Mobile remote detection device and remote detection method...

G - Physics – 01 – J

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G01J 3/457 (2006.01)

Patent

CA 2522884

The invention relates to a mobile remote detection device for accumulations of methane, comprising an emitter device having a light source in order to generate air, the wave length of said light source being synchronised with the spectral signature of methane, whereby the light can be directed towards a measuring field. Said detection device also comprises a detector device for detecting backscattered light, and an evaluation device. The aim of the invention is to improve said remote detection device in such a manner that it has a high degree of measuring sensitivity with a compact and stabile structure. According to the invention, the light source generates light at a wave length of between 3200nm and 3300nm at which methane is absorbed and the light source has an optical parametric oscillator with seed-injection, said oscillator being associated with a pump laser which is operated in seed- injection mode.

L'objectif de cette invention est d'améliorer un système mobile de détection à distance d'amas de méthane, lequel système comprend un dispositif émetteur pourvu d'une source lumineuse destinée à produire une lumière dont la longueur d'onde s'accorde avec la signature spectrale du méthane, ladite lumière pouvant être orientée sur un champ de mesure, un dispositif détecteur destiné à détecter la lumière rétrodiffusée ainsi qu'un dispositif d'évaluation, de sorte que ce système de détection à distance présente une haute sensibilité de mesure pour une structure compacte et stable. A cet effet, la source lumineuse produit une lumière d'une longueur d'onde à laquelle le méthane est absorbé, ladite longueur d'onde étant comprise entre 3 200 nm et 3 300 nm, et cette source lumineuse comporte un oscillateur optique paramétrique à injection de germes, oscillateur auquel est associé un laser de pompe actionné en injection de germes.

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