Solar infrared ground clutter suppressor

G - Physics – 01 – V

Patent

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G01V 8/00 (2006.01)

Patent

CA 2421568

An apparatus for detecting landmines is based on obtaining thermal signatures with an infrared camera (12) of a soil surface where a buried landmine might exist. An optical band filter (14) is positioned in front of the camera, which filter (14) is transmissive to selected band wavelengths but strongly attenuates radiation outside of the selected bands. The filter (14) is one selected to pass radiation in an optical band in which solar radiation is absent or highly attenuated at the earth's surface due to absorption by the molecular aerosol or particulate constitute of the atmosphere. This ensures that most of the solar radiation scattered from the ground surface is blocked from reaching the infrared camera's sensor, thereby eliminating clutter in infrared images of the soil surface.

L'invention concerne un appareil de détection de mines terrestres basé sur l'obtention de signatures thermiques à l'aide d'une caméra infrarouge (12) d'une surface terrestre où pourrait se trouver une mine terrestre. Un filtre (14) à bande optique est positionné devant la caméra, ledit filtre (14) facilitant la transmission dans des longueurs d'ondes de bandes sélectionnées mais atténuant fortement les rayonnements en dehors des bandes sélectionnées. Ce filtre (14) est un filtre sélectionné pour faire passer les rayonnements dans une bande optique dans laquelle les rayonnements solaires sont absents ou fortement atténués à la surface de la terre en raison de l'absorption par les éléments constitutifs moléculaires aérosol ou particulaires de l'atmosphère. Ceci permet de garantir que la majeure partie des rayonnements solaires diffusés de la surface du sol n'atteignent pas le capteur de la caméra infrarouge, éliminant ainsi les parasites des images infrarouges de la surface terrestre.

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