EP1889051A1 - Dispositif s'utilisant avec un capteur pour ameliorer la precision et capteur a precision amelioree - Google Patents

Dispositif s'utilisant avec un capteur pour ameliorer la precision et capteur a precision amelioree

Info

Publication number
EP1889051A1
EP1889051A1 EP06741616A EP06741616A EP1889051A1 EP 1889051 A1 EP1889051 A1 EP 1889051A1 EP 06741616 A EP06741616 A EP 06741616A EP 06741616 A EP06741616 A EP 06741616A EP 1889051 A1 EP1889051 A1 EP 1889051A1
Authority
EP
European Patent Office
Prior art keywords
sensor
interface
moisture
surrounding
solid medium
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Withdrawn
Application number
EP06741616A
Other languages
German (de)
English (en)
Inventor
Walter Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PlantCare AG
Original Assignee
PlantCare AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by PlantCare AG filed Critical PlantCare AG
Publication of EP1889051A1 publication Critical patent/EP1889051A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G25/00—Watering gardens, fields, sports grounds or the like
    • A01G25/16—Control of watering
    • A01G25/167—Control by humidity of the soil itself or of devices simulating soil or of the atmosphere; Soil humidity sensors
    • 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

Definitions

  • the invention is in the field of improving sensor accuracy and reliability, and more particularly relates to a device for use with a sensor to improve its accuracy, and to an apparatus for measuring the moisture content in solid materials with improved accuracy.
  • tensiometers are used to measure soil moisture. These gauges consist of a hermetically sealable tube with a porous ceramic cap at the bottom. At the upper end a conventional or electronic manometer is connected. If the tube is filled with water, this flows through the porous ceramic cap to the outside. If the tube is inserted into a medium which can absorb water, this creates a vacuum in the tube which can be measured.
  • this measurement principle has a number of serious disadvantages:
  • the accuracy of the measurement depends strongly on the type of medium surrounding the ceramic cap. In sandy or with stones or gravel staggered substrates, it is very common that the contact surface between ceramic and surrounding earth is not defined; This means that air gaps form, which strongly influence the measurement.
  • the porous ceramic can calcify by calcareous water and microorganisms can colonize the ceramic. This leads to a drift of the measurement result over time.
  • the suction stress of Kunststofferde on the grain size of, for example, quartz sand is adjusted.
  • the Kunststofferde but also has a high heat capacity and thermal conductivity, so that the moisture measurement, especially those by thermal processes, determined by the properties of Kunststofferde.
  • the Kunststofferde In order for the still little defined interface earth / Kunststofferde, which consists of a, the Kunststofferde enclosing, network, does not come to fruition, the Kunststofferde must also have a certain volume.
  • the object of the invention is thus to increase the measurement accuracy of sensors, in particular by improving the interaction between the sensor and the surrounding medium.
  • the invention is based on the idea by the use of a standardized interface between the sensor and the surrounding medium to compensate for differences in the surface morphology and thereby increase the accuracy of the sensors, in particular of soil moisture sensors, such as. Tensiometers.
  • Such interfaces should have as little influence on humidity as possible due to their material properties and design.
  • Such an interface allows a moisture balance between Sensoroberfiumblee and surrounding medium as possible without affecting the measurement, in particular due to thermal properties.
  • the interface is mechanically deformable so that it can adapt to a not clearly defined surface of a Feststoffstoffrnediums or solid mixture and z. B. impressions of stones or interstices, the inhomogeneous surface of a granular medium, such as bulk material, etc., are compensated. Also by a certain change in volume of the surrounding medium, eg. By drying or swelling, taken into account.
  • the interface should additionally also have a very low heat capacity for hydrophilic "soft and configuration.
  • the little-defined contact area between sensor and environment is optimized and the negative, because undefined influence on a measurement eliminated or at least greatly reduced.
  • a low thermal conductivity and thermal capacity of the interface is advantageous, especially in thermal measuring methods, for example, with soil moisture sensors with heating element. This guarantees that a temperature change in the measuring sensor takes place due to the moisture of the surrounding medium and not due to the heat capacity of the interface.
  • the interface preferably also has a thermal decoupling effect. This is in contrast to ceramics, or even Kunststofferden, which themselves have a high thermal conductivity and in the case of ceramics do not allow complete displacement of the air in the pores by moisture. A measurement is thus falsified by 'ceramic properties'.
  • the interface, or the materials from which it is made still further desired properties
  • the interface is interchangeable and designed as a sensor or sensor head, in the case of a tensiometer, on the ceramic cap, turntable material.
  • This may also be a cap-shaped interface, for.
  • a fingerstall be, or, depending on the shape of the sensor also be composed of individual layers with openings for sensors, etc. interface.
  • the interface can also be firmly attached to a sensor / sensor head.
  • the material of the interface should absorb moisture from the surrounding medium and release it again so that there is no moisture difference between the interface and the surrounding medium. Therefore, hydrophilic, open-pored material is suitable, which in particular also has substantially the same pore size as that of the surrounding medium.
