Demodulation reference signal source

G - Physics – 01 – C

Patent

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G01C 19/72 (2006.01)

Patent

CA 2085122

An information retrieval system for extracting information from a pair of substantially coherent electromagnetic waves represented by phase therebetween each of which is incident on a photodetector, and having a demodulator which receives the photodetector output signal and which also recxives a reference signal. The reference signal is obtained through use of a phase shift detector which receives the photodetector signal to determine certain phase shifts occurring therein and provides this information to a reference signal supply to adjust the phase of its output signal which then serves as the reference signal for the demodulator.

Système de recherche documentaire destiné à extraire des informations d'une paire d'ondes électromagnétiques cohérentes représentées par des différences de phase entre ces dernières, chacune étant incidente sur un photodétecteur, et comportant un démodulateur recevant le signal de sortie du photodétecteur et recevant également un signal de référence. Le signal de référence est obtenu par l'emploi d'un détecteur de déphasage recevant le signal du photodétecteur afin de déterminer certains déphasages se produisant dans ce dernier, et transmettant ces informations à une alimentation en signaux de référence afin d'ajuster la phase de son signal de sortie qui ensuite sert de signal de référence au démodulateur.

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