utilizing radio frequency polarization includes receiving a reflected and / or transmitted polarized radio frequency signal at a receiver, filtering, amplifying and conditioning the received signal, converting the received signal from an analog format to a digital format, processing the digital signal to elicit a polarization mode dispersion feature of the received signal, and comparing the polarization mode dispersion features to a known calibration to detect a change in a characteristic of the target object.
Owner:UNIV OF NOTRE DAME DU LAC
Reconfigurable frequency selective surfaces for remote sensing of chemical and biological agents
Owner:PENN STATE RES FOUND
Flow measurements
ActiveUS20100145636A1Resistance/reactance/impedenceVolume/mass flow by dynamic fluid flow effectResonanceMeasuring instrument
This invention relates to a measuring instrument for measurement of a flow (1) comprising—a dielectric resonator sensor (3) arranged in a pipeline (2), said resonator (3) having a surface (4) facing a flow volume,—a sensor drive unit (12) being coupled to said sensor (3) and which is adapted to provide a driving or excitation signal to said sensor (3) resulting in the excitation of an electromagnetic resonance in said sensor causing a fringing electromagnetic field (5) adjacent to said surface (4) facing said wet gas flow (1),—a recording unit (10) coupled to said sensor (3) and which is adapted to measure a resonance property of said sensor (3) while said wet gas flow (1) moves past said sensor surface (4), and—a processing unit (11) which is adapted to estimate a property of at least a part of said wet gas flow (1).
Owner:ROXAR FLOW MEASUREMENT
On-line instant measuring method and apparatus for oil-gas-water three phase flow quantity
The invention belongs to the metering technology category and the proposal is proposed to aim at overcoming the problems that the existing measuring facility is large and complicated in structure and difficult to realize online real-time measurement. A measuring facility of mixed fluid of oil, gas and water is composed of a vertical pipe section, a Venturi tube and a water content measuring device. The vertical pipe section is connected with a differential pressure transducer Delta P2, a pressure transducer P and a differential pressure transducer Delta P1. A cyclone and a sampling device are arranged at the position of the water content measuring device. A microwave or differential pressure type water content measuring meter is used. The cyclone throws the fluid toward the tube wall and can smoothly divert partial liquid through a sampling circular seam. Because the differential pressure function of a drainage tube can lead the liquid with the water content measured to smoothly return to a main tube, the stable liquid flow is formed, thus realizing real-time online measurement. The flow rate of each phase of the oil, gas and water can be obtained through further calculation of measured data according to a formula. The measuring facility and the measuring method are characterized by high precision, wide working range, low operating cost and stable performance and can reliably realize the real-time online measurement.
Owner:天津瑞吉德科技有限公司
Moisture measurement system for seed cotton or lint
InactiveUS7330034B1Resistance/reactance/impedenceMoisture content investigation using microwavesPhase detectorMaterial under test
A process for measuring the moisture content and the mass-moisture content of materials is presented that requires no air reference or calibration sequence. A microwave signal is split into a reference and a transmission signal, and the reference signal is applied directly to the phase detector, whereas the transmission signal is first transmitted through the sample before being presented to the other side of the phase detector. This measurement provides a phase-constant measurement that is due to the dielectric characteristics of the material under test. The system measures the material's phase-constant across a band of frequencies. The slope of the phase-constant versus frequency is then utilized to predict the density of the material which is then combined with the corrected phase-constant measurement to calculate the moisture content of the material.
Owner:US SEC AGRI
Systems and methods for non-destructively measuring calorie contents of food items
ActiveUS20130027060A1Resistance/reactance/impedenceMoisture content investigation using microwavesNon destructiveEngineering
Owner:HAIER US APPLIANCE SOLUTIONS INC
Microwave moisture analyzer: apparatus and method
InactiveUS6247246B1Reduce power consumptionWeighing by removing componentDrying solid materials with heatMicrowaveElectrical field strength
A toploading weighing instrumentality which determines loss on drying by a cylindrical microwave. The cylindrical cavity of the microwave includes a power supply, a magnetron, a power module operatively coupled between said power supply and said magnetron for driving said magnetron, a wave guide communicating with the magnetron and with a microwave containment chamber for delivering energy thereto, at least one microwave energy sensor for sensing microwave energy or magnetic and / or electric field strength within the chamber for controlling, inter alia, the loss on drying process of the sample being assayed and determining when the drying process is complete. A precision electronic balance is operatively disposed within the microwave chamber for allowing a specimen being assayed to be weighed. In addition, a ventilation chamber is provided for venting moisture from the microwave chamber. A processing unit and associated memory allows means for data acquisition, processing and storage of data from the power module driving the magnetron, the microwave energy sensor(s) for sensing magnetic and / or electric fields and the electronic balance for weighing the initial and final weights of the specimen for loss on drying moisture analysis. Both signaling the removal of microwave energy in the chamber.
