Patent ID: 9175947
Filing Date: 2015-11-03
Classification: G01B,G01S

Abstract:
1. A device for determining a position of an object in a spatial region, comprising: a light source for generating a sequence of light pulses with a repetition rate, a power of said sequence of light pulses having a plurality of spectral components spaced in frequency by the repetition rate; a light directing device arranged to direct a portion of a light pulse of said sequence of light pulses into said spatial region; a detector arrangement configured to detect a plurality of light signals which, within said spatial region, are reflected and/or scattered into a plurality of different directions; and an evaluation circuit coupled to said detector arrangement and having a reference signal input for receiving a reference signal, said evaluation circuit being configured to determine, for each light signal of said plurality of light signals detected by said detector arrangement, an associated phase difference between said reference signal and a signal component of the respective light signal, said signal component respectively having a frequency which corresponds to a multiple of said repetition rate, said position of said object being determined based on said phase differences associated with said plurality of light signals; and wherein said evaluation circuit comprising: a mixer having an input to receive said signal component and further having an output, and a further mixer having a further input coupled to the output of the mixer.