Measurement of grooves and long waves on rails with a longitudinal streak of light

A device, arranged on a measuring platform moving relative to rails, comprising:

• a light-section or laser-triangulation system comprising:
• a laser light source with line optics for projecting a light streak with a limited length and extending in a direction of the movement onto a driving surface of the rails;
• and
• a surface camera with an optical axis that is tilted relative to an optical axis of the laser light source, where the surface camera is directed toward the driving surface and has a picture-taking sequence that is synchronized with a speed of the movement of the measuring platform relative to the rails;
• a signal preprocessing unit;
• a first signal processing unit connected to the signal pre-processing unit, the first signal processing unit estimating an amplitude and a frequency of grooves on the rails by means of incoherent averaging of a frequency spectrum of light-section signals, each light-section signal being formed from an output signal of a photo receiver of the surface camera, the photo receiver having the light streak reproduced on the photo receiver;
• a second signal processing unit connected to the signal pre-processing unit for estimating an amplitude and a frequency of long waves on the rails by means of coherent analysis of the light-section signals;
• a display unit for displaying and calculating amplitudes and frequencies of the grooves and long waves and the arithmetic average rough values of the driving surface of the rails, the arithmetic average rough values being determined from the calculated amplitudes and frequencies.