Owner:DENVER INSTR
Gravimetric moisture measurement instrument
ActiveUS7851712B2Lower Level RequirementsPromote escapeWeighing apparatus testing/calibrationMaterial moisture contentMeasuring instrumentEngineering
Owner:METTLER TOLEDO GMBH
Method for sensor reader calibration
ActiveUS20140028327A1Mitigate for environmental parameterReduce the environmentMaterial analysis by electric/magnetic meansDiagnostic recording/measuringLoad circuitResonance
In one embodiment a method for sensor reader calibration comprising: performing a calibration of a sensor reader wherein the calibration comprises open circuit calibration, a short circuit calibration, and a load circuit calibration, or any combination thereof in any succession; enabling connection of a pickup coil to the sensor reader to measure a sensor response; and applying a baseline correction to the sensor response, wherein the baseline correction is obtained utilizing measurements from the calibration step. In a further embodiment, a method for sensor response calibration incorporating environmental correction comprising: measuring a first resonance impedance spectrum of the sensor with a first applied power to the pickup coil; measuring a second resonance impedance spectrum of the sensor with a second applied power to the pickup coil; and applying a correction to the sensor response corresponding to the respective measured first and second resonance impedance spectrum to mitigate for environmental parameters.
Owner:GENERAL ELECTRIC CO
Device for detecting compositions of coal on conveying belt in real time
InactiveCN101603929AX/gamma/cosmic radiation measurmentMoisture content investigation using microwavesSpectrum analyzerElement analysis
The invention discloses a device for detecting compositions of coal on a conveying belt in real time, which comprises an upper neutron source and an upper gamma ray detector which are arranged above the conveying belt and a lower neutron source and a lower gamma ray detector which are arranged below the conveying belt, wherein the upper neutron source and the upper gamma ray detector are fixed on an upper lead block seat; the lower neutron source and the lower gamma ray detector are fixed on a lower lead block seat; the outside of the upper lead block seat and the lower lead block seat is provided with a shielding layer; the upper neutron source faces the lower gamma ray detector, and the lower neutron source faces the upper gamma ray detector; and the upper gamma ray detector and the lower gamma ray detector are sequentially connected with a gamma spectrum analyzer, a coal element analysis processor and a coal industrial analysis processor. The device can adapt to the changes of coal types and coal layer thickness and shape on the conveying belt, and maintain stable detection performance index in industrial fields.
Owner:江苏广兆科技有限责任公司
Multiphase fluid characterization
ActiveUS7523647B2Accurate measurementGreat advantageMaterial analysis by electric/magnetic meansSpecific gravity using flow propertiesPermittivityPetroleum oil
Methods for determining and validating a first phase fraction of a gravitationally-separated multiphase fluid by conducting physical and electrical property measurements on samples of the fluid. The water content of crude petroleum oil is determined after the oil and water have begun to separate into phase layers such as occurs during un-agitated holding of the crude petroleum oil. A series of measurements of electrical properties such as permittivity and physical properties such as density is collected. The density minima can be used to generate hindsight determinations of average properties, such as the dry oil phase density, which in turn can be used to increase the accuracy of the water percentage in the oil determined by the permittivity and density methods. Flow weighted averages of water percentages by each method can be used to determine and validate the water content of the crude petroleum oil.
