Ground moisture sensor with a lateral plane antenna

• US 5,908,045 A
• Filed: 02/04/1997
• Issued: 06/01/1999
• Est. Priority Date: 02/04/1997
• Status: Expired due to Term

• Current Assignee: Blair Arthur Wallace, Richard Garth Webster
• Original Assignee: Blair Arthur Wallace, Richard Garth Webster
• Inventors: Webster, Richard Garth, Wallace, Blair Arthur
• Primary Examiner(s): CHAMBERS, A MICHAEL
• Application Number:
  US08/794,469
• Time in Patent Office: 847 Days
• Field of Search: 137/624.12, 137/78.3, 137/1, 137/2, 239/64, 239/70
• US Class Current: 137/78.3
• CPC Class Codes: A01G 25/167 Control by humidity of the soil itself or of devices simulating soil or of the atmosphere; Soil humidity sensors
• CPC Class Codes: Y10T 137/189 Soil moisture sensing

Abstract

An irrigation system is disclosed for determining that the moisture content of various zones of the soil are irrigated to consistent levels. A moisture sensor has lateral spaced apart antennas which extend within a horizontal plane. The moisture sensor is disposed in the soil within one of the various regions. An irrigation piping branch includes a control valve which controls the flow of water through the irrigation branch. When the control valve is open, an irrigation fluid will pass through the valve and the irrigation branch for distribution to an irrigation region of the soil. Once the moisture within the soil of the irrigation region reaches a preselected level within the horizontal plane proximate to the moisture sensor, the valve will automatically be closed, stopping the flow of the irrigation fluid from the irrigation branch to the irrigation region of the soil. The irrigation system includes an irrigation branch and a moisture sensor may be located proximate to a building foundation for maintaining consistent levels of moisture within the soil beneath the foundation. The irrigation system further includes a piping branch which extends into an irrigation zone having multiple regions. A master valve controls the flow of irrigation fluid into the piping branch, and secondary valves are disposed within separate sections of the piping branch for controlling the flow of irrigation fluids to corresponding ones of the multiple regions. Moisture sensors are disposed in various ones of the multiple regions for separately controlling corresponding ones of the secondary valves.

Claims

1. A method for distributing water to soil, comprising the steps of:

providing a pipe system having at least one branch, with an electrically actuated valve disposed therein for controlling the flow of water through at least part of the branch;

providing a primary system controller for selectively applying electric power to actuate the electrically actuated valve;

providing a moisture sensor having an exterior housing and two laterally spaced apart antennas which extend from the exterior housing, each of the antennas including a short section and a main body section, wherein the short sections extend from the exterior housing and bend to define the main body sections, the main body sections are spaced apart to extend substantially within a laterally extending, singular horizontal plane, and the short sections extend in relation to the main body sections such that an effective region of investigation of the moisture sensor is defined within the singular horizontal plane;

electrically connecting the electrically actuated valve to the primary system controller, with the moisture sensor connected directly therebetween for switching an electrical power leg extending between the primary system controller and the electrically actuated valve;

burying the moisture sensor within the soil, such that the main body sections and the effective region of investigation defined by the main body sections of the antennas of the moisture sensor are disposed substantially within the laterally extending, single horizontal plane at a preselected depth, and the short sections of the antennas extend downward therefrom, such that the external housing of the moisture sensor is disposed beneath the main body sections of the antennas;

actuating the primary system controller, such that power is applied to the electrical power leg, the moisture sensor and the electrically actuated valve to selectively actuate the electrically actuated valve and pass water through the pipe system to a portion of the soil;

detecting with the main body sections of the antennas of the moisture sensor when the water level within the portion of the soil is disposed at a preselected depth, corresponding to the laterally extending, single horizontal plane disposed at the preselected depth; and

automatically closing the electrically actuated valve in response to detecting the water level being disposed at the preselected depth within the soil.

2. The method according to claim 1, further comprising the steps of:

separately restricting the flow of water through different sections of said branch in response detecting that the water levels within different portions of the soil are disposed at preselected depths.

7. The water distribution system according to claim 1, wherein said exterior housing comprises an exterior surface which extends adjacent to and substantially parallel to said main body sections of said antennas.

8. The water distribution system according to claim 7, wherein said main body sections of said antennas contact said exterior surface of said exterior housing.

9. The water distribution system according to claim 1, wherein said short sections of said antennas define first short sections, each of said antennas further include second short sections, which extend from opposite ends of respective ones of said main body sections than said first short sections, and said second short sections extend from said ends of said main body sections into said exterior housing, such that said main body portions are each secured to said exterior housing on said opposites ends by respective ones of said first and second short sections.

10. The water distribution system according to claim 1, wherein said moisture sensor includes a control section which is disposed within said exterior housing of said moisture sensor, and electrically connected directly between said electrically actuated valve and said primary system controller for directly controlling said electrically actuated valve according to the level of moisture detected within the portion of the soil disposed proximate to said moisture sensor.

11. The water distribution system according to claim 10, wherein said control section includes two devices which each have a common leg and a switched leg, wherein said two devices are actuated to electrically connect respective ones of said common legs to said switched legs, and said two devices are electrically connected together and to said two laterally spaced apart antennas and said primary system controller, such that said two devices are actuated and then latched into actuated positions upon a predetermined level of moisture being detected in the portion of the soil disposed proximate to said laterally spaced apart antennas until power is removed therefrom by said primary system controller.

