Method of inspecting abnormality occurring inside pipe and apparatus for practicing the method
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United States of America Patent
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-
Jun 30, 1998
Issued Date -
N/A
app pub date -
Jan 12, 1996
filing date -
Jun 15, 1993
priority date (Note) -
Expired
status (Latency Note)
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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.
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