Patents Represented by Attorney David H. Parker
  • Patent number: 8209134
    Abstract: Methods are disclosed wherein the structural health of a civil structure, such as, but not limited to, a bridge or the like is measured by electronic distance measurement (EDM) from a plurality of stable locations to a plurality of cardinal points on the structure in a methodical manner. By measuring the coordinates of the cardinal points, the dynamic and long-term static behavior of the structure provide an indication of the health of the structure. Analysis includes: comparison to a Finite Element Model (FEM); comparison to historical data; and modeling based on linearity, hysteresis, symmetry, creep, damping coefficient, and harmonic analysis.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: June 26, 2012
    Assignees: Sophie Lin
    Inventors: David H. Parker, John M. Payne, Sophie Lin, legal representative
  • Patent number: 8116994
    Abstract: A non-invasive method for easily locating an underground septic tank, distribution box, field line, conduit, or underground cavity is disclosed. In a preferred embodiment, prescribed acoustic signals are injected into an underground cavity via an accessible port and remotely detected by a time synchronized detector in contact with the ground which cross correlates the detected signal with a duplicate of the prescribed acoustic signal in order to reject background noise, and thus locate the underground cavity. A frequency sweep is conducted to exploit cavity resonance modes and thus further enhance the signal to noise ratio.
    Type: Grant
    Filed: November 23, 2008
    Date of Patent: February 14, 2012
    Inventor: David H. Parker
  • Patent number: 7895015
    Abstract: Methods are disclosed wherein the structural health of a civil structure, such as, but not limited to, a bridge or the like is measured by electronic distance measurement from a plurality of stable locations to a plurality of cardinal points on the structure in a methodical manner. By measuring the coordinates of the cardinal points, the dynamic and long-term static behavior of the structure provide an indication of the health of the structure. Analysis includes; comparison to a Finite Element Model (FEM), comparison to historical data, linearity, hysteresis, symmetry, creep, damping coefficient, and harmonic terms.
    Type: Grant
    Filed: December 4, 2008
    Date of Patent: February 22, 2011
    Inventors: David H. Parker, John M. Payne
  • Patent number: 7856334
    Abstract: A method is disclosed whereby a laser-based spherical coordinate measurement system is dynamically calibrated. A mechanical oscillator, such as, but not limited to, a Foucault pendulum is used to generate periodic motions which can be fitted to Fourier series models. The residuals between the experimental measurements and the model can provide information which can be used to calibrate the instrument. The calibration information is used to augment the ASME B89.4.19-2006 standard to improve sensitivity to cyclic errors and include the servo systems.
    Type: Grant
    Filed: December 6, 2008
    Date of Patent: December 21, 2010
    Inventor: David H. Parker