ES2111444B1 - DEVICE FOR THE SIMULTANEOUS DETERMINATION OF WATER CONTENT OR DEGREE OF MOISTURE AND ELECTRICAL CONDUCTIVITY IN LAND OR LOW DIELECTRIC MATERIALS. - Google Patents
DEVICE FOR THE SIMULTANEOUS DETERMINATION OF WATER CONTENT OR DEGREE OF MOISTURE AND ELECTRICAL CONDUCTIVITY IN LAND OR LOW DIELECTRIC MATERIALS.Info
- Publication number
- ES2111444B1 ES2111444B1 ES09401681A ES9401681A ES2111444B1 ES 2111444 B1 ES2111444 B1 ES 2111444B1 ES 09401681 A ES09401681 A ES 09401681A ES 9401681 A ES9401681 A ES 9401681A ES 2111444 B1 ES2111444 B1 ES 2111444B1
- Authority
- ES
- Spain
- Prior art keywords
- probe
- land
- electrical conductivity
- impedance
- bridge
- 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.)
- Expired - Fee Related
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
DISPOSITIVO PARA LA DETERMINACION SIMULTANEA DEL CONTENIDO DE AGUA O GRADO DE HUMEDAD Y CONDUCTIVIDAD ELECTRICA EN TERRENOS O MATERIALES DE BAJA CONSTANTE DIELECTRICA. UN DISPOSITIVO PARA LA DETERMINACION SIMULTANEA DEL GRADO DE HUMEDAD Y CONDUCTIVIDAD ELECTRICA EN TERRENOS, BASADO EN LA DEPENDENCIA EXISTENTE ENTRE ESTAS MAGNITUDES CON LAS PARTES REAL E IMAGINARIA DE LA CONSTANTE DIELECTRICA COMPLEJA DEL TERRENO LA CUAL SE DETERMINA UTILIZANDO UNA ONDA ELECTROMAGNETICA ESTABLE DE FRECUENCIA UNICA APLICADA A UNA SONDA, CUYO DIELECTRICO ES EL PROPIO MATERIAL A MEDIR, DE FORMA QUE LA IMPEDANCIA ELECTRICA COMPLEJA QUE PRESENTA LA SONDA SE MIDE MEDIANTE UN PUENTE DE IMPEDANCIAS, DOBLEMENTE AUTOBALANCEADO EN CUADRATURA, A LA FRECUENCIA EMPLEADA (ENTRE 30 Y 200 MHZ), MEDIDA QUE DA LA HUMEDAD (PROPORCIONAL A LA PARTE IMAGINARIA) Y LA CONDUCTIVIDAD ELECTRICA (PROPORCIONAL A LA PARTE REAL) DEL MEDIO DONDE SE HA INTRODUCIDO LA SONDA. LA SONDA ESTA FORMADA POR ELECTRODOS CON DOS O MAS CONDUCTORES DE LONGITUD ADECUADA (GENERALMENTE 12 MM) A LA FRECUENCIA EMPLEADA, INMERSOS EN EL MATERIAL, CONECTADOS POR UN EXTREMO AL PUENTE DE IMPEDANCIAS Y ABIERTOS EN EL EXTREMO OPUESTO. EL AUTO EQUILIBRADO DEL PUENTE DE IMPEDANCIAS, SE REALIZA MEDIANTE DOS DETECTORES SINCRONOS O MULTIPLICADORES QUE UTILIZAN COMO SEÑALES DE REFERENCIA LA MISMA SEÑAL DE EXCITACION DEL PUENTE PERO CON FASES EN CUADRATURA PARA PODER SEPARAR EN CADA DETECTOR LA MEDIDA DE LAS PARTES REAL E IMAGINARIA DE LA IMPEDANCIA COMPLEJA PRESENTADA POR LA SONDA. LA MEDIDA DE IMPEDANCIA DE LA SONDA SE REALIZA DE MANERA DIFERENCIAL ENTRE LOS ESTADOS DE SONDA CONECTADA Y DESCONECTADA.DEVICE FOR THE SIMULTANEOUS DETERMINATION OF WATER CONTENT OR DEGREE OF MOISTURE AND ELECTRICAL CONDUCTIVITY IN LAND OR LOW DIELECTRIC MATERIALS. A DEVICE FOR THE SIMULTANEOUS DETERMINATION OF THE DEGREE OF MOISTURE AND ELECTRICAL CONDUCTIVITY IN LANDS, BASED ON THE EXISTING DEPENDENCE BETWEEN THESE MAGNITUDES WITH THE REAL AND IMAGINARY PARTS OF THE COMPLEX DIFFERENT ELECTROLY OF THE LAND WHICH IS DETERMINED USING A LAND USING TO A PROBE, WHOSE DIELECTRIC IS THE OWN MATERIAL TO MEASURE, SO THAT THE COMPLEX ELECTRICAL IMPEDANCE THAT THE PROBE PRESENTS IS MEASURED THROUGH A BRIDGE OF IMPEDANCES, DOUBLE SELF-BALANCED IN QUADRATURE, AT THE FREQUENCY USED (BETWEEN 30 AND 200 MHZ) WHICH GIVES HUMIDITY (PROPORTIONAL TO THE IMAGINARY PART) AND ELECTRICAL