DE19540507A1 - Determining moisture level of sand - Google Patents
Determining moisture level of sandInfo
- Publication number
- DE19540507A1 DE19540507A1 DE1995140507 DE19540507A DE19540507A1 DE 19540507 A1 DE19540507 A1 DE 19540507A1 DE 1995140507 DE1995140507 DE 1995140507 DE 19540507 A DE19540507 A DE 19540507A DE 19540507 A1 DE19540507 A1 DE 19540507A1
- Authority
- DE
- Germany
- Prior art keywords
- sand
- moisture
- neural network
- measured
- real
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/048—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance for determining moisture content of the material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
- G01N33/246—Earth materials for water content
Abstract
Description
Vorgestellt wird ein Verfahren, bei dem der komplexe Widerstand zwischen zwei in Sand eingetauchten Elektroden bei zwei verschiedenen Frequenzen gemessen wird. Aus diesen Messungen wird ein elektrisches Modell des feuchten Sandes mit vier feuchteabhängigen Bauelementen abgeleitet (Abb. 1). Aus den Bauelementen des Modells wird die Feuchtigkeit mit Hilfe eines neuronalen Netzes bestimmt, das mit einem Referenzsand trainiert wurde.A method is presented in which the complex resistance between two electrodes immersed in sand is measured at two different frequencies. An electrical model of the wet sand with four moisture-dependent components is derived from these measurements ( Fig. 1). Moisture is determined from the components of the model with the help of a neural network that has been trained with a reference sand.
Ein bisher eingesetztes Verfahren bestimmt die Feuchtigkeit von Sand durch Messen des ohmschen Widerstandes zwischen den Elektroden. Zuvor wird in einer Eichmessung die Widerstands-Feuchte-Kennlinie für einen Referenzsand ermittelt. Die Widerstandmessung ergibt vor allem bei hohen Feuchten eine geringe Genauigkeit, weil sich die Widerstands- Feuchte-Kennlinie zu hohen Feuchten hin abflacht. Außerdem hängt die ermittelte Sandfeuchte stark von der Sandsorte ab. Deshalb muß für jeden Sand eine gesonderte Eichmessung zur Bestimmung der Kennlinien durchgeführt werden.A previously used method determines the moisture of sand by measuring the ohmic resistance between the electrodes. Before this is carried out in a calibration measurement Resistance-moisture characteristic curve determined for a reference sand. The resistance measurement results in low accuracy, especially at high humidity, because the resistance The moisture characteristic flattens out towards high humidity. The determined sand moisture also depends strongly depends on the type of sand. Therefore, a separate calibration measurement must be carried out for each sand Determination of the characteristic curves can be carried out.
Bekannt geworden sind auch Verfahren, bei denen die Kapazität zwischen den Elektroden gemessen wird. Die Kapazitätsmessung liefert bei großen Sandfeuchten bessere Ergebnisse als die Widerstandsmessung, die Abhängigkeit von der Sandsorte ist aber noch größer als bei der Widerstandsmessung.Methods are also known in which the capacitance between the electrodes is measured. The capacity measurement gives better results than with large sand moisture the resistance measurement, the dependence on the type of sand is even greater than that of the Resistance measurement.
Mit dem vorliegenden Verfahren wird die Genauigkeit der Feuchtebestimmung verbessert und eine weitgehende Unabhängigkeit der Feuchtebestimmung von der Sandsorte erreicht. Das elektrische Modell des Sandes ist bei diesem Verfahren nicht mehr ein Widerstand oder eine Kapazität, sondern ein Netzwerk mit vier feuchteabhängigen Bauelementen, den Widerständen R1 und R2 und den Kapazitäten C1 und C2 (Abb. 1). Zur Bestimmung der vier Bauelemente werden Real- und Imaginärteil des komplexen Widerstandes bei zwei verschiedenen Frequenzen, z. B. bei 1 KHz und bei 1 MHz, gemessen und anschließend aus den vier Meßwerten vier Bauelemente berechnet.With the present method, the accuracy of the moisture determination is improved and the moisture determination is largely independent of the type of sand. With this method, the electrical model of the sand is no longer a resistor or a capacitance, but a network with four moisture-dependent components, the resistors R1 and R2 and the capacitors C1 and C2 ( Fig. 1). To determine the four components, the real and imaginary part of the complex resistance at two different frequencies, e.g. B. at 1 KHz and at 1 MHz, measured and then calculated four components from the four measured values.
