Unwanted plant removal system having a stabilization system

Patent metadata

Field	Value
Publication number	US-9609859-B2
Application number	US-201314027120-A
Country	US
Kind code	B2
Filing date	Sep 13, 2013
Priority date	Sep 13, 2013
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

An apparatus and methods are provided for removing unwanted plants or weeds from an area such as an agricultural plot or lawn. The apparatus includes a three-dimensional imager configured to capture plant images and locate plants; an image processor configured to distinguish between wanted and unwanted plants based upon the captured plant images; at least one removal device configured to damage a target on the unwanted plants; a guidance system configured to direct at least one laser beam toward the unwanted plant; a stabilization system configured to provide feedback compensation to one or both of the three-dimensional imager and the guidance system; and a chassis configured to support the three-dimensional imager, the laser device, the guidance system, and the stabilization system. The chassis is configured to be moved across the area.

First claim

What is claimed is:

1. An apparatus comprising: a three-dimensional imager configured to capture plant images; an image processor configured to distinguish between a wanted plant and an unwanted plant based on the captured plant images; at least one removal device configured to damage a target on the unwanted plant; a guidance system comprising a galvo mirror configured to direct the at least one removal device towards the unwanted plant; a stabilization system comprising: a stabilization camera having adjustable optics and configured to provide feedback compensation to the galvo mirror, and an accelerometer configured to provide feedback compensation to the stabilization camera and the galvo mirror, wherein a position of the galvo mirror is adjusted and the adjustable optics are adjusted based on the feedback compensation; and a chassis configured to support the three-dimensional imager, the removal device, the guidance system, and the stabilization system.

2. An apparatus according to claim 1 , wherein the imager comprises a camera that includes stabilization lenses for low light image stabilization.

3. An apparatus according to claim 1 , wherein the at least one removal device comprises one or more of a laser device, an herbicide application device, or a flame thrower.

4. An apparatus according to claim 1 , wherein the at least one removal device comprises a laser device configured to emit a laser beam towards and unwanted plant.

5. An apparatus according to claim 4 , wherein the laser device comprises an array of semiconductor lasers.

6. An apparatus according to claim 4 , wherein the laser device comprises at least one semiconductor laser configured to emit a laser beam having a wavelength of from about 430 nm to about 475 nm or from about 650 nm to about 675 nm.

7. An apparatus according to claim 1 , wherein the stabilization system comprises a three-axis accelerometer sensor.

8. An apparatus according to claim 7 , wherein the three-axis accelerometer sensor is configured to sense low frequency mechanical vibrations having a frequency of less than about 500 Hz.

9. An apparatus according to claim 1 , wherein the stabilization system comprises a gyroscopic motion sensor.

10. An apparatus according to claim 1 , wherein the chassis in configured to be moved across an area.

11. An apparatus according to claim 1 , wherein the three-dimensional imager comprises a light source with one or more scanning beams, collection optics, and one or more detectors.

12. An apparatus according to claim 1 , wherein the apparatus is capable of non-mechanical phased array beam steering.

13. An apparatus according to claim 1 , wherein the apparatus comprises a non-mechanical phased array beam steering module.

14. An apparatus according to claim 13 , wherein the non-mechanical phased array beam steering module comprises a cylindrical MEMS mirror.

15. An apparatus according to claim 1 , wherein the removal device can emit a laser beam having an adjustable wavelength based upon information from the image processor.

16. An apparatus according to claim 1 , wherein the imager, the removal device, and the guidance system is supported by the chassis can sense and adjust in all three-dimensions including vertical.

17. An apparatus according to claim 1 , wherein the chassis comprises a three-dimensional gyro accelerometer sensor.

18. A lawn weeding system comprising:
a lawn mower comprising cutting means; and
an apparatus according to claim 1 , wherein the chassis is mechanically coupled to the lawn mower.

19. A method of removing unwanted plants comprising: capturing plant images using a three-dimensional imager; distinguishing between a wanted plant and an unwanted plant after capturing plant images; locating a target on the unwanted plant; guiding, using a galvo mirror, a removal device to the unwanted plant; providing feedback compensation to the galvo mirror using a stabilization camera having adjustable optics; providing feedback compensation to the stabilization camera and the galvo mirror; adjusting a position of the galvo mirror based on the feedback compensation of the stabilization camera and the galvo mirror; adjusting the adjustable optics based on the feedback compensation of the stabilization camera and the galvo mirror; directing output from the removal device to the target on the unwanted plant; and damaging the target on the unwanted plant with the output from the removal device; wherein a chassis supports the three-dimensional imager, the removal device, and the stabilization system.

20. A method according to claim 19 further comprising moving the three-dimensional imager, the removal device, and the stabilization system across a designated area.

Assignees

• Palo Alto Res Ct Inc

Inventors

• Stowe Timothy David
• Maeda Patrick Yasuo
• Curley Tim

Classifications

• A01D34/015

  Cutting mechanisms not covered by another group · CPC title

• A01D34/835

  specially adapted for particular purposes · CPC title

• A01M21/04

  Apparatus for destruction by steam, chemicals, burning, or electricity {(apparatus for burning A01M15/00)} · CPC title

• A01M15/00

  Flame-throwers specially adapted for purposes covered by this subclass · CPC title

• A01M21/046 Primary

  by electricity · CPC title