WO1986000420A1 - Procede et dispositif pour la detection sans contact de plantes - Google Patents

Procede et dispositif pour la detection sans contact de plantes Download PDF

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Publication number
WO1986000420A1
WO1986000420A1 PCT/SE1985/000261 SE8500261W WO8600420A1 WO 1986000420 A1 WO1986000420 A1 WO 1986000420A1 SE 8500261 W SE8500261 W SE 8500261W WO 8600420 A1 WO8600420 A1 WO 8600420A1
Authority
WO
WIPO (PCT)
Prior art keywords
plants
signals
signal
plant
light
Prior art date
Application number
PCT/SE1985/000261
Other languages
English (en)
Inventor
Anders WALLENA^oS
Carl Tyrén
Original Assignee
Enpece Ab
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 Enpece Ab filed Critical Enpece Ab
Publication of WO1986000420A1 publication Critical patent/WO1986000420A1/fr
Priority to DK86586A priority Critical patent/DK86586D0/da

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers

Definitions

  • the present invention relates to a method and a device for non-contact detection of plants.
  • the device based on this method is characterized by an optical system for collecting reflected light from a surface, a beam splitter for dividing the reflected light into at least two light beams, an interference filter for each of said light beams for filtration thereof to a predetermined wavelength, a photodiode for each of said wavelengths for conversion thereof into an electric signal, an operational amplifier for each of said signals for amplification thereof, a divider for receiving said two signals and dividing them to provide a ratio signal, and a comparator for comparing said ratio signal with a preselected reference signal to provide an output signal indicating the presence/non-presence of a plant on said surface.
  • Fig. 1 is an optical/electric block diagram illu ⁇ strating the mode of operation of the device
  • FIG. 2 schematically illustrates one of many conceivable applications of the invention.
  • Fig. 3 is a diagram showing the intensity of reflection as a function of the wavelength.
  • the method and the device according to the inven ⁇ tion for non-contact "seeing" detection of plants are based on spectral signature.
  • the detecting device is viewing two specific wavelengths in the reflection spectrum from the surface it is scanning at the moment. These two wavelengths have a characteristic intensity relation for plants, which is directly converted into the single output signal representing presence/non- presence of a plant or, shorter, plant/non-plant.
  • the principle of detection is based on optical signature.
  • the intensity relation between the wavelength 680 nm and 730 nm decides whether a plant should be indicated or not in the output signal of the detecting device.
  • 680 nm is one of the wave ⁇ lengths of light which is heavily absorbed by the chlorophyll of the plant. The intensity of this wave- length therefore is very low in the reflection spectrum from a plant.
  • 730 nm is a wavelength which the plant reflects very intensely. The intensity of this wave ⁇ length therefore is very high in the reflection spectrum from a plant.
  • Fig. 3 is an example of this reflection spectrum from sugar beets or, more exactly, their tops.
  • the detecting device As schematically shown in Fig. 1, the detecting device, generally designated 1, is enclosed in a dust and moisture-proof casing 2.
  • the detecting device has a rotary scanner 3 with mirrors 4 sweeping the surface 5 to be detected.
  • the light 6 reflected from the surface 5 is collected through the scanner 3 by an optical system 7.
  • this optical system has a diaphragm device 8 with two lenses 9 and two lenses 10, as well as an aperture 11 displaced between these two pairs of lenses in the common focus thereof for eliminating stray light from the reflected light 6.
  • the optical system 7 also has a collecting device 38 with two lenses 12 for receiving the light 6, freed from stray light, and conducting it to a beam splitter 13.
  • the beam splitter 13 consists of a semi-reflecting mirror dividing the reflected light 6 into two light beams 14 and 15. Each of these two light beams 14 and 15, by a respective interference filter 16 and 17 of about 680 nm and about 730 nm, respectively, reaches a photodiode 18, 19 for conversion into electric signals 20, 21.
  • the signals 20, 21 emitted by the photodiodes 18 ' and 19 are amplified each by an operational amplifier 22, 23 of the FET type having constant gain and, after further amplification 1,10 or 100 times by amplifiers 24, 25 adjustable in parallel, are both supplied to an analogue divider 26 in which the 680 nm signal is inserted in the numerator.
  • the output or ratio signal 27 from the divider 26 will thus reach its minimum when the detecting device is viewing a plant.
  • a comparator 28 compares the ratio signal 27 from the analogue divider with a preselected reference signal 29 for providing an output signal 30 indicating the presence/non-presence of a plant 31 on the surface 5.
  • the output signals 30 from the detecting device 1 may in turn be used as control signals in order, by the ' intermediary of a microcomputer, to control different types of means for processing and/or treating the detected plant 31 or other plants spaced therefrom by a predetermined distance, or the area surrounding said plants.
  • Fig. 2 shows one of many conceivable applications of the invention. More precisely, the detecting device 1 is here mounted on one side of a hoe 32 for hoeing row crops, for instance sugar beets 33.
  • the hoe 32 is either drawn or carried by a tractor 34 and has a plurality of hoeing knives 35 for hoeing between the rows of crop 33. To prevent the soil loosened by the knives 35 from covering small plants, protecting discs 36 are used.
  • the detecting device 1 is so disposed on the hoe 32 that it will be located straight above a row of crop 33 immediately to the right of the hoe, or midway between two rows.
  • the hoe 32 is provided on either side with a steerable wheel 37.
  • the wheels 37 are operably connected to and controllable by means of the detecting device 1.
  • the detecting device 1 will detect this circumstance by sensing that the crop 33 is not located straight underneath the scanner 3, whereby the detecting device 1 emits a control signal to the operating mechanism for steering the wheels 37 in the direction required to return the hoe 32 to its correct lateral position.
  • the optical detecting device 1 in principle is an optical transducer which by means of two optical filters and two photo ⁇ diodes discriminates between plant and non-plant.
  • the transducer can be made more or less sophisti ⁇ cated with a scanner as illustrated and described, or a stationary mirror, depending on the field of application. If the information from the detecting device and other transducers, for instance a transducer indicating the distance travelled, is processed by a microcomputer and its program, many different appli ⁇ cations can be obtained.
  • the scanner 3 of the detecting device 1 is scanning sideways trans ⁇ versely of the direction of travel of the tractor 34 and the hoe 32.
  • the scanner 3 can also be arranged for scanning in the longitudinal or the vertical direction.
  • the latter application may be advantageous, for instance when topping sugar beets, in which case the scanner 3 may operate such that the detecting device 1 detects where the tops begin on the beet. This information may then be used for controlling a topper assembly which will correctly top every beet.

