| 摘要 |
<p>The invention relates to a method and a device for determining a modification at one object or a modification caused by an object (1.26), wherein a measurement of the light propagation time is also possible. According to the invention, an amplitude control (1.6) regulates a transmitter light source (1.8) and a reference light source (1.9) on the basis of a control value (1.29) in such a way that the signals from the corresponding associated light paths have approximatively the same value at the input of a comparator (1.19). As a result, an alternative detection of extraneous light is possible. In addition, a phase regulation for measuring the light propagation time can be provided.</p> |
