INTERFEROMETRIC DISTANCE-MEASURING METHOD WITH DELAYED CHIRP SIGNAL AND SUCH AN APPARATUS

摘要

In a distance-measuring method comprising a distance- measuring apparatus having at least one frequency- modulatable laser source for producing chirped laser radiation. The laser radiation has radiation components with opposite chirp as time dependency of the modulated wavelengths, the simultaneous oppositeness of the frequency curve being realized via an optical delay path (3) for one of the two radiation components. The radiation produced is passed in a measuring interferometer (5) to a target (6) and parallel via a local Oscillator. After reception of the laser radiation scattered back from the target (6) and passed via the local oscillator path, the laser radiation received is converted into signals and the distance to the at least one target (6) is determined from the signals on the basis of interferometric mixing.