Soil survey device and system for precision agriculture

• US 6,608,672 B1
• Filed: 04/12/2001
• Issued: 08/19/2003
• Est. Priority Date: 03/15/1999
• Status: Expired due to Term

• Current Assignee: Tokyo University of Agriculture and Technology
• Original Assignee: Omron Corporation
• Inventors: Ohtomo, Atushi, Shibusawa, Sakae, Hirako, Shinichi
• Primary Examiner(s): Spyrou, Cassandra
• Assistant Examiner(s): ASSAF, FAYEZ G
• Application Number:
  US09/700,305
• Time in Patent Office: 859 Days
• Field of Search: 356/73, 356/445, 356/417, 356/418, 250/341.2, 250/339.11, 250/339.12, 250/341.8
• US Class Current: 356/73
• CPC Class Codes: A01B 79/005 Precision agriculture
• CPC Class Codes: A01C 21/007 Determining fertilization requirements
• CPC Class Codes: G01N 2021/3155 Measuring in two spectral ranges, e.g. UV and visible
• CPC Class Codes: G01N 21/3563 for analysing solids; Preparation of samples therefor
• CPC Class Codes: G01N 21/359 using near infrared light
• CPC Class Codes: G01N 33/24 Earth materials G01N33/42 takes precedence
• CPC Class Codes: Y02A 40/10 in agriculture

Abstract

An optical soil survey device to survey the optical characteristics of a given underground soil, a soil survey device to survey the soil, a soil survey system and a mobile soil survey vehicle to survey the soil are disclosed. The disclosed devices and systems may be used to survey the characteristics of a given soil for agricultural purposes. This survey can be carried out without experiencing significant resistance from the soil. A plow-shaped optical soil survey device may be provided with a plow-shaped main unit, whose forward extremity turns up soil; a frame, which supports the sensor and connects a tractor and a main unit; a spectrometer, which is mounted on the frame; a wheel, which surveys the depth of the furrow and is connected to the main unit via an arm; and a survey control unit, which is mounted on the tractor.

Claims

1. An optical soil survey device for precision field management to survey the optical characteristics of a given soil by creating a survey chamber at a selected depth under the ground and surveying the spectrum of light reflected off the soil in the chamber continuously and in real time, said optical soil survey device comprising:

a casing which encloses at least an upper survey surface of the chamber;

a shank connected to said casing which is narrower than said casing and which cuts open the soil and declined slightly backwardly;

a soil excavation unit having a first penetration unit which is a conical shaped piece with a tapered front end, and a second penetration unit with a gradual increase in diameter which extends away from said first penetration unit, so as to form a space between the ground and said second penetration unit, said soil excavation unit being mounted in front of said casing and held in horizontal direction; and

a position detecting means to detect a position of the soil which is to be the subject of the survey; and

a spectrum of light surveying means to survey the spectrum of light reflected off the soil at the position detected by said position detecting means, thereby producing survey data of the spectrum of light corresponding to each position data.

2. An optical soil survey device according to claim 1, further comprising a depth detecting means to detect the depth of the soil, thereby producing survey data of each spectrum of light corresponding to the position and the depth.

3. An optical soil survey device according to claim 1, further comprising an image capturing means to capture an image of the soil, thereby producing survey data of each spectrum of light and each image of the soil corresponding to the position.

4. An optical soil survey device according to claim 1, further comprising:

a depth detecting means to detect the depth of the soil, and

an image capturing means to capture an image of the soil, thereby producing survey data of each spectrum of light and each image of the soil corresponding to the position and the depth.

5. An optical soil survey device according to claim 1, further comprising:

a position detecting means to detect a position of the soil which is to be the subject of the survey;

a sensing means to sense the characteristics of the soil;

a light splitting means to split the light, which is to be collected by said sensing means; and

an optical characteristics survey means to survey the optical characteristics of the soil based on the spectral data produced by said light splitting means.

6. An optical soil survey device according to claim 5, wherein said sensing means comprises:

a light projecting means to project light having a wavelength in the visible and near-infrared region;

a first light receiving means to receive the light projected by said light projecting means which has a wavelength in the visible region;

a second light receiving means to receive the light projected by said light projecting means which has a wavelength in the near-infrared region; and

an image capturing means to capture an image of the soil.