Owner:PHASE DYNAMICS
Method and apparatus for detecting deep soil humidity through microwave remote sensing
ActiveCN102735697ALarge-scale spatial and temporal distribution informationDynamic spatio-temporal distribution informationMoisture content investigation using microwavesSoil scienceLow frequency band
The invention discloses a method and an apparatus for detecting deep soil humidity through microwave remote sensing, and relates to the technology of microwave remote sensing. The method for detecting deep soil humidity through microwave remote sensing is provided by utilizing an object-penetrative property of microwave low-frequency bands and also disclosed is the apparatus for detecting deep soil humidity through microwave remote sensing. Backscattering coefficients of soils are tested. Soil humidity of different depth is obtained through inverting a deep soil scattering model and a soil dielectric model. A three dimensional image of the distribution of soil humidity in a tested area is formed. The working frequency of the apparatus is in the VHF / UHF band. Soil dielectric constants and humidity parameters of different types of soils in a depth of 0.1-10 m can be detected in a contactless and lossless manner.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI
Method for determining sandy soil moisture content based on low-frequency ground penetrating radar ground method
InactiveCN101915771AIncrease moisture contentMoisture shortcutTesting dielectric strengthMoisture content investigation using microwavesElectricitySoil science
The invention relates to a method for determining the sandy soil moisture content based on a low-frequency ground penetrating radar ground method, which comprises the determining steps of: collecting ground penetrating radar data by utilizing a together-midpoint method to ensure the travel time of airwaves and ground waves; collecting the radar wave information of a soil section by utilizing a constant spacing method; calculating the dielectric constant of soil; substituting parameters to a formula to obtain the dielectric constant of soil; calculating the water content of soil; substituting the obtained soil dielectric constant epsilon to the formula theta=-5. 3*102+2.92*10-2epsilon-5.5*10-4epsilon2+4.3*10-6epsilon3 to obtain the soil water content. The method for determining the sandy soil moisture content based on a low-frequency ground penetrating radar ground method is suitable to the measurement of the soil water content in farmlands and small river basins, has the advantages of convenience, quick operation, high accuracy and no destruction and is especially suitable to the water content determination of sandy soil.
Owner:INST OF SOIL SCI CHINESE ACAD OF SCI
Moisture and density detector (MDD)
InactiveUS20050040832A1Positive identificationSlow changeResistance/reactance/impedenceMoisture content investigation using microwavesCapacitancePhase shifted
A Moisture and Density Detector (MDD) provides a method and apparatus to determine the moisture content and / or density, as well as presence and location of anomalies, and / or wood type of any dielectric material for various purposes. This device is very useful in detecting the moisture content of wood and wood-based materials, such as that of lumber in a dry kiln prior to, during and / or following drying. The MDD passes a radio frequency signal and / or any other signal between opposed or adjacent capacitance electrodes and measures the signal strength and phase shift of the signal. The addition of phase shift and multiple frequencies improves the accuracy of the results.
Owner:MISSISSIPPI STATE UNIVERSITY
Microwave/infrared remote sensing image combined soil moisture inversion method
ActiveCN106226260AImproving the Accuracy of Moisture Remote Sensing RetrievalMake up for the shortcomings of low resolutionColor/spectral properties measurementsMoisture content investigation using microwavesSensing dataCorrelation coefficient
The invention relates to a microwave / infrared remote sensing image combined soil moisture inversion method. By combining the applicability characteristics of PDI (precipitation distance index) and VSWI (vegetation supply water index), a remote sensing monitoring model based on CDI (composite drought index) is established according to different ground surface vegetation coverages. The method comprises the following steps: obtaining the CDI result by using infrared remote sensing data, calculating the correlation coefficient between the CDI inversion result and microwave remote sensing data by combining the microwave remote sensing data, establishing a regression equation, carrying out image fusion while downscaling the microwave data, converting the CDI result reversed from the infrared data into true soil moisture value, and filling the infrared data null region with the microwave remote sensing data, thereby obtaining the complete high-resolution soil moisture product. The method is simple and practical, and enhances the wide-range soil moisture inversion efficiency.
Owner:WUHAN UNIV
Microwave moisture analyzer: apparatus and method
InactiveUS6092924AReduce power consumptionShorten drying timeMaterial thermal analysisMoisture content investigation using microwavesMicrowaveEngineering
A toploading weighing apparatus which determines weight loss for a sample by drying the sample in a cylindrical microwave with a specific structure.
