EP2877842A1 - Capacitive device for measuring the moisture content of soil and having a porous access element - Google Patents
Capacitive device for measuring the moisture content of soil and having a porous access elementInfo
- Publication number
- EP2877842A1 EP2877842A1 EP13736869.2A EP13736869A EP2877842A1 EP 2877842 A1 EP2877842 A1 EP 2877842A1 EP 13736869 A EP13736869 A EP 13736869A EP 2877842 A1 EP2877842 A1 EP 2877842A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- measuring device
- access element
- soil moisture
- soil
- moisture measuring
- 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- Withdrawn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
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
Definitions
- the invention relates to a soil moisture measuring device with at least one bottom probe.
- Soil moisture meters are used to determine the moisture content in the soil. For example, irrigation of the corresponding soil is controlled as a function of the determined moisture content.
- the soil whose moisture content is measured is, for example, a garden soil, an agricultural soil or a soil in a flower pot.
- a device for measuring the soil moisture in which the moisture content of the measuring base can be determined from a capacitance measurement, wherein a dielectric of known porosity and pore size is arranged in the electric field between electrodes of a measuring capacitor and brought into contact with the measuring bottom ,
- WO 2010/097689 A1 discloses a system for determining the state and / or changes in the state and / or condition of a potted plant and for displaying the determined state and / or the change to an owner or user by means of wireless communication.
- Sensors for measuring the temperature and / or humidity of the earth are provided in or on a planter.
- US 2011/0043230 A1 discloses a device for measuring the moisture content in a material.
- From US 2010/0251807 AI another device for determining the moisture content is known.
- From DE 102 02 198 AI is a device for measuring the matrix potential in the material with a water content measuring device and a reference kör per, which is brought into contact with the measurement object and allows the ingress of water, the relationship between water content and matrix potential is already known in the reference body, known.
- the reference body consists at least in sections of fibers.
- EP 0 259 012 B1 discloses an electronic moisture meter comprising an oscillation device which has a square wave pulse signal generator, a humidity sensor which is connected to the rectangular wave pulse signal generator and which presents variable characteristics with the change in humidity of the atmosphere and a passive element connected to the rectangular pulse signal generator and constituting a time constant circuit having characteristics of the humidity sensor, the passive element being of a type different from the humidity sensor, and the oscillator producing square wave pulse signals corresponding to changes in the characteristics of the humidity sensor.
- an electric sensor unit for groundwater which comprises electrodes which are embedded in a granular porous medium. The medium is enclosed in a porous ceramic cup.
- a device comprising at least one sensor consisting of a temperature sensor and a means for heating the same, as well as a circuit consisting of an evaluation and a control unit, the heating of the heatable temperature sensor and the determination of the moisture content of a
- Sensor surrounding medium serves, known. Between the sensor and surrounding medium, an intermediate layer is arranged, wherein the sensor is surrounded by this intermediate layer of an absorbent, mechanically deformable and thermally insulating material made of synthetic fibers and / or felt.
- the object of the invention is to provide a soil moisture measuring device of the type mentioned at the outset, by means of which the moisture content can be determined in a simple and reliable manner.
- the bottom probe comprises a carrier, a capacitive measuring device with at least one capacitor with a first capacitor element and a second capacitor element, between which an electric field can be generated the capacitive measuring device is arranged on the carrier, and at least one access element, which covers the capacitive measuring device towards a measuring outer space, which is open-porous and which is impregnated with a hydrophilic material, comprises.
- the open-porous access element provides for the coupling of the capacitive measuring device to the monitored Ground. It will get a good ground contact. Corresponding measurement signals can be achieved independently of the soil type.
- the proportion of water in the access element is a measure of the soil moisture of the soil which is present at the access element.
- the water content in turn influences the capacity.
- the capacity of the at least one capacitor is a measure of the soil moisture. By determining the capacity, the soil moisture can be detected.
