Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1995-10-18
1997-03-18
Oda, Christine K.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
G01R 2900
Patent
active
056126255
ABSTRACT:
A method of measuring the inner diameter of a pipe includes the steps of continuously transmitting RF waves of a predetermined frequency band from an antenna of a transmitter located inside of the pipe to be inspected, receiving the RF waves with an antenna of a receiver located inside the pipe, the antenna of the receiver being spaced apart from the antenna of the transmitter by a predetermined distance, detecting a frequency at a change point where an intensity of the received RF wave changes greatly, and substituting the frequency at the change point into a formula: d=c/1.706f (wherein d is the inner diameter of the pipe, c is the velocity of light, and f is the frequency at the change point) which shows the relation between the inner diameter of the pipe and the frequency to obtain a minimum inner diameter of the pipe.
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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: J. Phys. 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.
Furusawa Hajime
Hosohara Yasuharu
Kobori Takashi
Suyama Kiichi
Oda Christine K.
Tokyo Gas Co. Ltd.
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