Laser sensor capable of measuring distance, velocity, and...

G - Physics – 01 – S

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G01S 17/36 (2006.01) G01S 7/481 (2006.01) G01S 7/491 (2006.01) G01S 17/50 (2006.01)

Patent

CA 2171216

A light based distance, velocity and acceleration sensor which uses phase difference to determine the desired measurement. A laser signal is modulated by an oscillator signal and reflected off an object to a signal receiver. The reflected laser signal and the oscillator signal then pass through a dual path conditioning circuit, where the path lengths and circuit elements of the two paths are identical to cancel the effets of propagation delays in an output signal. The conditioned signals are passed through a phase comparator, to produce a signal indicative of the phase difference between the oscillator signal and the reflected laser signal. The phase difference is directly proportional to the distance between the sensor and the object.

Détecteur de distance, de vitesse et d'accélération basé sur la lumière, qui utilise la différence de phase pour déterminer une mesure désirée. Un signal laser est modulé par un signal d'oscillateur et réfléchi par un objet vers un récepteur de signaux. Le signal laser réfléchi et le signal d'oscillateur passent ensuite à travers un circuit de conditionnement à deux voies, les longueurs de voie et les éléments de circuit des deux voies étant identiques de manière à annuler les effets des retards de propagation dans un signal de sortie. Les signaux conditionnés sont passés à travers un comparateur de phases pour produire un signal indiquant la différence de phase entre le signal d'oscillateur et le signal laser réfléchi. La différence de phase est directement proportionnelle à la distance entre le détecteur et l'objet.

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