Karl L Hansen

US Patent:

42713935, Jun 2, 1981

Filed:

Dec 29, 1978

Appl. No.:

5/974356

Inventors:

Karl A. Hansen - Seattle WA
Iver G. Hendrickson - Seattle WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

G01R 3312

US Classification:

324240

Abstract:

Nondestructive evaluation of conductive materials is disclosed wherein a magnetic field having a relatively slow rise time and a relatively fast fall time induces eddy currents in the conductive material being tested and subsurface flaws such as internal cracks or other discontinuities are detected by monitoring the magnetic field produced by the eddy currents. The magnetic field is generated by sequentially discharging two capacitor banks through a coil with the currents supplied by the capacitor banks being of opposite polarity and the first capacitive discharge exhibiting a time constant that is substantially longer than the second capacitive discharge. The initial, slowly rising portion of the magnetic field establishes magnetic flux that extends to substantial depths within the conductive material and the fast fall time of the magnetic field causes eddy currents of substantial magnitude to circulate within the region of the conductive material being examined. Flaws within the material cause perturbations in the eddy currents and induce current variations in a pickup coil during a time interval occurring shortly after the magnetic field begins to collapse. Detection equipment, connected for receiving the signal supplied by the pickup coil, monitors the amplitude of the pickup coil signal and, in some situations, its relationship in time relative to the rapid collapse of the magnetic field to determine the presence and location of a flaw.

US Patent:

43832180, May 10, 1983

Filed:

Sep 30, 1980

Appl. No.:

6/192251

Inventors:

Karl A. Hansen - Seattle WA
Iver G. Hendrickson - Seattle WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

G01N 2790
G01R 3312

US Classification:

324225

Abstract:

Disclosed is an eddy current inspection system for nondestructive detection of subsurface flaws in regions of multilayer conductive structure that surround a fastener which joins the conductive layers. The eddy currents are induced by an aperiodic drive current having a relatively long rise time and a relatively last fall time that is supplied to a drive coil and a pick-up coil that is mounted with the drive coil supplies a signal representative of the induced eddy currents. Compensation is provided for variation in lift-off (spacing between the surface of the structure being inspected and the surface of the drive coil and pick-up) by utilizing parametric relationships relative to the maximum amplitude of inspection signals supplied when subsurface flaws exist and inspection signals supplied when lift-off is present. Because similar parametric relationships exist relative to other system characteristics that affect the electromagnetic environment of the inspection media, compensation can also be provided for variation in the height of fasteners (protrusion), fastener edge margin, and gaps or spacing between the successive conductive layers of the multilayer structure. By utilizing a microprocessor or other sequential digital signal processing apparatus, values that define the parametric relationships utilized in compensating for any particular system characteristic can be stored in memory for the inspection of a relatively large number of structural configurations.

US Patent:

41353790, Jan 23, 1979

Filed:

Sep 27, 1976

Appl. No.:

5/726872

Inventors:

Karl A. Hansen - Seattle WA
I. Glen Hendrickson - Seattle WA

Assignee:

Boeing Commercial Airplane Company - Seattle WA

International Classification:

B21D 2602

US Classification:

72 56

Abstract:

An adjustable regulator and a cycle initiating firing pin are mounted in the handle of a casing which contains a flux concentrator. The adjustable regulator sets the amplitude of current from a control panel to the flux concentrator through a flexible multi-conductor cable. The flux concentrator is separately encased and detachably mounted to the casing.

US Patent:

52317471, Aug 3, 1993

Filed:

Dec 21, 1990

Appl. No.:

7/632445

Inventors:

Gregory L. Clark - Issaquah WA
Gregory C. Givler - Renton WA
Karl A. Hansen - Seattle WA
John R. Hare - Federal Way WA
Edward J. Woods - Port Orchard WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

B23P 1100
B23P 1904

US Classification:

2924353

Abstract:

This invention relates to a machine and its constituent components for drilling a hole in a workpiece, inserting a rivet in the hole, and upsetting the rivet, all without moving the lateral position of the machine or the workpiece, and to an assembly for supporting and positioning a plurality of said machines for working simultaneously on the workpiece.

US Patent:

RE367877, Jul 25, 2000

Filed:

Jan 18, 1996

Appl. No.:

8/588365

Inventors:

Karl A. Hansen - Seattle WA
C. David Lunden - Federal Way WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

H05B 636

US Classification:

219632

Abstract:

There is disclosed a high power induction heating coil for use in thermoplastic welding where a metallic susceptor is embedded in a composite assembly and is heated by eddy currents generated by the coil. The coil is comprised of several windings of Litz wire composed of multiple individually insulated strands of copper wire. The coil is wound on a circular E core having a coolant conduit through the center of the core. Coolant is introduced through the central core and returned by circulating through the loosely wound coil to the coolant source.

US Patent:

55084966, Apr 16, 1996

Filed:

Sep 28, 1994

Appl. No.:

8/314027

Inventors:

Karl A. Hansen - Seattle WA
Edward C. Weisberg - Renton WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

H05B 610

US Classification:

219633

Abstract:

Susceptors for induction heating for use in thermoplastic welding are tailored to provide precise control of the heat applied to the weld and especially to control overheating at the edges of susceptor. The preferred susceptor has a central portion having a uniform pattern of substantially similar openings and selvage edge strips devoid of openings to provide a low impedance current path for eddy currents at the edges. We can create aerospace structure, particularly a wingskin-spar assembly, without fasteners.

US Patent:

D2468247, Jan 3, 1978

Filed:

Sep 27, 1976

Appl. No.:

5/726871

Inventors:

Karl A. Hansen - Seattle WA
I. Glen Hendrickson - Seattle WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

D0805

US Classification:

D 8 67

US Patent:

41480910, Apr 3, 1979

Filed:

Dec 27, 1977

Appl. No.:

5/864735

Inventors:

Karl A. Hansen - Seattle WA
Iver G. Hendrickson - Seattle WA

Assignee:

The Boeing Company - Seattle WA

International Classification:

H02M 540

US Classification:

361156

Abstract:

An electromagnetic force (EMF) machine with a universal portable power supply is disclosed. The universal portable power supply energizes either a multiple turn flux concentrator or a single turn flux concentrator. The flux concentrators produce magnetic fields that create an outward tension force adapted to perform non-destructive bond tests (tension proof loading) and/or dent removal operations on panels or the like. The power supply includes a slow current pulse subsystem; a fast current pulse subsystem; slow and fast crowbars; and, a firing control. The firing control controls the production of pulses by the slow and a fast current pulse subsystems, and, the operation of the slow and fast crowbars. The slow pulse subsystem, via the flux concentrator, slowly creates a magnetic field that penetrates the panel; the fast pulse subsystem, via the flux concentrator, rapidly decreases the magnetic field, whereby a negative field gradient is produced across the panel. The negative field gradient exerts the outward tension force on the panel.