- a defined access path for water is provided to the capacitive measuring device via the at least one open porous access element. No calibration is necessary since the capacitive measurement is directly dependent on the soil moisture of the soil, which is present at the open porous access element.
- Access path for water provided to measure the moisture content of the soil can. Soil water is conducted to the field loading area by capillary effects. The impregnation forms an inner coating in the pores of the access element.
- the access element represents a porous medium between the measuring floor and the capacitive measuring device.
- the hydrophilic impregnation does not limit the water transport through the open porous access element. It is advantageous if the first capacitor element and the second capacitor element (the electrodes of the capacitor) are formed as conductor tracks, which are arranged on the carrier, wherein the conductor tracks are particularly flat. This makes it possible, in particular, to achieve direct, gap-free contact between the at least one access element and the at least one capacitor.
- the carrier is formed on at least one side on which the capacitive measuring device is arranged.
- the at least one access element is arranged in a stray field region of the at least one capacitor.
- the at least approximately homogeneous field region of the at least one capacitor is directly between the first capacitor element and the second
- Capacitor element The at least one access element covers the capacitor above this. It is thus permeated by the stray field. Due to the moisture content in the access element, this stray field is correspondingly influenced, ie the dielectric constant changes.
- the at least one access element contacts electrical insulation for the first capacitor element and the second capacitor element directly and in particular without a gap, and in particular if the electrical insulation touches the first capacitor element and the second capacitor element directly and without gaps.
- the access element thereby forms a porous medium medium between the soil and the capacitive measuring device (the sensor surface). Due to the direct contact, the medium affects the measurement only minimally or even Not.
- the electrical insulation is applied for example as a coating on the at least one capacitor. In principle, it can also be arranged on the access element, for example as a coating.
- the carrier and the at least one access element are separate components. The carrier and the at least one access element can thereby be produced separately. As a result, in particular the access element with its open porosity and impregnation can be produced in a simple manner.
- a clamping device is provided, through which the at least one access element is clamped to the carrier and pressed against it. This allows a direct and in particular gap-free contact between the capacitive measuring device and the
- the at least one bottom probe has a housing on which the carrier is arranged, wherein the housing comprises at least a first housing part and a second housing part, wherein the second housing part is connected to the first housing part and the at least one via the second housing part Access element is pressed against the carrier.
- a clamping device is realized, which braces the at least one access element to the housing and thereby presses against the capacitive measuring device.
- the second housing part expediently has at least one window recess for the at least one access element, wherein the at least one access element has a particularly circumferential contact surface for engagement with the second housing part in the region of the at least one window recess.
- the at least one access element is at least partially submerged through the window recess to allow contact with soil. Through the contact surface can be on the second Housing part press the at least one access element against the carrier with the capacitive measuring device.
- the at least one access element is fixed interchangeably on the at least one bottom probe. This makes it easy to use different access elements for different types of soil and the like.
- the at least one access element is applied to the carrier.
- the at least one access element and the carrier are directly connected to each other.
- the at least one access element forms the support for the capacitive measuring device, that is to say the capacitive measuring device is arranged directly on the at least one access element.
- the at least one access element has a thickness as the distance between the capacitive measuring device and a measuring object (the soil) in the range between 0.5 mm and 10 mm and in particular in the range between 1 mm and 5 mm.
- a soil moisture content can be reliably determined by determining the capacity of the at least one capacitor.
- a porosity (volume fraction of the pores) of the at least one access element is greater than or equal to 15% and in particular greater than or equal to 30%.
- the ability of the water transport in the at least one access element as medium medium is adapted to the surrounding soil and the at least one access element limits the water transport. This, in turn, can be determined in a safe way, the soil moisture.
- sandy soil has an effective porosity of 10% to 15%. If the porosity is then greater than or equal to 15%, then acts at least one access element not limiting for water transport compared to the surrounding soil.
- the porosity is limited upwards by the mechanical stability of the access element. For example, it is less than 60%. It is particularly advantageous if the at least one access element has a set pore distribution which has at least one maximum at a pore size which is adapted in particular to a type of soil whose moisture content is to be measured.