CONDUCTIVITY (PROPORTIONAL TO THE REAL PART) OF THE MIDDLE WHERE THE PROBE HAS BEEN INTRODUCED. THE PROBE IS FORMED BY ELECTRODES WITH TWO OR MORE CONDUCTORS OF SUITABLE LENGTH (GENERALLY 12 MM) AT THE FREQUENCY EMPLOYED, IMMERSED IN THE MATERIAL, CONNECTED BY ONE END TO THE IMPEDANCE BRIDGE AND OPEN ON THE OPPOSITE END. THE BALANCED SELF-BALANCE OF THE IMPEDANCE BRIDGE IS CARRIED OUT THROUGH TWO SYNCHRONOUS DETECTORS OR MULTIPLIERS THAT USE THE SAME SIGNAL OF EXCITATION OF THE BRIDGE AS REFERENCE SIGNALS, BUT WITH SQUARE PHASES IN EACH DETECTOR OF THE MEASURE OF THE MEASURE COMPLEX IMPEDANCE PRESENTED BY THE PROBE. PROBE IMPEDANCE MEASUREMENT IS DIFFERENTIALLY BETWEEN CONNECTED AND DISCONNECTED PROBE STATES.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES09401681A ES2111444B1 (en) | 1994-07-29 | 1994-07-29 | DEVICE FOR THE SIMULTANEOUS DETERMINATION OF WATER CONTENT OR DEGREE OF MOISTURE AND ELECTRICAL CONDUCTIVITY IN LAND OR LOW DIELECTRIC MATERIALS. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES09401681A ES2111444B1 (en) | 1994-07-29 | 1994-07-29 | DEVICE FOR THE SIMULTANEOUS DETERMINATION OF WATER CONTENT OR DEGREE OF MOISTURE AND ELECTRICAL CONDUCTIVITY IN LAND OR LOW DIELECTRIC MATERIALS. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ES2111444A1 ES2111444A1 (en) | 1998-03-01 |
| ES2111444B1 true ES2111444B1 (en) | 1999-07-16 |
Family
ID=8287100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES09401681A Expired - Fee Related ES2111444B1 (en) | 1994-07-29 | 1994-07-29 | DEVICE FOR THE SIMULTANEOUS DETERMINATION OF WATER CONTENT OR DEGREE OF MOISTURE AND ELECTRICAL CONDUCTIVITY IN LAND OR LOW DIELECTRIC MATERIALS. |
Country Status (1)
| Country | Link |
|---|---|
| ES (1) | ES2111444B1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435645B (en) * | 2011-12-28 | 2013-10-23 | 江苏大学 | Measuring method for moisture content and conductivity of soilless culture substrate and sensor thereof |
| CN114910524B (en) * | 2022-05-18 | 2023-05-09 | 中国科学院西北生态环境资源研究院 | Soil complex dielectric constant mixed model based on double electric layer electrostatic field characteristic function |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4174498A (en) * | 1978-03-30 | 1979-11-13 | Preikschat F K | Apparatus and method for providing separate conductivity, dielectric coefficient, and moisture measurements of particulate material |
| US4181881A (en) * | 1978-05-15 | 1980-01-01 | Preikschat F K | Electrical impedance measuring apparatus for providing separate measurements of the conductivity and dielectric coefficient of various materials |
| US4818977A (en) * | 1987-11-03 | 1989-04-04 | Mine Safety Appliances Company | Combustible gas detector having temperature stabilization capability |
| US5418466A (en) * | 1990-10-12 | 1995-05-23 | Watson; Keith | Moisture and salinity sensor and method of use |
-
1994
- 1994-07-29 ES ES09401681A patent/ES2111444B1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ES2111444A1 (en) | 1998-03-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EC2A | Search report published |
Date of ref document: 19980301 Kind code of ref document: A1 Effective date: 19980301 |
|
| FD1A | Patent lapsed |
Effective date: 20040730 |