Near Field Testing
The near field testing (NFT) eddy current technology is a rapid and inexpensive inspection solution designed specifically for ID defect detection in carbon steel fin-fan tubes. NFT probes reduce cost and improve ease of use because they do not require expensive and cumbersome externally referenced coils.
Near field probes are an excellent alternative to magnetic flux leakage (MFL) probes. This new technology, which is based on a simple eddy current exciter/pickup design, produces signals that are very easy to analyze. Unlike MFL, these probes don not have a permanent magnet, making the probe pulling easier.