Method and device for optical distance measurement

Details Method and device for optical distance measurement Method and device for optical distance measurement

G - Physics

01

S

G01S 13/12 (2006.01) G01S 17/10 (2006.01) G01S 17/36 (2006.01)

Patent

CA 2473914

The invention relates to a method and a device for measuring optical distance by emitting an amplitude-modulated, bundled optical signal and by receiving the signal reflected on the target object. The modulation frequency is continuously regulated by means of a regulation loop in such a way that a fixed phase difference, which is independent from the distance, is maintained between the emitted signal and the received signal. The aim of the invention is to reduce the means required for the distance evaluation circuit, simultaneously maintaining a high level of precision, and to increase the obtainable regulation speed. To this end, the phase difference is detected by means of a phase comparator.

La présente invention concerne un procédé et un dispositif de télémétrie optique par émission d'un signal optique en faisceau, à modulation de phase, et réception du signal réfléchi sur l'objet cible. Selon l'invention, la fréquence de modulation est régulée en continu par l'intermédiaire d'une boucle de régulation de manière à maintenir une différence de phase fixe, ne dépendant pas de la distance, entre le signal émis et le signal reçu. L'invention vise par ailleurs à réduire les moyens nécessaires à la mise en oeuvre du circuit d'évaluation de distance, tout en conservant une précision élevée, et à augmenter la vitesse de régulation. A cet effet, la détection de la différence de phase est effectuée à l'aide d'un comparateur de phase.

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