Patents by Inventor Pierre-Alain Chollet

Pierre-Alain Chollet 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).

  • Improved electro-optical crystal
    Patent number: 5157324
    Abstract: A Pockels effect electric field sensor includes, as a sensitive element, a crystal with electro-optic properties traversed by a luminous beam with specific polarization and propagation directions. The crystal is cut into the shape of an ellipsoid (14) and has a crystallographic symmetry being either uniaxial 622, 422 or 42m or cubic 43m or 23, the three perpendicular axes of the ellipsoid being orientated along three trirectangular crystallographic axes with the highest symmetry of the crystal.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: October 20, 1992
    Assignee: Commissariat a l'Energie Atomique
    Inventor: Pierre-Alain Chollet
  • Device for measuring an electrical field by an optical method
    Patent number: 4774406
    Abstract: A device for measuring electric fields mainly comprises a laser and a probe provided with a centrosymmetric polymer sheet permitting the generation, under the action of the field, of the second harmonic of the emitted wavelength. Optical fibers carry the incident and reflected waves of the laser to the probe and then to an optical measuring cascade. This device is of particular interest for measuring the electric fields between high voltage coaxial cables.
    Type: Grant
    Filed: May 22, 1987
    Date of Patent: September 27, 1988
    Assignee: Commisariat a l'Energie Atomique
    Inventors: Pierre-Alain Chollet, Francois Kajzar, Jean Messier