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1.发明授权
公开(公告)号：US5773984A
公开(公告)日：1998-06-30
申请号：US585979
申请日：1996-01-12
摘要： 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.
摘要翻译： 一种检查在待检查的管道内发生的异常的方法，以及一种用于实施该方法的装置，包括以下步骤：从位于所述检测器的发射机的天线发射具有预定频率的电波或射频（RF）波 在管道内的预定位置，通过位于管道内的预定位置处的接收器的天线接收发送的RF波，并且识别所接收的RF波的特性。 所接收的RF波的特性可以是RF波的强度，并且在第一示例中检测到衰减量。 或者，所接收的RF波的特性可以是反射所发射的RF波并且用接收机接收它所需的时间，并且在该替代方案中测量RF波的发射与反射RF波的接收之间的时间间隔。
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公开(公告)号：US5612625A
公开(公告)日：1997-03-18
申请号：US544898
申请日：1995-10-18
摘要： 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.
摘要翻译： 一种测量管道内径的方法包括以下步骤：从位于被检测管内部的发射器的天线连续地发送预定频带的RF波，接收位于内部的接收器的天线的RF波 所述接收器的天线与所述发射机的天线间隔预定距离，检测在所接收的RF波的强度变化很大的变化点处的频率，并将所述变化点处的频率代入到 公式：d = c / 1.706f（其中d是管的内径，c是光的速度，f是变化点的频率），其示出了管的内径与频率之间的关系 以获得管的最小内径。
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