An evaluation device for path length measurement configured to evaluate a measured signal representing an intensity of a sequence of pulses of electromagnetic radiation, particularly a sequence of light pulses, as a function of time, after the sequence has traveled through a path length to be measured. The sequence of light pulses is generated with a repetition rate by a radiation source, particularly a light source. The evaluation device is configured to evaluate a first component of the measured signal, which oscillates with a first frequency, and a second component of the measured signal, which the second component oscillates with a second frequency that is greater than the first frequency. The first frequency may correspond to the repetition rate or a multiple of the repetition rate. The second frequency may correspond to another multiple of the repetition rate.