  • the interface should also be as corrosion-resistant and protected against rotting as possible. This is preferably accomplished by using suitable synthetic material, such as plastic, for example in the form of processed plastic fiber, as the article material. If the interface is or is attached to a sensor which is inserted into the ground, the interface material also has a certain mechanical stability, so that it does not break or break easily when pressed into the ground. Depending on the type of sensor, z. With sensor, If necessary, the interface surrounding the sensor may be surrounded by a stable but very open mechanical support. If possible, this support has no influence on a measurement and preferably makes a small area proportion of the sensor resp. an effective measuring range.
  • the support may be stable, preferably made of a solid material, such that a sensor or interface is protected by the tip of the support upon insertion of the sensor into a more solid mass of solid matter, such as compact earth.
  • An interface may also include a sensor or sensor head, e.g. As an existing ceramic, protect against external influences such as calcification and infestation of microorganisms, but also from mechanical influences. At very low cost, material and time, an interchangeable interface can be replaced, for. B. due to wear and aging of the interface or when using the sensor in another medium.
  • a sensor or sensor head e.g. As an existing ceramic, protect against external influences such as calcification and infestation of microorganisms, but also from mechanical influences.
  • an interchangeable interface can be replaced, for. B. due to wear and aging of the interface or when using the sensor in another medium.
  • the ratio of pores or cavities or passages in the material to the amount and distribution of the material itself should be optimized as much as possible so that the material as little as possible impairs a moisture exchange of the solid-state / interface. This is the case in particular for interfaces which are made of fibers, for example of felt, gauze, fleece, knitted fabric or fabric.
  • an interface is that conventional sensors can be provided with it and thus its accuracy and in particular reliability is substantially increased. In addition, such interfaces can be made very cheap. Via the interface, the contact surface between the sensor and the surrounding medium is optimized or enlarged or as in the case of volume reduction of the surrounding medium, for example, by shrinkage of soil by dehydration, a contact only made or guaranteed.
  • Fig. 1 is a tensiometer
  • Fig. 2 shows a detail of a sensor tip
  • FIG. 1 shows a tensiometer.
  • a water-filled pipe 1 is closed at its lower end by a cap of porous ceramic 2. The lower end is located at a certain depth below the bottom surface 5.
  • At the upper end of the tensiometer is the Wasserein Schollöfmung airtight seal by means of a closure 3.
  • In the upper part of the manometer 4 is attached, on which the pressure prevailing in the tube can be read.
  • water is now forced out of the tensiometer into the soil through the ceramic cap 2.
  • An imbalance of moisture always causes a pressure change in the tube, which is readable on the manometer.
  • the interaction of the moisture is only guaranteed with an optimal contact between the ceramic cap 2 and the surrounding earth.
  • Figure 2 shows a section through an inventive embodiment of the foremost part of the sensor tip of a tensiometer as shown in Figure 1. It can be seen the hollow and filled with water 6, porous ceramic cap 2, the felt with 7th is covered.
  • the felt may be in the form of a felt cap which can be slipped over the ceramic cap and which is exchangeable or also fixedly attached to the sensor. With the appropriate choice of felt, this easily absorbs moisture and releases it again so that there is no moisture difference between the felt and the surrounding medium.
  • felts made of synthetic fibers can be used which are largely resistant to fungi and do not rot. As soon as a felt no longer meets the requirements due to the aging phenomena, it can be replaced and replaced with little effort and expense.
  • the felt or other suitable materials such as open celled polyurethane foam, gauze, knit fabrics, woven fabric, nonwoven webs, and especially nonwoven webs made and wound from plastic fibers, have a thickness in a range of 1 to 10 mm, typically 3 to 7 mm, e.g. B. 5mm. Depending on the type of sensor and the surrounding mixture of solids, the thickness can be adjusted accordingly.
  • the softness or mechanical compliance of the interface allows adaptation to the undefined, non-uniform, grainy surface of soil or other solid media such as grain. Also, a certain reduction in volume of the surrounding earth due to dehydration is compensated for by the flexibility of the interface and, in particular, the size of the contact surface is defined or kept essentially the same.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Soil Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental Sciences (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

L'invention concerne un capteur utilisé pour mesurer la teneur en eau ou en humidité dans une substance solide, notamment un capteur d'humidité du sol, ainsi qu'un dispositif s'utilisant avec un capteur pour en améliorer sa précision. Ledit capteur ou au moins la partie du capteur conçue pour effectuer les mesures, est entouré(e) d'une interface, conçue de manière à absorber et à dégager de l'humidité et à être flexible sur le plan mécanique, de sorte que l'interface puisse être adaptée à une surface non constante et non clairement définie de la substance solide entourant le capteur, par ex. la terre. La surface de contact entre le capteur et la substance s'en trouve optimisée et des lames d'air, des empreintes de pièces, etc. sont compensées ou recouvertes. L'interface consiste de préférence en feutre à base de fibres synthétiques et est appliquée de manière remplaçable au-dessus d'un capteur ou d'une tête de détection.
EP06741616A 2005-06-07 2006-06-01 Dispositif s'utilisant avec un capteur pour ameliorer la precision et capteur a precision amelioree Withdrawn EP1889051A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH9592005 2005-06-07
PCT/CH2006/000291 WO2006131008A1 (fr) 2005-06-07 2006-06-01 Dispositif s'utilisant avec un capteur pour ameliorer la precision et capteur a precision amelioree

