A new infrared laser based alarm

G - Physics – 01 – N

Patent

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Details

G01N 21/39 (2006.01) G01N 21/53 (2006.01) G01N 21/85 (2006.01) G08B 17/103 (2006.01) G08B 17/107 (2006.01)

Patent

CA 2611024

The subject invention relates to a new alarm which is based on using a quarternary tuneable Mid-IR laser to measure both particles and gas at the same time. The measurement is done within an area of which the gas of interest will absorb the Mid-IR radiation. By widely tuning the emission wavelength of the laser, several wavelengths can be measured in order to accurately find both gas composition and particle density with one laser based sensor. We tested a new device which use radiation between 2.27~m and 2.316~m. Metane gas reduces intensity of the radiation at certain wavelengths in this device, while particles/fog reduce intensity for all wavelengths. In this case, fog should not trigger an alarm, while methane leaks should. This can also be applied for CO and smoke in which one sensor will measure both parameters to sound an alarm instead of just one parameter.

L'invention concerne une nouvelle alarme basée sur l'utilisation d'un laser Mid-IR quaternaire accordable de mesure simultanée de particules et de gaz. Cette mesure est effectuée dans une zone dans laquelle le gaz ciblé absorbe le rayonnement Mid-IR. L'accord selon un large spectre de la longueur d'onde d'émission du laser permet de mesurer plusieurs longueurs d'ondes afin de déterminer avec précision la composition du gaz et la densité des particules à l'aide d'un capteur laser. Un nouveau dispositif a été testé, avec un rayonnement entre 2,27?m et 2,316?m. Le méthane réduit l'intensité du rayonnement à certaines longueurs d'ondes dans ledit dispositif, tandis que les particules/le brouillard réduisent l'intensité pour toutes les longueurs d'ondes. Dans ce cas, le brouillard ne devrait pas déclencher l'alarme, contrairement aux fuites de méthane. Ceci peut également s'appliquer pour le CO et la fumée, le détecteur mesurant les deux paramètres pour déclencher l'alarme au lieu d'un seul paramètre.

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