7. An optical soil survey device according to claim 6, wherein said light splitting means comprises:

a first light splitting means to split the light received by said first light receiving means, which has a wavelength in the visible region; and

a second light splitting means to split the light received by said second light receiving means, which has a wavelength in the near-infrared region.

8. An optical soil survey device according to claim 6, further comprising:

an image receiving means to receive the image data captured by said image capturing means; and

a reliability calculating means to calculate the reliability of the received split light by the image data received by said image receiving means, thereby canceling the survey of the soil if the reliability calculated by said reliability calculating means is low.

9. An optical soil survey device according to claim 8, wherein said reliability calculating means calculate said reliability by shooting a slit beam to the surface of the soil surface.

10. An optical soil survey device according to claim 6, further comprising:

an image receiving means to receive the image data captured by said image capturing means; and

a reliability calculating means to calculate the reliability of the received split light by the image data received by said image receiving means, thereby storing the reliability calculated by the calculation device.

11. An optical soil survey device according to claim 10, wherein said reliability calculating means calculate said reliability by shooting a slit beam to the surface of the soil surface.

12. An optical soil survey device according to claim 6, further comprising a temperature detecting means to detect the temperature of the soil.

13. An optical soil survey device for precision field management to survey the optical characteristics of a given soil creating a survey chamber at a selected depth under the ground and surveying the spectrum of light reflected off the soil in the chamber continuously, said optical soil survey device comprising:

a soil excavation unit which excavates the soil parallel to the surface of the ground at a selected depth below the ground, said soil excavation unit having a first penetration unit which is a conical shaped piece with a tapered front end, and a second penetration unit with a gradual increase in diameter which extends away from said first penetration unit, so as to form a space between the ground and said second penetration unit, said soil excavation unit being held in horizontal direction;

a casing which is connected to said soil excavation unit and encloses at least the upper surface of the survey chamber;

a sensing unit which senses the characteristics of the soil inside said casing;

a shank connected to said casing but with a diameter which is less than that of said casing, and declined slightly backwardly, which cuts open the soil; and

a pair of guide panels which guide the soil piled up on the survey surface by the action of said shank back toward the shaft created by said shank.

14. An optical soil survey device according to claim 13, further comprising:

a penetration unit on the front of said soil excavation unit, which creates a cylindrical tunnel; and

a smoothing pan el which is mounted at the front of said sensing unit to create a flat survey surface at the bottom of the cylindrical tunnel, and said sensing unit thereby surveying the characteristics of the soil.

15. An optical soil survey device according to claim 13, further comprising an opening in the rear side of said sensing unit so that any soil which gets into the survey chamber can escape through the rear.

16. An optical soil survey device according to claim 13, wherein said shank is placed on top of said soil excavation unit and angled slightly away from the direction in which said device moves.

17. A soil survey device used for precision field management to survey a given underground soil surface while moving parallel to the surface of the ground, comprising:

a sensor to survey the soil;

a casing which encloses at least the upper surface and two sides of a survey chamber in which said sensor is to survey the soil;

a soil excavation unit which is provided on the front of said casing and which excavates the underground soil as said soil survey device moves forward, said soil excavation unit having a first penetration unit which is a conical shaped piece with a tapered front end, and a second penetration unit with a gradual increase in diameter which extends away from said first penetration unit so as to form a space between the ground and said second penetration unit, said soil excavation unit being held in horizontal direction; and

a shank which is connected to the top of said casing and protects said casing and declined slightly backwardly, and which has a V-shaped portion on at least a tip in contact with the earth to cut open the soil as said device moves along horizontally, and wherein said shank is narrower than said casing.

18. A soil survey device according to claim 17, wherein said sensor is supported within said casing facing downward toward the subject of sensing, said casing is provided with a continuous opening from the bottom to the rear of said casing, said rear opening of said casing is small enough to prevent the survey chamber from filling up with particles of the soil turned up by said soil excavation unit, and said sensor is mounted far enough from the rear opening so that any soil which may enter through the rear opening will not end up in the surveying area defined by said sensor.

