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Moisture sensor and control system

  • US 5,570,030 A
  • Filed: 04/17/1995
  • Issued: 10/29/1996
  • Est. Priority Date: 05/07/1993
  • Status: Expired due to Term
First Claim
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1. A method of measuring soil moisture, comprising;

  • providing a moisture content sensor having a first and a second rigid and electrically insulating body member, said first and second body members being physically spaced apart to define a sensor length parameter and to define an open space between said first and second body members, a plurality of electrically uninsulated and rigid electrical electrodes, each of said electrodes having a first end and a second end, said first end of each electrode being mechanically fastened to different physically spaced points on said first body member, said electrodes passing between said first and second body members in a manner such that said electrodes do not physically touch, and said second ends of each electrode being mechanically fastened to different physically spaced points on said second body member, said plurality of electrodes thereby forming a unitary physical assembly with said first and second body members having said open space between said first and second body members,connecting current transmitter means to one of said ends of first ones of said electrodes,connecting voltage receiver means to one of said ends of different second ones of said electrodes, said voltage receiver means providing an output indicative of moisture content, andplacing said sensor in soil whose moisture content is to be measured.

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