Zur Bestimmung der Sandfeuchte werden folgende Merkmale verwendet: R1, C1, R2, die Zeitkonstante R1*C1 und das Verhältnis R1/R2. Die Merkmale wurden so gewählt, daßThe following characteristics are used to determine the sand moisture: R1, C1, R2, the time constant R1 * C1 and the ratio R1 / R2. The characteristics were chosen so that
- - für alle relevanten Feuchten mindestens ein Merkmal eine ausreichende Empfindlichkeit (Änderung des Merkmalswertes vs Feuchte) besitzt- At least one characteristic has sufficient sensitivity for all relevant humidity levels (Change in the characteristic value vs moisture)
- - eine von der Sandsorte weitgehend unabhängige Feuchtebestimmung ermöglicht wird.- A moisture determination largely independent of the sand type is made possible.
Der Zusammenhang zwischen diesen fünf Merkmalen und der Sandfeuchte wird empirisch ermittelt. Hierzu werden an einem Referenzsand bei verschiedenen, bekannten Feuchten im Bereich von 1 bis 12 Gewichtsprozent die vier Bauelemente des elektrischen Modells des Sandes bzw. die oben genannten fünf Merkmale bestimmt. Mit dem Ergebnis dieser Eichmessung wird ein neuronales Netz trainiert. Die fünf Merkmale bilden hierbei die Eingangswerte des neuronalen Netzes. Ausgangswert des Netzes ist die Sandfeuchte.The relationship between these five characteristics and sand moisture is empirical determined. For this purpose, a reference sand at different, known humidities in the Range from 1 to 12 percent by weight of the four components of the electrical model of the Sandes or the above five characteristics determined. With the result of this A neural network is trained in calibration measurement. The five characteristics form the Input values of the neural network. The initial value of the network is the sand moisture.
Beim Einsatz des Verfahrens berechnet das trainierte, neuronale Netz die Sandfeuchte aus fünf Merkmalswerten, die an dem zu messenden Sand durch Messung des komplexen Widerstandes bei zwei Frequenzen bestimmt wurden.When using the method, the trained neural network calculates the sand moisture from five Characteristic values on the sand to be measured by measuring the complex resistance were determined at two frequencies.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1995140507 DE19540507A1 (en) | 1995-10-31 | 1995-10-31 | Determining moisture level of sand |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1995140507 DE19540507A1 (en) | 1995-10-31 | 1995-10-31 | Determining moisture level of sand |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19540507A1 true DE19540507A1 (en) | 1997-05-07 |
Family
ID=7776238
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1995140507 Withdrawn DE19540507A1 (en) | 1995-10-31 | 1995-10-31 | Determining moisture level of sand |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE19540507A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000033071A2 (en) * | 1998-12-03 | 2000-06-08 | Fairfield Control Systems Ltd | Method of, and device and system for, monitoring soil moisture content |
EP1014082A2 (en) * | 1998-12-23 | 2000-06-28 | Eaton Corporation | Fluid condition monitor |
RU2444725C2 (en) * | 2010-03-11 | 2012-03-10 | Государственное образовательное учреждение высшего профессионального образования "Тамбовский государственный технический университет" ГОУ ВПО ТГТУ | Method of estimating moisture content of paste-like material when drying in roll-band drier |
CN110243886A (en) * | 2019-07-09 | 2019-09-17 | 邓博洋 | A kind of low yield gas well mouth of oil well hydrated comples ion method based on nonlinear characteristic |
-
1995
- 1995-10-31 DE DE1995140507 patent/DE19540507A1/en not_active Withdrawn
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000033071A2 (en) * | 1998-12-03 | 2000-06-08 | Fairfield Control Systems Ltd | Method of, and device and system for, monitoring soil moisture content |
WO2000033071A3 (en) * | 1998-12-03 | 2000-08-24 | Fairfield Control Systems Ltd | Method of, and device and system for, monitoring soil moisture content |
EP1014082A2 (en) * | 1998-12-23 | 2000-06-28 | Eaton Corporation | Fluid condition monitor |
EP1014082A3 (en) * | 1998-12-23 | 2001-02-07 | Eaton Corporation | Fluid condition monitor |
US6278281B1 (en) | 1998-12-23 | 2001-08-21 | Eaton Corporation | Fluid condition monitor |
RU2444725C2 (en) * | 2010-03-11 | 2012-03-10 | Государственное образовательное учреждение высшего профессионального образования "Тамбовский государственный технический университет" ГОУ ВПО ТГТУ | Method of estimating moisture content of paste-like material when drying in roll-band drier |
CN110243886A (en) * | 2019-07-09 | 2019-09-17 | 邓博洋 | A kind of low yield gas well mouth of oil well hydrated comples ion method based on nonlinear characteristic |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8139 | Disposal/non-payment of the annual fee |