19. A soil survey device according to claim 18, further comprising a smoothing panel to smooth the survey surface of the soil cut open by the front of said casing, said smoothing panel being supported by said casing in such a way that said smoothing panel is angled downward toward the survey surface.

20. A soil survey device according to claim 18, wherein said soil excavation unit has a round cross section and digs a cylindrical tunnel, said smoothing panel flattens a portion of the tunnel so that the floor of the tunnel is level.

21. A soil survey device used for precision field management to survey a given underground soil surface while moving parallel to the surface of the ground, comprising:

an illumination device to illuminate the soil surface;

a first image capturing device to capture a two-dimensional image, which surveys the soil surface illuminated by said illumination device;

a sensor which surveys the portion of the soil surface imaged by said first image capturing device and outputs a signal corresponding to the composition of the surveyed soil;

a first feature counting means to generate a feature count, which processes the image of the soil captured by said first image capturing device and generates a feature count expressing the unevenness of the soil surface;

a first reliability calculating means to calculate reliability, which calculates and outputs the reliability of the signal output by said sensor based on the feature count generated by said first feature counting means;

a casing which encloses at least the upper surface and two sides of a survey chamber in which said sensor is to survey the soil;

a soil excavation unit which is provided on the front of said casing and which excavates the underground soil as said soil survey device moves forward, said soil excavation unit having a first penetration unit which is a conical shaped piece with a tapered front end, and a second penetration unit with a gradual increase in diameter which extends away from said first penetration unit so as to form a space between the ground and said second penetration unit, said soil excavation unit being held in horizontal direction;

a shank which is connected to the top of said casing and protects said casing and declined slightly backwardly, and which has a V-shaped portion on at least a tip in contact with the earth to cut open the soil as said device moves along horizontally, the width of said shank being narrower than said casing; and

a pair of guide panels which guide the soil piled up on the soil surface by the action of said shank back toward the furrow created by said shank.

22. An optical soil survey device according to claim 21, wherein said reliability calculating means calculate said reliability by shooting a slit beam to the surface of the soil surface.

23. A soil survey device used for precision field management to survey a given underground soil surface while moving parallel to the surface of the ground, comprising:

an illumination device to illuminate the soil surface;

a first image capturing device to capture a two-dimensional image, which surveys the soil surface illuminated by said illumination device;

a sensor which surveys the portion of the soil surface imaged by said first image capturing device and outputs a signal corresponding to the composition of the surveyed soil;

a first feature counting means to generate a feature count, which processes the image of the soil captured by said first image capturing device and generates a feature count expressing the unevenness of the soil surface;

a casing which encloses at least the upper surface and two sides of a survey chamber in which said sensor is to survey the soil;

a soil excavation unit which is provided on the front of said casing and which excavates the underground soil as said soil survey device moves forward, said soil excavation unit having a first penetration unit which is a conical shaped piece with a tapered front end, and a second penetration unit with a gradual increase in diameter which extends away from said first penetration unit so as to form a space between the ground and said second penetration unit, said soil excavation unit being held in horizontal direction; and

a shank which is connected to the top of said casing and protects said casing and declined slightly backwardly, and which has a V-shaped portion on at least a tip in contact with the earth to cut open the soil as said device moves along horizontally, the width of said shank is narrower than said casing; and

a pair of guide panels which guide the soil piled up on the soil surface by the action of said shank back toward the furrow created by said shank.

24. A soil survey system to survey a given underground soil surface used for precision field management, comprising:

a soil survey device used for precision field management to survey a given underground soil surface while moving parallel to the surface of the ground, said soil survey device comprising;

a sensor to survey the soil;

a casing which encloses at least the upper surface and two sides of a survey chamber in which said sensor is to survey the soil;

a soil excavation unit which is provided on the front of said casing and which excavates the underground soil as said soil survey device moves forward, said soil excavation unit having a first penetration unit which is a conical shaped piece with a tapered front end, and a second penetration unit with a gradual increase in diameter which extends away from said first penetration unit so as to form a space between the ground and said second penetration unit, said soil excavation unit being held in horizontal direction;

a shank which is connected to the top of said casing and protects said casing and declined slightly backwardly, and which has a V-shaped portion on at least a tip in contact with the earth to cut open the soil as said device moves along horizontally, said shank being narrower than said casing;

said soil survey system further comprising;

a current position data acquisition device to acquire the current position of said soil survey device; and

a data recording means to record a surveying data of the output data obtained from said soil survey device and the position data obtained from said current position data acquisition device.