Landscapes

  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

Dans un procédé et un dispositif pour la détection sans contact de plantes (31), la lumière réfléchie (6) est collectée à partir d'une surface (5) grâce à un système optique (7). Cette lumière réfléchie (6) est divisée grâce à un diviseur de faisceau (13) en deux faisceaux lumineux (14, 15) dont chacun est filtré par un filtre interférentiel (16, 17) à une longueur d'onde prédéterminée respective. Deux photodiodes (18, 19) convertissent une longueur d'onde (14, 15) en un signal électrique (20, 21), chacun des signaux étant amplifié dans un amplificateur fonctionnel respectif (22, 23). Un diviseur (26) reçoit les deux signaux (20, 21) et les divise afin d'émettre un signal de rapport (27). Ce signal de rapport (27) est comparé dans un comparateur (28) avec un signal de référence présélectionné (29) afin d'émettre un signal de sortie (30) indiquant la présence/l'absence d'une plante (31) sur la surface.
PCT/SE1985/000261 1984-06-25 1985-06-24 Procede et dispositif pour la detection sans contact de plantes WO1986000420A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK86586A DK86586D0 (da) 1984-06-25 1986-02-25 Fremgangsmaade og apparatur til beroeringsfri detektering af vaekster

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8403364-6 1984-06-25
SE8403364A SE443050B (sv) 1984-06-25 1984-06-25 Metod och anordning for beroringsfri detektering av vexter

