Interferometric distance-measuring method with delayed chirp...

G - Physics – 01 – B

Patent

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G01B 9/02 (2006.01) G01B 11/02 (2006.01) G01S 7/481 (2006.01) G01S 7/499 (2006.01) G01S 17/32 (2006.01)

Patent

CA 2723346

In a distance-measuring method comprising a distance- measuring apparatus having at least one frequency- modulatable laser source for producing chirped laser radiation. The laser radiation has radiation components with opposite chirp as time dependency of the modulated wavelengths, the simultaneous oppositeness of the frequency curve being realized via an optical delay path (3) for one of the two radiation components. The radiation produced is passed in a measuring interferometer (5) to a target (6) and parallel via a local Oscillator. After reception of the laser radiation scattered back from the target (6) and passed via the local oscillator path, the laser radiation received is converted into signals and the distance to the at least one target (6) is determined from the signals on the basis of interferometric mixing.

L'invention porte sur un procédé de mesure de la distance qui fait appel à un appareil de mesure de la distance comprenant au moins une source laser à fréquence modulable pour produire un rayonnement laser à fluctuation de la fréquence d'impulsion. Le rayonnement laser possède des composantes de rayonnement qui présentent une fluctuation opposée de la fréquence d'impulsion variant dans le temps par rapport aux longueurs d'ondes modulées, l'opposition simultanée de la courbe de fréquence étant obtenue par le biais d'un chemin de retard optique (3) pour l'une des deux composantes du rayonnement. On fait passer le rayonnement produit dans un interféromètre de mesure (5) jusqu'à une cible (6), parallèlement à un oscillateur local. A la réception du rayonnement laser dispersé depuis la cible (6) et passant à travers le chemin de l'oscillateur local, on convertit ledit rayonnement en signaux et on mesure la distance jusqu'à la cible précitée (6) à partir des signaux, sur la base du mélange interférométrique.

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