Evaluation device, the measuring arrangement and method for the path length measurement, as well as the measuring arrangement and method for a coordinate measuring machine and coordinate measuring machine

摘要

An evaluation device (51) for a path length measurement is set up, in order to evaluate a measuring signal (15) of an intensity of a sequence of pulses of electromagnetic radiation, in particular a sequence of light pulses, after passing through of a measurement path length (12, 13) as a function of time represents. The sequence of pulses is of a radiation source, in particular a light source (2), with a repetition rate is generated. The evaluation device (51) is arranged around a first component (73) of the measuring signal (15), which oscillates with a first frequency, and a second component (75) of the measuring signal (15), which oscillates with a second frequency, which is greater than the first frequency, to evaluate. The first frequency, the repetition rate or a multiple of the repetition rate correspond to. The second frequency can correspond to a further multiple of the repetition rate.