Method of inspecting abnormality occurring inside pipe and appar

Details Method of inspecting abnormality occurring inside pipe and appar Method of inspecting abnormality occurring inside pipe and appar

1996-01-12

1998-06-30

Oda, Christine K.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

G01R 2900

Patent

active

057739846

ABSTRACT:
A method of inspecting an abnormality occurring inside a pipe to be inspected, and an apparatus for practicing the method, which includes the steps of transmitting an electric radio or radio frequency (RF) wave having a predetermined frequency from an antenna of a transmitter located at a predetermined position inside the pipe, receiving the transmitted RF wave by an antenna of a receiver located at a predetermined position inside the pipe, and discriminating a characteristic of the received RF wave. The characteristic of the received RF wave can be the intensity of the RF wave, and an attenuation amount is detected in a first example. Alternatively, the characteristic of the received RF wave may be the time required to reflect the transmitted RF wave and receive it with the receiver, and the time interval between transmission of the RF wave and reception of the reflected RF wave is measured in this alternative.

REFERENCES:
patent: 2537737 (1951-01-01), Chamberlin
patent: 3753086 (1973-08-01), Shoemaker, Jr.
patent: 3990003 (1976-11-01), Agee
patent: 4573016 (1986-02-01), Nakamura et al.
patent: 4677438 (1987-06-01), Michiguchi et al.
patent: 5019822 (1991-05-01), Kirkland
patent: 5151657 (1992-09-01), Tashjian
patent: 5194812 (1993-03-01), Yokoi
patent: 5233297 (1993-08-01), Lara
patent: 5373443 (1994-12-01), Lee et al.
patent: 5408182 (1995-04-01), Stolarczyk et al.
Patent Abstracts of Japan, vol. 16, No. 562 (P-1456) Dec. 3, 1991 & JP-A-04 215 046 (Nippon Steel Corp.) Aug. 5, 1992, Abstract.
Patent Abstracts of Japan, vol. 13, No. 508 (P-960) Nov. 15, 1989 & JP-A-01 206 246 (Osaka Gas Co. Ltd.) Abstract.
H. Mintrop, et al., "Die Anwendung von Mikrowellen zur Prufung der Innengeometrie von schlanken Stahlrohren", in: Messen und Prufen/Automatik, No. 10, Oct. 1973, pp. 635-637.
J.C. Gallop, et al., "Dimensional measurement by microwave resonances", in: E. Sci. Instrum. vol. 14, (1981), pp. 461-463.
J.C. Gallop, et al., "Shape and dimensional measurement using microwaves", in: J. Phys. E: Sci. Instrum. 19 (1986), pp. 413-417.

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