APPARATUS AND METHOD FOR DETECTING DEFECT WITH MAGNETIC FLUX INDUCTED BY AC MAGNETIC FIELD

摘要

The induction flux flaw detector according to the present invention is a kind of non-destructive inspection device for inspecting defects inside and outside a facility composed of a nonmagnetic material such as a heat pipe material of a steam generator in a nuclear power plant.;Magnetization yoke 2 which is not in contact with the subject, a coil part 6 wound around the magnetization yoke to form an alternating magnetic field in the magnetization yoke, and a power supply device 10 for supplying AC power at an appropriate frequency to the coil part. AC magnetic field applying device including; The magnetic sensor 3 which detects the magnetic flux induced along the test specimen by the alternating magnetic field generated by the magnetization yoke and generates a measurement signal, and the amplification circuit 11 which amplifies and filters the measurement signal generated by the magnetic sensor. And a probe comprising a signal processing unit 12 for processing the amplified and filtered measurement signal to calculate the position and size of the defect in the subject; It consists of the test subject 1 in which the defect 4 exists inside or outside.;AC magnetic field, magnetic induction, induction flux, defect, eddy current inspection, heat pipe