Optical spectral reflectance sensor and controller

G - Physics – 01 – N

Patent

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Details

G01N 21/35 (2006.01) A01C 21/00 (2006.01) G01J 3/427 (2006.01) G01J 3/433 (2006.01) G01N 21/47 (2006.01) G01N 21/31 (2006.01)

Patent

CA 2454827

A spectral reflectance sensor including: a light source for emitting a modulated beam of red light; a light source for emitting a modulated beam of near infrared light; a receiver for receiving reflected light produced by either the red source or the near infrared source; a receiver for receiving incident light from either the red source or the infrared source; a signal conditioner responsive to the modulation such that the signals produced by the receivers in response to reflected and incident light from the source can be discriminated from signals produced by ambient light; and a microprocessor having an input such that the microprocessor can determine the intensities of incident red light, reflected red light; incident near infrared light; and reflected near infrared light. From these intensities, and by knowing the growing days since emergence or planting, the sensor can calculate the mid- growing season nitrogen fertilizer requirements of a plant.

L'invention concerne un capteur de réflectance spectrale comprenant: une source de lumière destinée à émettre un faisceau modulé de lumière rouge; une source de lumière destinée à émettre un faisceau modulé de lumière infrarouge proche; un récepteur destiné à recevoir la lumière réfléchie produite soit par la source rouge, soit par la source infrarouge proche; un récepteur destiné à recevoir une lumière incidente soit de la source rouge, soit de la source infrarouge; un conditionneur de signal répondant à la modulation de manière que les signaux produits par les récepteurs en réponse à la lumière réfléchie et incidente de la source puissent être discriminés des signaux produits par la lumière ambiante; et un microprocesseur possédant une entrée laquelle permet au microprocesseur de déterminer les intensités de la lumière rouge incidente, de la lumière rouge réfléchie; de la lumière infrarouge proche incidente; et de la lumière infrarouge proche réfléchie. A partir de ces intensités, et en connaissance des jours de croissance depuis sa levée ou sa plantation, le capteur peut calculer les besoins moyens en engrais azoté pour une saison de croissance d'une plante.

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