Patents Assigned to Lincoln College
  • Dielectric constant monitor
    Patent number: 5148125
    Abstract: Monitoring of the average dielectric constant in an extended volume of a medium such as soil is achieved using an oscillator incorporating a transmission line to be embedded in the medium. The transmission line is connected as the feedback loop of an amplifier, for one-way propagation of an electrical signal with a delay determined largely by the dielectric properties of the medium, such as its moisture content. The oscillation frequency is indicative of the dielectric constant of the medium.
    Type: Grant
    Filed: June 21, 1991
    Date of Patent: September 15, 1992
    Assignee: Lincoln College
    Inventors: Ian M. Woodhead, Stephen J. J. Hirsch