Patents by Inventor Carvel E. Holton

Carvel E. Holton has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6621561
    Abstract: The disclosed invention concept utilizes a homodyne/heterodyne interferometer technique in a modified lidar in such a manner as to sense the rotational velocity magnitude and sense of a rotating (or “spinning”) object. Sensing is accomplished in assessing either the Doppler bandwidth of a single axis system or in sensing the frequency separation of Doppler spectrums in a “two” axis system. The technique is unique in that the Doppler bandwidth is linearly proportional to rotational velocity and independent of intercept position in the rotation plane. The technique as disclosed is based on optical fiber lidar techniques, but can be implemented in free-space optics as well. The disclosed invention therefore comprises both a technique for utilization of an optical fiber lidar and a new arrangement of lidar elements. Compact and cost effective, standoff rotation velocity sensors and systems can be fabricated with this technique.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: September 16, 2003
    Assignee: Virginia Tech Intellectual Properties
    Inventor: Carvel E. Holton
  • Patent number: 6608669
    Abstract: A method of generating in-quadrature signals is disclosed. The method comprises phase shifting a Doppler frequency-shifted signal; phase shifting a local oscillator signal; mixing the phase shifted Doppler frequency-shifted signal and the phase-shifted local oscillator signal generating thereby a signal which includes the phase-shifted Doppler frequency-shifted signal and a further phase-shifted local oscillator signal; and mixing the unphase-shifted Doppler frequency-shifted signal and the unphase-shifted local oscillator signal generating thereby a signal which includes the unphase-shifted local oscillator signal and a further phase-shifted Doppler frequency-shifted signal. A method of determining the velocity of an object is also disclosed.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: August 19, 2003
    Assignee: Virginia Tech Intellectual Properties
    Inventor: Carvel E. Holton
  • Patent number: 6534977
    Abstract: Described are the design of a rare earth iron garnet sensor element, optical methods of interrogating the sensor element, methods of coupling the optical sensor element to a waveguide, and an optical and electrical processing system for monitoring the polarization rotation of a linearly polarized wavefront undergoing external modulation due to magnetic field or electrical current fluctuation. The sensor element uses the Faraday effect, an intrinsic property of certain rare-earth iron garnet materials, to rotate the polarization state of light in the presence of a magnetic field. The sensor element may be coated with a thin-film mirror to effectively double the optical path length, providing twice the sensitivity for a given field strength or temperature change. A semiconductor sensor system using a rare earth iron garnet sensor element is described.
    Type: Grant
    Filed: October 21, 1999
    Date of Patent: March 18, 2003
    Inventors: Paul Duncan, Carvel E. Holton, Richard O. Claus
  • Publication number: 20020105632
    Abstract: A method of generating in-quadrature signals is disclosed. The method comprises phase shifting a Doppler frequency-shifted signal; phase shifting a local oscillator signal; mixing the phase shifted Doppler frequency-shifted signal and the phase-shifted local oscillator signal generating thereby a signal which includes the phase-shifted Doppler frequency-shifted signal and a further phase-shifted local oscillator signal; and mixing the unphase-shifted Doppler frequency-shifted signal and the unphase-shifted local oscillator signal generating thereby a signal which includes the unphase-shifted local oscillator signal and a further phase-shifted Doppler frequency-shifted signal. A method of determining the velocity of an object is also disclosed.
    Type: Application
    Filed: September 20, 2001
    Publication date: August 8, 2002
    Inventor: Carvel E. Holton
  • Publication number: 20020075475
    Abstract: The disclosed invention concept utilizes a homodyne/heterodyne interferometer technique in a modified lidar in such a manner as to sense the rotational velocity magnitude and sense of a rotating (or “spinning”) object. Sensing is accomplished in assessing either the Doppler bandwidth of a single axis system or in sensing the frequency separation of Doppler spectrums in a “two” axis system. The technique is unique in that the Doppler bandwidth is linearly proportional to rotational velocity and independent of intercept position in the rotation plane. The technique as disclosed is based on optical fiber lidar techniques, but can be implemented in free-space optics as well. The disclosed invention therefore comprises both a technique for utilization of an optical fiber lidar and a new arrangement of lidar elements. Compact and cost effective, standoff rotation velocity sensors and systems can be fabricated with this technique.
    Type: Application
    Filed: September 20, 2001
    Publication date: June 20, 2002
    Inventor: Carvel E. Holton
  • Publication number: 20020075472
    Abstract: An optical fiber based ceilometer for sensing cloud height is disclosed. In a first embodiment, the ceilometer comprises a transmitter based upon optical fibers transmitting an output signal to a target. The transmitter includes a radiation source generating the output signal at a prescribed wavelength or wavelengths. A first waveguide is receptive of the output signal and guides the output signal therealong. A receiver is receptive of a return signal wherein the return signal comprises the output signal reflected or backscattered from the target. In a second embodiment the ceilometer comprises a radiation source generating an output signal at a prescribed wavelength. An optical fiber transceiver is receptive of the output signal and transmits the output signal to a target, receiving thereby a return signal; wherein the return signal comprises the output signal reflected or backscattered off of the target. A sensor senses the return signal.
    Type: Application
    Filed: September 20, 2001
    Publication date: June 20, 2002
    Inventor: Carvel E. Holton
  • Patent number: 5825448
    Abstract: A reflective liquid crystalline diffractive light valve for use in a diffractive projection system. The liquid crystal cell includes a transparent substrate and a reflective substrate treated to provide alternating stripes which cooperate with the liquid crystal to form liquid crystal domains extending across the thickness of the cell that will produce an appropriate phase difference in light reflected by the cell, irrespective of the polarization of incident light. The techniques embodied in the present invention are applicable to the creation of electrically controllable diffractive optical elements for ray optic, integrated optic or fiber optic utilization operated in either transmission or reflection. Diffractive patterns may be lithographically, holographically or interferometrically generated.
    Type: Grant
    Filed: November 5, 1996
    Date of Patent: October 20, 1998
    Assignee: Kent State University
    Inventors: Philip J. Bos, Jianmin Chen, David L. Johnson, deceased, William E. Glenn, Carvel E. Holton, Brett E. Smith
  • Patent number: 5638201
    Abstract: A liquid crystalline diffractive light valve for use in a diffractive projection system. The liquid crystal cell includes substrates treated to provide alternating stripes which cooperate with the liquid crystal to form liquid crystal domains extending across the thickness of the cell that will produce a 180.degree. phase difference in light emerging from adjacent domains, irrespective of the polarization of incident light.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: June 10, 1997
    Inventors: Philip J. Bos, David L. Johnson, Jianmin Chen, Hemasiri K. Vithana, William E. Glenn, Carvel E. Holton, Brett E. Smith