Apparatus and method for determining a distance to an object...

G - Physics – 01 – N

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G01N 21/00 (2006.01) A01M 7/00 (2006.01) A01M 21/00 (2006.01) G01B 11/00 (2006.01) G01C 3/08 (2006.01) G01J 1/04 (2006.01) G01J 1/44 (2006.01) G01N 21/25 (2006.01) G01N 21/84 (2006.01) G02B 6/00 (2006.01) G05D 1/02 (2006.01)

Patent

CA 2193837

An optical proximity sensor (1) generates information indicative of a distance (DI) to an object (14A) in a field and in some embod- iments also generates information indicative of a spectral reflectance characteristics of the object (14A). The information indicative of the spectral reflectance characteristic can be used to determine whether the object (14A) in the field is a living plant (14A) or another object such as soil (10). Light emitted from the optical sensor (1) for reflection off the object (14A) is modulated so that reflected light from the optical sensor can be discriminated from reflected ambient sunlight. The opti- cal sensor (1) is scanned over the field to map objects in the field and/or to determine the location of rows of crop plants. A sensor in accor- dance with the present invention has many uses in agriculture including spraying, cultivation and vehicle guidance.

Détecteur optique (1) de proximité produisant des informations indiquant la distance (D1) d'un objet (14A) présent dans un champ et dont des variantes produisent en outre des informations fonction d'une caractéristique du spectre réfléchi par l'objet (14A) et permettant de distinguer si l'objet (14A) se trouvant dans le champ est une plante vivante (14A) ou un autre objet tel que de la terre (10). La lumière émise par le détecteur optique (1) pour être réfléchie par l'objet (14A) est modulée, ce qui permet de la différencier de la lumière solaire ambiante réfléchie. Le détecteur optique (1) effectue un balayage du champ pour en inventorier les objets et/ou y localiser les rangées de plantes de culture; il présente de nombreuses applications en agriculture et peut notamment servir pour l'épandage, les travaux de culture et le guidage de véhicules.

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