Detection and ranging of material flaws using microwave transmis

Details Detection and ranging of material flaws using microwave transmis Detection and ranging of material flaws using microwave transmis

1991-07-31

1993-02-09

Harvey, Jack B.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324533, 324637, 333238, G01R 3111

Patent

active

051855798

ABSTRACT:
A structure integrity monitoring apparatus and method for use with certain structures such as air-frame structures. A meandering transmission line (22) or serpentine coaxial cable is adhered to a dielectric substrate (20). The dielectric substrate may be a composite panel of the air-frame structure. A microwave signal is introduced at one end of the transmission line (22) or coaxial cable and absorbed at the other end by an appropriate signal absorbing device. For use of the meandering transmission line (22), generally two conductors (22, 24) are affixed on opposite sides of the dielectric substrate (20). In this manner, an electric field created by the two conductors (22, 24) by the microwave signals propagating through them is confined within the dielectric substrate (20). As the signals travel down the transmission conductors (22, 24), they will be reflected at crossover points along the way creating a signature reflection wave. If the dielectric substrate is flawed, a perturbation in the electric field caused by the flaw will create a reflection of the microwave signal at the flaw area. When this reflection signal is compared with the signature signal, it can be determined where and if a flaw is present.

REFERENCES:
patent: 3753086 (1973-08-01), Shoemaker, Jr.
patent: 4123703 (1978-10-01), Robinson
patent: 4739276 (1988-04-01), Graube
patent: 4743887 (1988-05-01), Pothier
patent: 4949076 (1990-08-01), Wann
patent: 5034708 (1991-07-01), Adamian et al.

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