METHOD FOR PRODUCING TIME MARKS AT ANY POINTS ON MOVING COMPONENTS

摘要

The invention relates to a method for producing time marks at any points on moving components and an optical trigger device for carrying out said method, as shown in the figure. According to the invention, light of a broadband light source (1) having a correspondingly short coherence length is split up into tow branches, namely a measuring light branch (3) and a reference light branch (4), and is coupled into two light conductors (5, 6). The light of the reference light branch (4) is at least partially fed back and the light of the measuring light branch (3) is focussed in a measuring point (11) and is reflected by the component that passes through the focus (11). The path of light in the measuring light branch (3) up to the focus (11) and the path of light in the reference light branch (4) up to the feedback level (12, 18) are of the same length within the coherence length of the radiated light. The feedback light of the reference light branch (4) and the measuring light branch (3) is brought to a point of interference and is detected by a detector (14), whereby said light has been fed back. A short modulation event occurs on the detector (14) when the component (13) passes through the focus (11).