3. A water distribution system for irrigating soil, comprising:

a pipe system having at least one branch for distributing water to the soil;

an electrically actuated valve for controlling a flow of the water through said branch;

a primary system controller for selectively applying electric power to actuate said valve;

a moisture sensor having an exterior housing and two laterally spaced apart antennas which extend from said exterior housing, each of said antennas including a short section and a main body section, wherein said short sections extend from said exterior housing and bend to define said main body sections, said main body sections are spaced apart to extend substantially within a laterally extending, singular horizontal plane, and said short sections extend in relation to said main body sections such that an effective region of investigation of said moisture sensor is defined substantially within the singular horizontal plane;

wherein said moisture sensor is disposed within the soil for determining a level of moisture within a portion of the soil which is proximate to said moisture sensor and disposed within the laterally extending, singular horizontal plane; and

wherein said moisture sensor is electrically connected to at least one of said primary system controller and said valve for selectively closing said valve to prevent the flow of water through said branch in response to said moisture sensor detecting the level of moisture within the portion of the soil proximate to said moisture sensor.

4. The water distribution system according to claim 3, wherein said main body sections of said antennas extend in parallel within the laterally extending, singular horizontal plane.

5. The water distribution system according to claim 4, wherein said pipe system extends proximate to a building foundation, and said moisture sensor is disposed for determining whether a sufficient level of moisture is present within the soil proximate to the building foundation.

6. The water distribution system according to claim 3, further comprising:

said branch including a plurality of piping sections for distributing water to different regions of the soil, the flow of water through a first one of said piping sections being controlled by said electrically actuated valve;

a second electrically actuated valve included within said branch for separately controlling the flow of water through a second piping section of said branch;

said primary system controller being connected to said valves for selectively applying electric power to simultaneously actuate said valves of said branch;

a second moisture sensor disposed within one of the regions being irrigated by the second piping section for determining a respective level of moisture within a second portion of the soil which is proximate to said second moisture sensor; and

said second moisture sensor being electrically connected to at least one of said primary system controller and said second valve for selectively closing said second said valve to prevent the flow of water through said second piping section in response to detecting the respective level of moisture within the second portion of the soil proximate thereto.

12. A water distribution system for irrigating soil, comprising:

a pipe system having at least one branch for distributing water to the soil;

an electrically actuated valve for controlling a flow of the water through said branch;

a primary system controller for selectively applying electric power to actuate said valve;

a moisture sensor having an exterior housing and two laterally spaced apart antennas which extend from said exterior housing, each of said antennas including a short section and a main body section, wherein said short sections extend from said exterior housing and bend to define said main body sections, said main body sections are spaced apart to extend substantially within a laterally extending, singular plane, and said short sections extend in relation to said main body sections such that an effective region of investigation of said moisture sensor is defined substantially within the singular plane;

said moisture sensor further having a control section which is disposed within said exterior housing, and electrically connected directly between said electrically actuated valve and said primary system controller for directly controlling said electrically actuated valve according to the level of moisture detected within the portion of the soil disposed proximate to said moisture sensor;

wherein said moisture sensor is disposed within the soil for determining a level of moisture within a portion of the soil which is proximate to said moisture sensor and disposed within the laterally extending, singular plane; and

wherein said moisture sensor is electrically connected to at least one of said primary system controller and said valve for selectively closing said valve to prevent the flow of water through said branch in response to said moisture sensor detecting the level of moisture within the portion of the soil proximate to said moisture sensor.

13. The water distribution system according to claim 12, wherein said main body sections of said antennas extend in parallel within the laterally extending, singular plane.

14. The water distribution system according to claim 12 wherein said pipe system extends proximate to a building foundation, and said moisture sensor is disposed for determining whether a sufficient level of moisture is present within the soil proximate to the building foundation.

15. The water distribution system according to claim 12, further comprising:

said branch including a plurality of piping sections for distributing water to different regions of the soil, the flow of water through a first one of said piping sections being controlled by said electrically actuated valve;

a second electrically actuated valve included within said branch for separately controlling the flow of water through a second piping section of said branch;

said primary system controller being connected to said valves for selectively applying electric power to simultaneously actuate said valves of said branch;

a second moisture sensor disposed within one of the regions being irrigated by the second piping section for determining a respective level of moisture within a second portion of the soil which is proximate to said second moisture sensor; and

said second moisture sensor being electrically connected to at least one of said primary system controller and said second valve for selectively closing said second said valve to prevent the flow of water through said second piping section in response to detecting the respective level of moisture within the second portion of the soil proximate thereto.

16. The water distribution system according to claim 12, wherein said exterior housing comprises an exterior surface which extends adjacent to and substantially parallel to said main body sections of said antennas.

17. The water distribution system according to claim 16, wherein said main body sections of said antennas contact said exterior surface of said exterior housing.

18. The water distribution system according to claim 17, wherein said short sections of said antennas define first short sections, each of said antennas further include second short sections, which extend from opposite ends of respective ones of said main body sections than said first short sections, and said second short sections extend from said ends of said main body sections into said exterior housing, such that said main body portions are each secured to said exterior housing on said opposites ends by respective ones of said first and second short sections.

19. The water distribution system according to claim 12, wherein said control section includes two devices which each have a common leg and a switched leg, wherein said two devices are actuated to electrically connect respective ones of said common legs to said switched legs, and said two devices are electrically connected together and to said two laterally spaced apart antennas and said primary system controller, such that said two devices are actuated and then latched into actuated positions upon a predetermined level of moisture being detected in the portion of the soil disposed proximate to said laterally spaced apart antennas until power is removed therefrom by said primary system controller.