- the adaptation can be exact or the adaptation can be such that, for example, several types of soil can be detected. It is thereby ensured that the at least one access element does not limit the water transport.
- the water absorption and release of water is essentially the same as in the surrounding soil.
- the pore distribution is monomodal or multimodal.
- a monomodal pore distribution pores of average pore size have the highest frequency. There are no other major maxima in pore distribution. (For reasons of production technology, there may be one or more secondary maxima at pore sizes which are not relevant for the measurement.)
- the corresponding monomodal pore distribution can be designed to be sharp or broad by the maximum with the average pore size. With a "sharp" pore distribution the frequency decreases strongly from the maximum. With a broad pore distribution, pore sizes which are more distant from the mean pore size still have a relevant frequency.
- the pore distribution has several maxima. The maxima are preferably at pore sizes that are adapted to appropriate soil types.
- a multimodal pore distribution can be considered as a superposition of monomodal pore distributions.
- a monomodal pore distribution especially when this is relatively sharp, often allows a higher accuracy of measurement, especially for a particular type of soil. This advantage also results in a multimodal pore distribution for several soil types, if the maxima are adapted accordingly. At a wide monomodal pore distribution can determine the moisture content of different types of soil.
- the soil moisture measuring device according to the invention can be used in a universal manner if a plurality of access elements or multiple access element regions of different average pore size are arranged on the at least one bottom probe and / or a plurality of bottom probes differ with respect to the average pore size
- Access elements are provided and / or are provided with respect to the average pore-sized different access elements for replacement at the at least one bottom probe.
- the soil moisture can be determined on the one hand even with different soil types in an accurate way and on the other hand results in a wide range of applications.
- the at least one access element has an adapted to sandy soil average pore size and / or in a pore distribution has a maximum at a pore size, which is adapted to a sandy soil. This average pore size or pore size with maximum is in particular of the order of 22 pm.
- Sandy soils have a mean pore size (determined by weighted averaging) of about 22.3 ⁇ m.
- the weighted averaging of the pore sizes in sandy soils is calculated by weighting the values of pore diameters for fine pores, center pores and coarse pores and forming the arithmetic mean.
- sandy soils have the largest pores and dry out quickly. If the at least one access element is set to a sandy bottom which dries relatively quickly, and which has the largest pores in comparison with other conventional soil types, it is ensured that the average pore size or maximum pore size in the at least one access element is greater than or equal to is as / as in the surrounding soil. As a result, at least not too high soil moisture is displayed. For example, if the soil moisture meter is integrated with an irrigation system, it can prevent irrigation from occurring too late.
- the mean pore size or a pore size with maximum in the at least one access element lies in the range between 10 ⁇ m and 25 ⁇ m and in particular in the range between 15 ⁇ m and 25 ⁇ m and in particular in the range between 18 ⁇ m and 25 ⁇ m.
- the weighted averaging of the pore sizes of sandy soils results in a pore size of 22.3 ⁇ m. It is achieved by a good adaptation.
- a pore distribution of the at least one access element is such that, if a pore size deviates from the average pore size by more than 25%, a corresponding frequency is smaller by at least 75% compared to the frequency with the average pore size. This results in a relatively sharp distribution of the pore size around the average pore size.
- the pore distribution is such that at a pore size of 10 pm and / or 25 pm, a frequency is at least 25% of a frequency maximum. This results in a relative pore distribution, in which even pore sizes of 10 pm or 25 pm have a relevant frequency.
- At least one frequency maximum is in particular a pore size which is between 10 pm and 25 pm and, for example, about 20 pm or 22 pm. It can be characterized by a monomodal or multimodal pore distribution of Determine moisture content in a variety of soil types. Such a pore distribution can cover all typical pore sizes in conventional soils.
- the at least one access element is a sintered part. Such a sintered part can be produced with its open porosity in a relatively simple manner.
- the access element is sintered from polyethylene.
- the at least one access element is made of a plastic material or ceramic material.
