Electro-optical measuring device for absolute distances

G - Physics – 01 – S

Patent

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Details

G01S 17/06 (2006.01) G01B 11/00 (2006.01) G01C 3/00 (2006.01) G01S 7/491 (2006.01) G01S 7/499 (2006.01) G01S 17/32 (2006.01) G01S 17/36 (2006.01)

Patent

CA 2205937

Electro-optical measuring device for absolute distances to a target point. In addition to the beam polarization being modulated as is required for the Fizeau method, the invention provides that the modulation means contain a modulator crystal (8; 7) having electrodes which are connected to a variable DC source (11; 10), and that a control apparatus (19) is provided which initiates the determination of the value of the modulation phase in the region of minimum brightness at the associated modulation frequency, successively for different DC voltage values over a full cycle of the basic polarization of the modulator crystal, stores and averages the measured values repeats the measurement at a slightly changed modulation frequency if the mean value is not zero and uses interpolation to determine the modulation frequency which is associated with the mean modulation phase value of zero. The measuring device is particularly suitable for coupling to a tracking system based on interferometry.

L'invention concerne un appareil de mesure électro-optique pour mesurer des distances absolues par rapport à un point cible. Outre une modulation de la polarisation du faisceau requise selon la méthode Fizeau, il est prévu que les éléments de modulation contiennent un cristal modulateur (8; 7) avec des électrodes, reliées à une source de tension continue (11; 10) variable. Il est en outre prévu un dispositif de commande (19) qui déclenche la détermination de la valeur de la phase de modulation dans la zone de luminosité minimale pour la fréquence de modulation appropriée successivement en cas de valeurs de tension continue différentes, sur une période complète de polarisation de base du cristal modulateur. Ce dispositif de commande (19) mémorise les valeurs mesurées et calcule la moyenne de ces valeurs et, en cas de moyenne s'écartant de zéro, refait la mesure à une fréquence de modulation légèrement modifiée; il détermine également, par interpolation, la fréquence de modulation correspondant à la moyenne de phases de modulation zéro. L'appareil de mesure s'utilise notamment pour un couplage avec un système de poursuite fondé sur l'interférométrie.

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