ES2111444A1 - Device for the simultaneous determination of water content or degree of moisture and electrical conductivity in soils or materials with a low dielectric constant. - Google Patents
Device for the simultaneous determination of water content or degree of moisture and electrical conductivity in soils or materials with a low dielectric constant.Info
- Publication number
- ES2111444A1 ES2111444A1 ES09401681A ES9401681A ES2111444A1 ES 2111444 A1 ES2111444 A1 ES 2111444A1 ES 09401681 A ES09401681 A ES 09401681A ES 9401681 A ES9401681 A ES 9401681A ES 2111444 A1 ES2111444 A1 ES 2111444A1
- Authority
- ES
- Spain
- Prior art keywords
- probe
- impedance
- moisture
- electrical conductivity
- soils
- 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.)
- Granted
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Device for the simultaneous determination of water content or degree of moisture and electrical conductivity in soils or materials with a low dielectric constant. A device for simultaneously determining the degree of moisture and electrical conductivity in soils, based on the dependence existing between these values and the real and imaginary parts of the complex dielectric constant of the soil which is determined using a stable, single- frequency electromagnetic wave applied to a probe, whose dielectric is the material itself to be measured, so that the complex electrical impedance of the probe is measured by means of an impedance bridge, doubly self-balanced in quadrature, at the frequency used (between 30 and 200 MHz), a measurement that gives the moisture (proportional to the imaginary part) and the electrical conductivity (proportional to the real part) of the medium in which the probe has been inserted. The probe is formed of electrodes with two or more conductors of suitable length (generally 12 mm) for the frequency used, immersed in the material, connected at one end to the impedance bridge and open at the opposite end. The self-balancing of the impedance bridge is carried out by means of two synchronous detectors or multipliers that use the same excitation signal from the bridge as reference signals, but with phases in quadrature in order to be able to separate the measurement of the real and imaginary parts of the complex impedance presented by the probe, in each detector. Measuring the probe's impedance is carried out differentially between the 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 true ES2111444A1 (en) | 1998-03-01 |
| ES2111444B1 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435645A (en) * | 2011-12-28 | 2012-05-02 | 江苏大学 | Measuring method for moisture content and conductivity of soilless culture substrate and sensor thereof |
| CN114910524A (en) * | 2022-05-18 | 2022-08-16 | 中国科学院西北生态环境资源研究院 | Soil complex dielectric constant mixing model based on electric double layer electrostatic field characteristic function |
Citations (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 |
| EP0314919A2 (en) * | 1987-11-03 | 1989-05-10 | Mine Safety Appliances Company | Combustible gas detector having temperature stabilization capability |
| WO1992007251A1 (en) * | 1990-10-12 | 1992-04-30 | Keith Watson | Moisture and salinity sensor and method of use |
-
1994
- 1994-07-29 ES ES09401681A patent/ES2111444B1/en not_active Expired - Fee Related
Patent Citations (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 |
| EP0314919A2 (en) * | 1987-11-03 | 1989-05-10 | Mine Safety Appliances Company | Combustible gas detector having temperature stabilization capability |
| WO1992007251A1 (en) * | 1990-10-12 | 1992-04-30 | Keith Watson | Moisture and salinity sensor and method of use |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435645A (en) * | 2011-12-28 | 2012-05-02 | 江苏大学 | Measuring method for moisture content and conductivity of soilless culture substrate and sensor thereof |
| 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 |
| CN114910524A (en) * | 2022-05-18 | 2022-08-16 | 中国科学院西北生态环境资源研究院 | Soil complex dielectric constant mixing model based on electric double layer electrostatic field characteristic function |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2111444B1 (en) | 1999-07-16 |
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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 |