Patents Assigned to Industrial Quality, Inc.
  • Patent number: 5895791
    Abstract: In a method for obtaining near-surface characteristics of a material, a series of single frequency ultrasonic Rayleigh waves are generated, with a generating system, in the material. The Rayleigh waves are detected with a detection system remote from the generating system. Velocities of the detected Rayleigh waves are determined at the selected frequencies. A depth profile of one or more characteristics of the material is prepared based on the determined Rayleigh wave velocities.
    Type: Grant
    Filed: January 6, 1998
    Date of Patent: April 20, 1999
    Assignee: Industrial Quality, Inc.
    Inventors: Eric A. Lindgren, Moshe Rosen, Harold Berger
  • Patent number: 5894092
    Abstract: In a method for obtaining near-surface characteristics of a material, a series of single frequency ultrasonic Rayleigh waves are generated, with a generating system, in the material. The Rayleigh waves are detected with a detection system remote from the generating system. Velocities of the detected Rayleigh waves are determined at the selected frequencies. A depth profile of one or more characteristics of the material is prepared based on the determined Rayleigh wave velocities.
    Type: Grant
    Filed: January 6, 1998
    Date of Patent: April 13, 1999
    Assignee: Industrial Quality, Inc.
    Inventors: Eric A. Lindgren, Moshe Rosen, Harold Berger
  • Patent number: 5767408
    Abstract: In a method for obtaining near-surface characteristics of a material, a broadband ultrasonic Rayleigh wave including a plurality of components is generated, with a generating system, in the material. The Rayleigh wave is detected with a detection system remote from the generating station. The detected Rayleigh wave is filtered to obtain selected ones of the plurality of components of the detected Rayleigh wave at selected frequencies. Velocities of the selected components of the detected Rayleigh wave are determined at the selected frequencies. A system for obtaining near-surface characteristics of a material is also disclosed.
    Type: Grant
    Filed: September 27, 1996
    Date of Patent: June 16, 1998
    Assignee: Industrial Quality, Inc.
    Inventors: Eric A. Lindgren, Moshe Rosen, Harold Berger
  • Patent number: 5229832
    Abstract: A dual-interferometer apparatus for simultaneously measuring in-plane and out-of-plane ultrasonic displacements of the surface of materials comprising a single laser source, optical fibers, optical couplers and dividers, a phase-conjugate mirror, and a path length stabilizing system including a piezoelectric compensator. The present invention is unique in providing for the automatic alignment of the beams of the two interferometers, thus eliminating the need for time-consuming alignment procedures. The automatic alignment of the interferometers is achieved because a phase conjugate mirror is used to generate a counterpropagating beam used by both interferometers, and because the beams for the out-of-plane interferometer are derived from the beams used for the in-plane interferometer.
    Type: Grant
    Filed: July 8, 1991
    Date of Patent: July 20, 1993
    Assignee: Industrial Quality, Inc.
    Inventor: Edwin S. Gaynor
  • Patent number: 5033304
    Abstract: There is provided a nondestructive inspection method and apparatus for determining fiber characteristics such as elasticity, diameter, and chemical composition, and the thickness and quality of fiber coatings via laser-generated ultrasound for velocity and attenuation measurements.
    Type: Grant
    Filed: April 27, 1989
    Date of Patent: July 23, 1991
    Assignee: Industrial Quality, Inc.
    Inventor: Moshe Rosen