STRAY-LIGHT TOLERANT LIDAR MEASUREMENT SYSTEM AND STRAY-LIGHT TOLERANT LIDAR MEASUREMENT METHOD

摘要

The invention relates to a stray-light tolerant lidar measurement system and a method for detecting the presence/movement of particles using a stray-light tolerant lidar measurement system. The measurement system comprises an interferometer assembly having a continuous-wave laser source (2), a photodetection arrangement (7) and optical components The continuous-wave laser source (2) further comprises a laser light generating component (20), a downstream optical phase modulator (21) and a control unit (22) which is connected and adjusted to the optical phase modulator (21), to deliver a control signal, which corresponds to a pseudo-noise signal defined by a predetermined phase function (Θ(t)). In addition, the interferometer assembly comprises an evaluation unit (9) which is coupled and adjusted to the interferometric photodetector assembly (7), to detect the detector signals of same and to determine the presence and/or movement of particles and/or objects from the detector signals wherein, in the case of two wavelengths emitted from the laser light generating components (20), the detector signals are detected separately in two wavelength regions, and wherein the phase function (Θ(t)) has a predetermined almost step-like time course and the evaluation unit (9) scans the detector signals in synchrony with the timing of the steps of (Θ(t)).