- plastic materials are, for example, polyethylene or polyurethane.
- Possible open-porous ceramic materials are, for example, cordierite-based or aluminum oxide-based.
- the at least one bottom probe is designed as a spit. This makes it easy to bring in the soil. It is advantageous if an evaluation device is provided which is in signal-effective connection with the capacitive measuring device, by which in particular a pulsed electric field can be generated at the at least one capacitor. As a result, the capacity can be measured in a simple manner and this in turn makes it possible to easily determine the soil moisture.
- Figure 1 is an exploded perspective view of an embodiment of a soil moisture measuring device according to the invention
- Figure 2 is a schematic enlarged view of the area A of Figure 1
- Figure 3 is a schematic representation of a soil moisture measuring device in which a soil probe is arranged in a measuring space and schematically the conditions at the soil probe
- Figure 4 shows a pore distribution in one embodiment of a
- Figure 5 shows a further pore distribution in a further Aus
- FIG. 1 An exemplary embodiment of a soil moisture measuring device according to the invention, which is shown in an exploded view in FIG. 1 and denoted there by 10, comprises a soil probe 12.
- This soil probe 12 is designed as a ground spike; it can be plugged into the ground, for example, in a flower pot or in a garden.
- the bottom probe 12 includes a housing 14 having a first housing part 16 and a second housing part 18.
- the second housing part 18 is connected to the first housing part 16, for example via
- the housing 14 extends in a direction 22.
- the housing 14 is formed in an area along the direction 22 at least approximately cuboid. At one end 24 has the
- This cross-sectional constriction 26 is formed, for example, by the fact that the Housing 14 is formed at the end 24 pyramidal, tetrahedral or conical.
- a carrier 28 is arranged in the housing 14.
- the carrier 28 is designed in particular as a circuit board.
- a capacitive measuring device 30 which (at least) has a capacitor 32 (see Figure 2) with a first capacitor element 34a (first electrode) and a second capacitor element 34b (second electrode).
- the carrier 28 is plate-shaped. It has a first planar side 36a and a second planar side 36b. The first side 36a and the second side 36b are parallel to each other.
- the capacitor or capacitors 32 are arranged on the first side 36a.
- the first capacitor element 34a and the second capacitor element 34b are formed by respective planar capacitor plates in particular in the form of conductor tracks on the carrier 28.
- the corresponding metallic material of the first capacitor element 34a and the second capacitor element 34b is in particular applied directly to the carrier 28.
- the capacitor 32 is a plate capacitor.
- leads to the capacitor 32 in the form of traces are arranged on the carrier 28 (not shown in the drawings).
- a trace forming a lead and a trace forming a capacitor element 34a, 34b i.e., an electrode
- an electrode has larger transverse dimensions than a lead.
- the carrier 28 includes an area 38 that lies outside of the ground probe 12. In this area 38, an evaluation device 40 is arranged on the carrier 28.
- the first capacitor element 34a and the second capacitor element 34b are spaced apart from each other with a non-conductive (dielectric) intermediate region.
- the capacitor 32 is controlled via the evaluation device 40. He is driven in particular pulsed.
- a pulse frequency is for example in the kHz range.
- An electric field 42 (FIG. 2) is formed on the capacitor 32 between the first capacitor element 34a and the second capacitor element 34b.
- the electric field 42 has a homogeneous region 44 and a stray field region 46.
- the field lines of the electric field 42 extend unbraked between the first capacitor element 34a and the second capacitor element 34b.
- the stray field region 46 the field lines are curved outside the gap between the first capacitor element 34a and the second capacitor element 34b.
- the capacitor 32 and preferably also the leads is associated with an electrical insulation.
- the electrical insulation is indicated in Figure 2 by the reference numeral 47.
- an insulating layer 47 is arranged on the carrier 28, which covers the Kodensatoren 32 and the leads.
- the first housing part 16 has a contact region 48, which is adapted in its shape to the carrier 28. At this investment area 48 of the carrier 28 is located.