Publications (1)

Publication Number Publication Date
EP1889051A1 true EP1889051A1 (fr) 2008-02-20

Family

ID=36698877

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06741616A Withdrawn EP1889051A1 (fr) 2005-06-07 2006-06-01 Dispositif s'utilisant avec un capteur pour ameliorer la precision et capteur a precision amelioree

Country Status (6)

Country Link
US (1) US20080202219A1 (fr)
EP (1) EP1889051A1 (fr)
AU (1) AU2006255410A1 (fr)
CA (1) CA2611196A1 (fr)
IL (1) IL187773A0 (fr)
WO (1) WO2006131008A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI1000060B1 (pt) * 2010-01-04 2017-12-26 Embrapa - Empresa Brasileira De Pesquisa Agropecuária. Density sensor to assess voltage, potential and activity of liquids
DE102011056754A1 (de) * 2011-12-21 2013-06-27 Klaus Spohrer Bodenfeuchtesensor und Kalibrierungsverfahren hierzu
FI124197B (fi) * 2012-03-16 2014-04-30 Janesko Oy Mitta-anturi
BR102013009772B1 (pt) * 2013-04-22 2020-10-27 Embrapa - Empresa Brasileira De Pesquisa Agropecuária sensor de tensão de água, sistema para caracterização e medições contínuas de água no solo, sistema de indicação de tensão crítica no solo e haste de irrigação
WO2019002337A1 (fr) 2017-06-28 2019-01-03 Plantcare Ag Dispositif et procédé d'analyse de substrats pour végétation
IL253540A0 (en) * 2017-07-18 2017-09-28 I Dripper Ltd humidity sensor
IT201800006477A1 (it) * 2018-06-20 2019-12-20 Sistema esperto per la determinazione dell’evapotraspirazione reale di una superficie vegetata.
US11703438B2 (en) * 2018-10-19 2023-07-18 Hortau Inc. Porous medium parameter measurement device
WO2020225811A1 (fr) * 2019-05-04 2020-11-12 Korol Oleg Tensiomètre rempli d'eau pour déterminer les niveaux d'humidité du sol pour l'irrigation

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US2669689A (en) * 1945-04-13 1954-02-16 Schlumberger Well Surv Corp Method and apparatus for determining earth for mation factors
US3103117A (en) * 1960-06-22 1963-09-10 Lorenzo A Richards Tensiometer
US3477282A (en) * 1967-06-29 1969-11-11 Hygrodynamics Inc Ground moisture measuring apparatus
IL40467A (en) * 1972-09-29 1974-12-31 Tal A Tensiometer and automatic irrigation control system utilizing same
US3898872A (en) * 1973-10-19 1975-08-12 Soilmoisture Equipment Corp Tensiometer for soil moisture measurement
US3939699A (en) * 1974-09-27 1976-02-24 Mccormick John P Tensiometer with remote sensing unit
US4068525A (en) * 1976-09-20 1978-01-17 Soilmoisture Equipment Corporation Portable tensiometer for soil moisture measurement
US4137931A (en) * 1977-01-17 1979-02-06 Hasenbeck Harold W Conduction type soil matric potential sensor
US4206632A (en) * 1979-01-23 1980-06-10 Hirosuke Suzuki Liquid detecting device
US4531087A (en) * 1982-06-09 1985-07-23 Larson Glenn F Electrical sensor for measuring moisture in landscape and agricultural soils
US5179347A (en) * 1992-04-10 1993-01-12 Irrometer Company, Inc. Electrical sensor for sensing moisture in soils
US5465628A (en) * 1992-09-22 1995-11-14 Timmons; Robert D. Multiple sampling lysimeter
US5644947A (en) * 1995-01-19 1997-07-08 Lockheed Idaho Technologies Company Tensiometer and method of determining soil moisture potential in below-grade earthen soil
US5941121A (en) * 1997-04-17 1999-08-24 The Regents Of The University Of California Tensiometer for shallow or deep measurements including vadose zone and aquifers
US6752007B1 (en) * 2002-08-09 2004-06-22 The United States Of America As Represented By The United States Department Of Energy Horizontal advanced tensiometer
US6976386B1 (en) * 2002-10-31 2005-12-20 Battelle Energy Alliance, Llc Tensiometer methods
US20050097655A1 (en) * 2003-11-07 2005-05-12 Bascom Curtis B. Brimless lined elastic head covering
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Also Published As

Publication number Publication date
AU2006255410A2 (en) 2006-12-14
WO2006131008A1 (fr) 2006-12-14
IL187773A0 (en) 2008-08-07
CA2611196A1 (fr) 2006-12-14
US20080202219A1 (en) 2008-08-28
AU2006255410A1 (en) 2006-12-14

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