Publications (1)

Publication Number Publication Date
WO1986000420A1 true WO1986000420A1 (fr) 1986-01-16

Family

ID=20356330

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1985/000261 WO1986000420A1 (fr) 1984-06-25 1985-06-24 Procede et dispositif pour la detection sans contact de plantes

Country Status (5)

Country Link
EP (1) EP0215795A1 (fr)
AU (1) AU4547985A (fr)
DK (1) DK86586D0 (fr)
SE (1) SE443050B (fr)
WO (1) WO1986000420A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3909434A1 (de) * 1988-07-27 1990-02-01 Georg Diamantidis Einrichtung zur visuellen betrachtung der chlorophyllfluoreszenz in der umwelt
EP0653051A1 (fr) † 1992-07-28 1995-05-17 Patchen California, Inc. Procede et structure permettant de distinguer un objet d'un autre objet
KR20040012255A (ko) * 2002-08-02 2004-02-11 대한민국(관리부서:농촌진흥청) 엽록소 측정 장치
EP1394530A1 (fr) * 2002-08-27 2004-03-03 Amazonen-Werke H. Dreyer GmbH & Co. KG Dispositif pour la détection sans contact de la végétation dans un champ
DE102006002437A1 (de) * 2006-01-11 2007-07-12 Agrocom Gmbh & Co. Agrarsysteme Kg Messvorrichtung
WO2010126879A1 (fr) * 2009-04-29 2010-11-04 Monsanto Technology Llc Systèmes et procédés de mesure biométrique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU632326B2 (en) * 1989-05-09 1992-12-24 Biggs & Sons Pty. Limited Detection system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2009393A (en) * 1977-09-16 1979-06-13 Pickett A J F Photoelectric investigation of crops
US4308456A (en) * 1979-11-19 1981-12-29 Versatile Integrated Modules Method and apparatus for measuring the frequency of radiation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2009393A (en) * 1977-09-16 1979-06-13 Pickett A J F Photoelectric investigation of crops
US4308456A (en) * 1979-11-19 1981-12-29 Versatile Integrated Modules Method and apparatus for measuring the frequency of radiation

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3909434A1 (de) * 1988-07-27 1990-02-01 Georg Diamantidis Einrichtung zur visuellen betrachtung der chlorophyllfluoreszenz in der umwelt
EP0653051A1 (fr) † 1992-07-28 1995-05-17 Patchen California, Inc. Procede et structure permettant de distinguer un objet d'un autre objet
EP0653051B2 (fr) † 1992-07-28 2001-11-28 Patchen, Inc. Procede et structure permettant de distinguer un objet d'un autre objet
KR20040012255A (ko) * 2002-08-02 2004-02-11 대한민국(관리부서:농촌진흥청) 엽록소 측정 장치
EP1394530A1 (fr) * 2002-08-27 2004-03-03 Amazonen-Werke H. Dreyer GmbH & Co. KG Dispositif pour la détection sans contact de la végétation dans un champ
DE102006002437A1 (de) * 2006-01-11 2007-07-12 Agrocom Gmbh & Co. Agrarsysteme Kg Messvorrichtung
WO2010126879A1 (fr) * 2009-04-29 2010-11-04 Monsanto Technology Llc Systèmes et procédés de mesure biométrique
EP2424344A1 (fr) * 2009-04-29 2012-03-07 Monsanto Technology LLC Systèmes et procédés de mesure biométrique
US20120113225A1 (en) * 2009-04-29 2012-05-10 Monsanto Technology Llc Biometric measurement systems and methods
US9423249B2 (en) 2009-04-29 2016-08-23 Monsanto Technology Llc Biometric measurement systems and methods

Also Published As

Publication number Publication date
DK86586A (da) 1986-02-25
EP0215795A1 (fr) 1987-04-01
DK86586D0 (da) 1986-02-25
SE8403364D0 (sv) 1984-06-25
SE8403364L (sv) 1985-12-26
AU4547985A (en) 1986-01-24
SE443050B (sv) 1986-02-10

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