- the carrier 28 is provided with through holes 50, through which respective screws 20 are immersed.
- the second housing part 18 encloses the housing 14. It is held by the fixing of the second housing part 18 with the first housing part 16 and the carrier 28 in the housing 14. In the area of the capacitive measuring device 30, the second housing part 18 has a continuous window recess 52.
- An access element 54 is seated in the window recess 52.
- the access element 54 covers the capacitive measuring device 30 to a measuring outer space 56 on the window recess 52.
- the access element 54 represents the actual measuring interface of the capacitive measuring device 30 to the outer space (when the ground probe 12 is in a ground, towards the ground) is.
- the access element 54 facing the capacitive measuring device 30, has a first planar side 58a. Further, in one embodiment, it has opposite a second planar side 58b.
- the access element 54 directly adjoins the capacitor (s) 32 without a gap.
- Window recess 52 penetrated, so that the access element 54, for example, is flush with an outer side of the second housing part 18 or protrudes beyond this.
- the second planar side 58b of the access element 54 can also be set back relative to the outside of the second housing part 18.
- the access element 54 is formed as a plate, which encompasses a first region 60 and a second region 62.
- the first region 60 and the second region 62 are integrally connected to each other.
- the first region 60 has larger transverse dimensions than the second region 62.
- a circumferential abutment region 64 is formed on the first region 60.
- the region 62 is arranged in the window recess 52.
- the contact region 64 bears against an inner side 66 of the second housing part 18.
- the second housing part 18 When the second housing part 18 is connected to the first housing part 16, then the second housing part 18 presses on its inside on the investment area 64 and thus presses the access element 54 against the capacitive measuring device. It is characterized formed a clamping device 68, which braces the access element 54 in the housing 14 with the support 28 and the capacitive measuring device 30.
- the access element 54 is made of an open porous material.
- it is made of a plastic material.
- the plastic material is in particular a sintered material.
- An example of the material used is polyethylene.
- the access element 54 is made of a foam material such as a polyurethane foam material or of a porous ceramic.
- the access material is made of cordierite. It is also possible that, for example, alumina-based ceramics may be used.
- the access element 54 is impregnated with a hydrophilic material.
- Water in the measuring outer space 56 can pass through the pores of the access element 54, the capacitive measuring device 30.
- the capacitance of the capacitor 32 of the capacitive measuring device 30 changes depending on the dielectric constant of the medium between the first capacitor element 34a and the second capacitor element 34b.
- the dielectric constant of this material depends on the water content.
- the water content in the access element 54 in turn depends on the water content of the surrounding soil medium, that is on the water content in the measuring outer space.
- a thickness D (see FIG. 3) of the access element 54 is in the range between 0.5 mm and 10 mm and in particular in the range between 1 mm and 5 mm. The thickness D is also the distance between the measuring outer space 56 and the capacitive measuring device 30.
- the housing 14 of the bottom probe 12 is arranged on a housing 70.
- the housing 70 is above the soil.
- the evaluation device 40 is arranged in the housing 70.
- the housing is closed fluid-tight.
- a battery holder 72 is arranged for a battery 74.
- the battery 74 provides the necessary electrical energy for the evaluation device 40. Furthermore, the necessary electrical energy is provided to generate the electric field 42 at the capacitive measuring device 30.
- the soil moisture measuring device 10 functions as follows:
- the bottom probe 12 is immersed in the measurement environment.
- the access element 54 is in contact with the second side 58b at the ground.
- the access element 54 is the intermediate element which provides the ground contact.
- a pulsed electric field 42 is generated at the capacitor or capacitors 32.
- the dielectric constant is influenced by the medium which lies in the stray field region 46.
- the access element 54 Medium in the stray field region 46 is the access element 54 with a corresponding water content. As indicated in FIG. 3, the access element 54 forms a porous cover of the capacitive measuring device 30. The access element 54 contacts the respective capacitor 32 without a gap. The access element 54 in the window recess 52 makes contact with the ground between the sensory part of the floor probe 12 and the floor improved. By capillary action, soil water is passed through the access element 54 into the measuring area, namely the stray field area 46. In principle, a transverse distribution of water in the porous access element 54 is possible even with poor ground contact.
