Method of measuring inner diameter of pipe

Details Method of measuring inner diameter of pipe Method of measuring inner diameter of pipe

G - Physics

01

B

G01B 7/12 (2006.01) G01B 15/00 (2006.01) G01N 22/02 (2006.01)

Patent

CA 2121310

A method of measuring the inner diameter of a pipe, includes the steps of continuously transmitting electric waves in a predetermined frequency band from an antenna of a transmitter located inside of the pipe to be inspected, receiving the electric waves by an antenna of a receiver located inside the pipe, the antenna of the reciver 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 electric wave changes greatly, substituting the frequency at the change point into a formula: d=c/1.706f (where d is the inner diameter of the pipe, c is the velocity of light, end f is the frequency of 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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