1
Paul J Latimer, Daniel T MacLauchlan: EMAT probe and technique for weld inspection. Daniel S Kalka, Robert J Edwards, June 2, 1998: US05760307 (208 worldwide citation)

A method and apparatus of inspecting for flaws in a specular reflector, where the flaws having an expected length and the reflector is electrically conductive. The method includes directing a beam of an electromagnetic acoustic transmitting transducer along a beam axis toward the specular reflector ...


2
Donald M Stevens, Daniel T MacLauchlan, Paul J Berbakov: Edge detection and seam tracking with EMATs. McDermott Technology, R J Edwards, Eric Marich, R C Baraona, December 5, 2000: US06155117 (208 worldwide citation)

A method for detecting the location of an edge, interface, seam or other structure of a workpiece uses one or two electromagnetic acoustic transducers (EMATs) to transmit an ultrasonic wave along the workpiece toward the edge and to receive a reflected wave. The velocity of the wave in the material ...


3
Jimmy W Hancock, Daniel T MacLauchlan: Electromagnetic acoustic transducer (EMAT) inspection of tubes for surface defects. McDermott Technology, R J Edwards, Eric Marich, R C Baraona, December 26, 2000: US06164137 (29 worldwide citation)

An EMAT testing device for nondestructively testing tubes for surface defects and displaying the results has a EMAT transmitter arranged collinear with a pair of EMAT receivers. The EMAT receivers each receive a pair of oppositely propagating circumferential acoustic surface waves from the transmitt ...


4
Paul J Latimer, Daniel T Maclauchlan: Detection of corrosion fatigue cracks in membrane boiler tubes. The Babcock & Wilcox Company, Daniel S Kalka, Robert J Edwards, June 18, 1996: US05526691 (27 worldwide citation)

A method for detecting corrosion fatigue cracks in membraned boiler tubes in a membrane tube panel employs at least one EMAT coil generating ultrasonic SH shear waves at a predetermined beam angle. The method of the present invention provides better signal-to-noise ratios than conventional ultrasoni ...


5
George A Alers, Leigh R Burns Jr, Daniel T MacLauchlan: Electromagnetic acoustic transducer. Magnasonics, Gregory O Garmong, October 18, 1988: US04777824 (26 worldwide citation)

A noncontact ultrasonic transducer for studying the acoustic properties of a metal workpiece includes a generally planar magnetizing coil positioned above the surface of the workpiece, and a generally planar eddy current coil between the magnetizing coil and the workpiece. When a large current is pa ...


6
Daniel T MacLauchlan: Electromagnetic acoustic transducer (EMAT) for ultrasonic inspection of liquids in containers. The Babcock & Wilcox Company, Robert J Edwards, Eric Marich, March 4, 1997: US05608164 (23 worldwide citation)

An ultrasonic inspection technique using a specially designed electromagnetic acoustic transducer (EMAT) launches and receives longitudinal ultrasonic waves into a thin metal wall or thin metal foil seal of a container, causing it to vibrate and launch ultrasonic compressional waves into liquid cont ...


7
Jimmy W Hancock, Daniel T MacLauchlan, Ralph D Murphy: Electromagnetic acoustic transducer (EMAT) inspection of cracks in boiler tubes. The Babcock & Wilcox Co, McDermott Technology, Robert J Edwards, Eric Marich, September 4, 2001: US06282964 (20 worldwide citation)

An EMAT device for non-destructive inspection of the surface of a tube for cracks using acoustic surface waves includes a pulsed magnet having an active surface for facing the surface of a tube to be inspected. A receive emat coil is on the active surface and a transmit emat coil is on the opposite ...


8
Daniel T MacLauchlan, Wayne M Latham: EMATS for spot weld examination. McDermott Technology, R J Edwards, R C Baraona, June 26, 2001: US06250163 (17 worldwide citation)

An EMAT apparatus which non-destructively tests spot welds between two sheets of metal. The apparatus includes a first EMAT coil on one sheet that acts as a transmitter for generating and transmitting an acoustic wave signal toward the spot weld, and a second EMAT coil on the other sheet for receivi ...


9
Daniel T MacLauchlan: Method for determining liquid level in a container using an electromagnetic acoustic transducer (EMAT). BWX Technologies, R J Edwards, Eric Marich, R C Baraona, January 23, 2001: US06176132 (15 worldwide citation)

An ultrasonic method for determining liquid level in a container employs an electromagnetic acoustic transducer (EMAT) to launch and receive longitudinal ultrasonic waves into a thin metal wall or thin metal foil seal of the container, causing it to vibrate and launch ultrasonic compressional waves ...


10
Daniel T MacLauchlan, Wayne M Latham, Steven P Clark: Fastener characterization with an electromagnetic acoustic transducer. The Babcock & Wilcox Company, Daniel S Kalka, Robert J Edwards, October 7, 1997: US05675087 (12 worldwide citation)

A device for measuring a load on a part and for monitoring the integrity of the part such as a bolt, comprises a socket having walls defining an interior space wherein the socket engages the bolt for transmitting a load to the bolt. An electromagnetic acoustic transducer comprising a magnet and a co ...