Rail check device and rail check system

A rail check system for generating check data for a defect of a rail for vehicles, the rail check system comprising:

• a first oscillation coil and a second oscillation coil which are disposed to face opposite a top portion of the rail, that is a checked object, with center coil axes of the first and second oscillation coils being perpendicular to the top portion of the rail and aligned in a rail longitudinal direction, and configured to generate magnetic fields whose directions are opposite to each other;
• a receiving coil which is disposed between the first oscillation coil and the second oscillation coil and configured to output a magnetic field waveform as the check data based on magnetic field lines leaking from the first oscillation coil and the second oscillation coil and passing through the rail;
• and
• a rail evaluation device configured to perform a rail check process to determine a defective point of the rail at which there is the defect based on the check data received from the rail check device,
• wherein the rail evaluation device is configured to obtain a first waveform of a cosine component of the magnetic field waveform as the check data outputted from the receiving coil based on the magnetic field lines leaking from the first oscillation coil and the second oscillation coil and passing through the rail, the first waveform being in synchronization with alternate current magnetic fields outputted from the first and second oscillation coils, obtain a second waveform of a sine component of the magnetic field waveform, the second waveform having a phase shifted 90° from the alternate current magnetic fields, compare the first waveform of the cosine component with a third waveform of an arctangent of the sine component of the check data divided by the cosine component of the check data, and determine the defective point of the rail at a point of the rail at which the first waveform and the third waveform are different from each other.

A rail check system for generating check data for a defect of a rail for vehicles, the rail check system comprising:

• a first oscillation coil and a second oscillation coil which are disposed to face opposite a top portion of the rail, that is a checked object, with center coil axes of the first and second oscillation coils being perpendicular to the top portion of the rail and aligned in a rail longitudinal direction, and configured to generate magnetic fields whose directions are opposite to each other;
• a receiving coil which is disposed between the first oscillation coil and the second oscillation coil and configured to output a magnetic field waveform as the check data based on magnetic field lines leaking from the first oscillation coil and the second oscillation coil and passing through the rail;
• and
• a rail evaluation device configured to perform a rail check process to determine a defective point of the rail at which there is the defect based on the check data received from the rail check device,
• wherein the rail evaluation device displays, based on the check data, a track of the check data on a coordinate plane where an X-axis indicates a cosine component signal of the magnetic field waveform as the check data outputted from the receiving coil based on the magnetic field lines leaking from the first oscillation coil and the second oscillation coil and passing through the rail, the cosine component signal being in synchronization with alternate current magnetic fields outputted from the first and second oscillation coils, and a Y-axis indicates a sine component signal of the magnetic field waveform, the sine component signal having a phase shifted 90° from the alternate current magnetic fields.