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Abstract

An alignment direction detection device includes an excitation coil to apply an AC magnetic field to a test object; one or more magnetic field sensors, each of which detects an inductive magnetic field caused by the AC magnetic field; a conveyance device; and processing circuitry. The processing circuitry performs band limitation on a distribution of the voltage outputted from each magnetic field sensor included in the one or more magnetic field sensors based on a radial direction space frequency corresponding to a size of the magnetic field sensor and a distance between the magnetic field sensor and the test object, transforms the band-limited voltage distribution into an output intensity waveform with respect to a space angle at the radial direction space frequency, and calculates a peak angle that is a peak position of the waveform as an alignment angle representing the alignment direction.

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