Apparatus for measuring the transit time of electromagnetic waves

摘要

An apparatus for measuring the transit time of electromagnetic waves has a pulse generator (11) which is arranged in a feedback loop (12) and which can be triggered by pulses. Either the measurement path (13) or a reference path (14) with a reference receiver (16) at the end of it can be selectively included in the feedback loop (12). The pulse generator is also connected to a computing/counting stage (19) which counts the pulse transmitted during the measurement and reference periods separately and computes the transit time therefrom (FIG. 1).