1
Robert B Thompson: Ultrasonic shear wave transducer. Rockwell International Corporation, H Fredrick Hamann, Craig O Malin, John J Deinken, October 13, 1981: US04295214 (42 worldwide citation)

Disclosed is an electromagnetic acoustic transducer, including an electrical conductor adapted to carry an alternating current in a current plane, the current being conveyed by the conductor in uniformly spaced, parallel, and alternate directions at any instant, and a source of magnetic flux positio ...


2
Paul K Davidson, George A Alers, Robert B Thompson, Leigh R Burns Jr: Apparatus and method for nondestructive evaluation of butt welds. Samuel M Freund, July 23, 1996: US05537876 (37 worldwide citation)

Apparatus and method for nondestructive evaluation of butt welds. The present invention in its broadest form includes an apparatus and method for detecting flaws in butt welds in steel sheets using horizontal shear ultrasonic waves generated on the surface thereof. Observation of reflected waves hav ...


3
George A Alers, Robert B Thompson, Carmine F Vasile: Nondestructive testing utilizing horizontally polarized shear waves. Rockwell International Corporation, H Fredrick Hamann, Craig O Malin, John J Deinken, September 15, 1981: US04289030 (35 worldwide citation)

Disclosed is a nondestructive test device for detecting a flaw proximate to a welded seam in a pipe, including an electromagnetic acoustic transmitting transducer for generating a horizontally polarized shear wave in the wall of the pipe, a high frequency generator operatively connected to the trans ...


4
Robert B Thompson, George A Alers, Marion A Tennison: Ultrasonic inspection of pipelines. Rockwell International Corporation, L Lee Humphries, Craig O Malin, June 6, 1978: US04092868 (32 worldwide citation)

A method and device which are suitable for the in-place inspection of pipelines are provided. A completely self-contained, mobile inspection station is placed inside a pipeline. The station runs through the pipe and transmits Lamb waves within the pipe wall, receives reflected and transmitted portio ...


5
Robert B Thompson: Length mode piezoelectric ultrasonic transducer for inspection of solid objects. The United States of America represented by the Administrator of the National Aeronautics and Space Administration, Carl O McClenny, John R Manning, Marvin F Matthews, October 31, 1978: US04122725 (30 worldwide citation)

The transducer is constructed from individual transducer elements arranged in an array and configured to exhibit a predominant, longitudinal mode transversely to the array. The elements are interconnected through thin flexible sheets. Each element is individually damped, and the transducer as a whol ...


6
Robert B Thompson, George A Alers: Method of measuring stress in a material. Rockwell International Corporation, L Lee Humphries, Craig O Malin, March 28, 1978: US04080836 (30 worldwide citation)

Stress in a material is measured using electromagnetically generated, transverse elastic waves. A correlation is known to exist between the difference in velocity of orthogonally polarized transverse waves in the type material being measured and stress in the material. An electromagnetic transducer ...


7
Robert B Thompson, Christopher M Fortunko: Ultrasonic inspection of a cylindrical object. Rockwell International Corporation, L Lee Humphries, Craig O Malin, John J Deinken, January 22, 1980: US04184374 (24 worldwide citation)

A method and an apparatus are provided for ultrasonically inspecting a cylindrical object. The object is placed between the poles of a magnet to create a circumferential magnetic field in the object. A group of electromagnetic transducers (EMAT's) are placed adjacent the material so that the transdu ...


8
Robert B Thompson, Samuel J Wormley, George A Alers: Means and method for ultrasonic measurement of material properties. Iowa State University Research Foundation, Zarley McKee Thomte Voorhees & Sease, October 13, 1992: US05154081 (23 worldwide citation)

The system for field measurement of texture, stress and related material properties such as formability parameters using ultrasonic velocity measurements through crystalline plate or sheet. Electromagnetic acoustic transducers are utilized to generate, transmit, and receive ultrasonic bursts through ...


9
Carmine F Vasile, Robert B Thompson: Ultrasonic apparatus and method for measuring wall thickness. Rockwell International Corporation, H Fredrick Hamann, Craig O Malin, John J Deinken, December 15, 1981: US04305294 (22 worldwide citation)

Disclosed is a method for determining the thickness of an object, including the steps of generating a higher order mode ultrasonic wave at a first location on the object, varying the frequency of the generated wave, and measuring, at a second location on the object, the minimum frequency at which th ...


10
William E Peterson, Robert B Thompson: Electromagnetic acoustic transducer. Rockwell International Corporation, H Fredrick Hamann, Craig O Malin, John J Deinken, March 6, 1984: US04434663 (20 worldwide citation)

Disclosed is an electromagnetic acoustic transducer for use with electrically conductive objects. The transducer includes an electromagnet for establishing a static magnetic field directed into the object in a first region and directed out of the object in a second region. A meander coil for inducin ...