- the dielectric constant depends on the water content in the medium (access element 54 with water). This water content in turn is a measure of the soil moisture. By appropriate evaluation on the capacitive measuring device 30 via the evaluation device 40, the soil moisture can be determined thereby.
- the access element 54 is in particular made of a plastic material. Such a plastic material is usually hydrophobic. Through a hydrophilic impregnation of the access element 54, in which the open porosity is maintained, a water transport through the pores of the
- Access element 54 allows the stray field area 46 and the water transport through the pores is the water transport in a natural
- the hydrophilic impregnation takes place in particular under defined process conditions. For example, in the production of a vacuum impregnation with curing, excessive temperatures are carried out.
- a solvent-based dispersion of nanoscale particles is used as the impregnation material.
- the active ingredient base are hydrophilic surface-modified Si0 2 nanoparticles.
- the solvent evaporates in a drying process during the production of the impregnation and the hydrophilic inner coating of nanoparticles remains.
- the impregnating material (with solvent) was previously introduced under reduced pressure into the pores of the starting material of the access element.
- the access element 54 is adapted in its pore structure and pore distribution to the soil structure.
- a sandy soil has a grain size in the range of 0.063 mm to 2 mm.
- a typical pore size (weighted average) for sandy soil is 22.3 pm.
- An effective porosity for a typical sandy soil ranges between 10% and 15%.
- a typical grain size ranges from 0.002 mm to 0.063 mm.
- a typical pore size in the soil is about 11.8 pm.
- An effective porosity for such a soil is between 3% and 6%.
- the grain size of a typical clay soil is below 0.002 mm.
- a typical pore size is 0.062 pm and the effective porosity is between 0% and 3%.
- Such clay soil is hardly permeable to water.
- the porosity in the access element 54 (that is to say the proportion of pores in the total volume) is greater than 15%. It is advantageous if the pore size is between 10 pm and 25 pm.
- a sandy soil is usually the most permeable soil, that is also the soil that loses water the fastest. When the soil moisture meter is used for irrigation control, it is advantageous to use the corresponding parameters for sandy soils. It is useful if a mean pore size in the access element 54 in the said range between 10 ⁇ and 25 ⁇ and, for example, at about 20 ⁇ .
- the porosity of the access element 54 is greater than or equal to 15%. In one embodiment, it is greater than or equal to 35%. It is preferably less than 60%, so that a mechanically stable access element 54 is realized.
- a mean pore size s in the access element 54 is 19.24 pm. (A minimum pore size is 12.28 pm and a maximum pore size is included
- Pores of average pore size s have the highest frequency N in the pore distribution.
- the pore distribution is monomodal.
- the mean pore size has a maximum of frequency. Secondary maxima, which are at smaller pore sizes, are production-related and have no influence on the functioning.
- the frequency of pore sizes around the mean pore size s is such that pores whose pore size deviates from the average pore size by more than 25% have a frequency in comparison to the frequency at the average pore size s, which is smaller by at least 75% , This results in a relatively sharp frequency distribution around the average pore size.
- the access element 54 is adapted to a type of soil. This is done, for example, in that the mean pore diameter is set correspondingly with a sharp distribution around the mean pore diameter (compare FIG.
- the soil moisture measuring device 10 comprises a plurality of bottom probes 12, wherein different (with respect to the average pore diameter s) access elements 54 are arranged on different bottom probes.
- the pore distribution is relatively broad starting from a maximum at s, so that in particular also pore sizes of 10 pm and 25 pm have a relevant frequency, which in particular at least 25% of the frequency at the maximum (at the pore size s) is.
- Pore distribution is an adaptation to different soil types with a single access element possible.
- the pore distribution 76 is monomodal.
