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Remote Field Testing for ferromagnetic materials
RFT is sometimes called a through-transmission ET technique. It requires a special RFT probe in which the exciter coil is separated from the pickup coil by a distance of two-to-three times the tube diameter. The receiving coil detects the flux energy that moves through the tube wall. RFT tests can detect flaws on the inside diameter and the outside diameter of the tube. The highly magnetic properties of ferrous materials require higher power AC fields to generate meaningful RFT test signals. An RFT amplifier, configured with the test instrument, provides the necessary output levels. The RFT probes are specifically designed to handle these increased power requirements.
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