25. A soil survey system according to claim 24, further comprising a data transmission means to transmit said surveying data obtained from said data recording means.

26. A mobile survey vehicle to move in a field equipped with a soil survey system to survey a given underground soil surface used for precision field management, said soil survey system comprising:

a soil survey device used for precision field management to survey a given underground soil surface while moving parallel to the surface of the ground, said soil survey device comprising;

a sensor to survey the soil;

a casing which encloses at least the upper surface and two sides of a survey chamber in which said sensor is to survey the soil;

a soil excavation unit provided on the front of said casing and which excavates the underground soil as said soil survey device moves forward, said soil excavation unit having a first penetration unit which is a conical shaped piece with a tapered front end, and a second penetration unit with a gradual increase in diameter which extends away from said first penetration unit so as to form a space between the ground and said second penetration unit, said soil excavation unit being held in horizontal direction;

a shank which is connected to the top of said casing and protects said casing and declined slightly backwardly, and which has a V-shaped portion on at least a tip in contact with the earth to cut open the soil as said device moves along horizontally, said shank being further characterized that the width of said shank is narrower than said casing;

said soil survey system further comprising;

a current position data acquisition device to acquire the current position of said soil survey device; and

a data recording means to record a surveying data of the output data obtained from said soil survey device and the position data obtained from said current position data acquisition device.

27. A mobile survey vehicle for use in precision field management, said mobile survey vehicle adapted to survey a given underground soil surface while moving parallel to the surface of the ground, said mobile survey vehicle comprising:

a soil survey device, comprising;

a sensor to survey the soil;

a casing which encloses at least the upper surface and two sides of a survey chamber in which said sensor is to survey the soil;

a soil excavation unit which is provided on the front of said casing and which excavates the underground soil as said soil survey device moves forward, said soil excavation unit having a first penetration unit which is a conical shaped piece with a tapered front end, and a second penetration unit with a gradual increase in diameter which extends away from said first penetration unit so as to form a space between the ground and said second penetration unit, said soil excavation unit being held in horizontal direction; and

a shank which is connected to the top of said casing and protects said casing and declined slightly backwardly, and which has a V-shaped portion on at least a tip in contact with the earth to cut open the soil as said device moves along horizontally, said shank being narrower than said casing;

wherein said mobile survey vehicle further comprises;

a current position data acquisition device to acquire the current position of said soil survey device;

a depth surveying means to survey depth, which surveys the depth of the soil survey surface surveyed by said soil survey device; and

a data recording means to record a surveying data of the output data obtained from said soil survey device, and the position data obtained from said current position data acquisition device and the depth data obtained from said depth surveying means.

28. A mobile survey vehicle according to claim 27, wherein said depth surveying means comprises a wheel rotatably supported by an arm which is connected to said shank, said wheel being rotated on the surface of the ground as said mobile survey vehicle moves, such that said depth data is calculated from the angle of said arm.

29. An optical soil survey device for precision field management to survey the optical characteristics of a given soil by creating a survey chamber at a selected depth under the ground and surveying the spectrum of light reflected off the soil in the chamber continuously and in real time, said optical soil survey device comprising:

a casing which encloses at least an upper survey surface of the chamber;

a shank connected to said casing which is narrower than said casing and which cuts open the soil and declined slightly backwardly;

a soil excavation unit having a first penetration unit which is a conical shaped piece with a tapered front end, and a second penetration unit with a gradual increase in diameter which extends away from said first penetration unit, so as to form a space between the ground and said second penetration unit, said soil excavation unit being mounted in front of said casing and held in horizontal direction; and

a position detecting means to detect a position of the soil which is to be the subject of the survey;

a sensing means to sense the characteristics of the soil;

a light splitting means to split the light, which is to be;

collected by said sensing means; and

an optical characteristics survey means to survey the optical characteristics of the soil based on the spectral data produced by said light splitting means.