- a multimodal pore distribution 78 is provided with a plurality of maxima 80a, 80b, 80c.
- the maxima for corresponding pore sizes are adapted to different soil types. With such a set pore distribution, the moisture content of different soil types can be carried out with high accuracy.
- an open-porous access element 54 which impregnates with a hydrophilic material.
- a measurement can be carried out which is largely independent of the grain size and ground contact of the soil probe 12. It is measured in the stray field.
- the access element 54 also provides an electrical insulating layer.
- a targeted capillary water exchange can be achieved according to the natural soil matrix, if the average pore size s is selected suitable. If the pore size is adapted to the pore size of a sand grain, then no limitation of the water exchange is effected for all other types of soil. As a result, the resulting readings are a reliable measure of soil moisture; the determined capacitance on the capacitive measuring device 30 is a direct and accurate measure of the soil moisture.
- the access element 54 and the carrier 28 are separate elements which are clamped together.
- the access element 54 is applied directly to the capacitive measuring device 30 on the carrier 28.
- the capacitive measuring device 30 is produced directly on the access element 54.
- the access element 54 is then the carrier for the capacitive measuring device 30.
- the soil moisture measuring device 10 can pass on its measurement results to a higher-level control unit or this higher-level control unit can be integrated into the evaluation device 40.
- the higher-level control unit controls, for example, an irrigation system as a function of the measured values of the soil moisture measuring device 10; if it turns out that the soil is too dry, an irrigation process is initiated.
- a regulation process can be set up in which irrigation takes place until the soil moisture measuring device 10 provides a measurement signal according to which a desired moisture content is reached.
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012106841.0A DE102012106841A1 (en) | 2012-07-27 | 2012-07-27 | Soil moisture measuring device |
PCT/EP2013/064363 WO2014016106A1 (en) | 2012-07-27 | 2013-07-08 | Capacitive device for measuring the moisture content of soil and having a porous access element |
Publications (1)
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EP2877842A1 true EP2877842A1 (en) | 2015-06-03 |
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EP13736869.2A Withdrawn EP2877842A1 (en) | 2012-07-27 | 2013-07-08 | Capacitive device for measuring the moisture content of soil and having a porous access element |
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EP (1) | EP2877842A1 (en) |
CN (1) | CN104508472A (en) |
DE (1) | DE102012106841A1 (en) |
WO (1) | WO2014016106A1 (en) |
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CN105044287B (en) * | 2015-07-28 | 2017-03-08 | 首都师范大学 | Earth's surface and soil storage integrated measuring instrument |
CN105759126B (en) * | 2016-05-04 | 2018-09-28 | 常州工学院 | A kind of reinforcement type is used for the capacitive means of wheat leaf blade Physiological Electrical Characteristics measurement |
DE102017003134A1 (en) * | 2017-03-31 | 2018-10-04 | Scheppach Fabrikation Von Holzbearbeitungsmaschinen Gmbh | Gardening equipment for tillage and sowing or planting methods with the aid of such a garden implement |
CN107064243B (en) * | 2017-04-18 | 2020-01-14 | 武汉大学 | Argil medium capacitance type soil matrix potential measuring method |
CN113473842B (en) * | 2019-02-25 | 2022-08-12 | 胡斯华纳有限公司 | Battery placement with sensor |
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2012
- 2012-07-27 DE DE102012106841.0A patent/DE102012106841A1/en not_active Withdrawn
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2013
- 2013-07-08 CN CN201380039983.3A patent/CN104508472A/en active Pending
- 2013-07-08 EP EP13736869.2A patent/EP2877842A1/en not_active Withdrawn
- 2013-07-08 WO PCT/EP2013/064363 patent/WO2014016106A1/en active Application Filing
Non-Patent Citations (1)
Title |
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See references of WO2014016106A1 * |
Also Published As
Publication number | Publication date |
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DE102012106841A1 (en) | 2014-01-30 |
CN104508472A (en) | 2015-04-08 |
WO2014016106A1 (en) | 2014-01-30 |
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