Owner:DENVER INSTR
Radio Frequency System and Method for Monitoring Engine-Out Exhaust Constituents
ActiveUS20170211453A1Enhanced signalReduced measurement response timeTransmitters monitoringInternal combustion piston enginesRadio frequency signalEngineering
A radio frequency system and method for monitoring an engine-out exhaust emission constituent. The system comprises a housing containing the emission constituent, one or more radio frequency sensors extending into the housing and transmitting and receiving radio frequency signals, and a control unit for controlling the radio frequency signals and monitoring changes in the emission constituent based on changes in one or more parameters of the radio frequency signals. In one embodiment, the control unit measures a rate of change in one or more of the parameters of the radio frequency signals for monitoring a rate of change of the emission constituent including for example the emission rate, accumulation rate, and / or depletion rate of the emission constituent.
Owner:CTS CORP ELKHART
Radar remote sensing method for detecting distribution of water content in soil in depth direction
ActiveCN102621163AWave based measurement systemsMoisture content investigation using microwavesSoil scienceRadar
The invention which discloses a radar remote sensing method for detecting the distribution of the water content in soil in a depth direction relates to the radar remote sensing detection technology. The method comprises the following steps: 1, respectively adopting two modes of horizontal polarization and vertical polarization to measure the scattering field of the soil under multiple visual angle and multiple frequency observation; 2, filtering out components of direct waves in radar echoes; 3, scaling echo data; and 4, utilizing the scattering model and the dielectric constant of the soil to obtain the distribution of the water content in the soil in the depth direction. The radar remote sensing method for detecting the distribution of the water content in the soil in the depth direction of the invention allows the distribution of the water content in soil with the depth under the soil surface of 0-3m to be detected, and can be applied to ground, air and space base remote sensing monitoring platforms.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI
Method for measuring large-area soil humidity
InactiveCN101900692ALow costIncrease profitMoisture content investigation using microwavesGlobal Positioning SystemSignal source
The invention provides a method for measuring large-area soil humidity, which comprises the following step of: mounting a vertical polarized receiving antenna, a GPS (Global Positioning System) receiver and a computer for carrying out signal processing. The measuring process is carried out by utilizing the interference effect of a GPS signal and a reflecting signal thereof. By utilizing the widely existing GPS signal as a signal source, the method can be used for carrying out all-weather large-area measurement, has low cost and more further simplifies a receiving device by utilizing the interference effect.
Owner:WUHAN UNIV
Microwave radar moisture sensor
InactiveCN101706459AGuaranteed separation effectGuaranteed measurement efficiencyMoisture content investigation using microwavesTransceiverMoisture sensor
The invention relates to a microwave radar moisture sensor, in particular to a contact / non-contact medium continuous or point sensing type microwave radar moisture sensor. The microwave radar moisture sensor comprises a probe, a signal channel, a signal processor (DSP), a TPS interface, a microprocessor (MCU), an I2C interface and a driving interface, wherein the output port of the probe is provided with an antenna, and the antenna can be provided with a holder and a filter scraper; the signal processor (DSP) and the microprocessor (MCU) are managed by respective software respectively; a pre-detected signal is connected with the driving interface through the probe, the signal channel, the signal processor, the TPS interface and the microprocessor (MCU); in addition, the probe, a polarization separator and a signal transceiver form a loop; and the antenna is arranged on one side or two sides of a detection medium. Because the microwave radar moisture sensor belongs to a multi-sensor system, correlated variables of the sensor are provided with enough interfaces, and other probes for temperature and electric conductivity can be connected with the signal processor through the I2C so as to finish moisture parameter correction.
Owner:杨厚荣
Quantitative evaluation method for cigarette density distribution uniformity
ActiveCN107084995AQuantitative evaluation of uniformitySimple methodMoisture content investigation using microwavesDensity distributionComputer science
The invention discloses a quantitative evaluation method for cigarette density distribution uniformity. The method comprises the following steps: drawing a cigarette density distribution curve according to the characteristic that the cigarette density distribution is generally in a two-end dense distribution manner; extracting cigarette density data; and performing comprehensive evaluation on the cigarette density distribution uniformity according to the established evaluation index. The method disclosed by the invention has the characteristics of simplicity and feasibility, can realize quantitative evaluation of the cigarette density distribution uniformity and has significances on cigarette designing and coiling process.
Owner:ZHENGZHOU TOBACCO RES INST OF CNTC +1
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