What type of magnetization does the FI-QI coil counteract?

The FI-QI coil, also known as a Field Indicator – Quasi-Induced coil, is specifically designed to counteract longitudinal induced magnetization. Longitudinal magnetization occurs when an external magnetic field aligns the magnetic domains in a long axis, creating a lasting magnetic effect that may interfere with the desired magnetic patterns or measurements in an area under inspection.

The FI-QI coil generates an opposing magnetic field, effectively neutralizing this longitudinal effect. This neutralization is vital in applications such as non-destructive testing, where accurate readings are essential. By counteracting longitudinal induced magnetization, the FI-QI coil helps ensure that any minor defects or irregularities in a material can be detected without the influence of lingering magnetic fields that might distort the measurements being taken.

Understanding this concept is critical for applications involving electromagnetic fields, where the accurate detection of anomalies depends on the effective mitigation of undesired magnetic influences.