Calibration system and method of using mid-ir laser measure...

Details Calibration system and method of using mid-ir laser measure... Calibration system and method of using mid-ir laser measure...

G - Physics

01

N

G01N 21/17 (2006.01) G01N 21/25 (2006.01) G01N 21/15 (2006.01)

Patent

CA 2724597

A method is provided of calibrating a system that detects presence of a pollution component within exhaust gases proceeding along an exhaust passageway. A measurement cell of a probe is isolated by movement of either the entire probe or a shield within the probe from the exhaust gas to allow reference gas to be detected by a laser beam in the mid-infrared range in the measurement cell to calibrate the system. In another example, a laser source is placed on one side of an exhaust passageway and a detector is placed on the other side. A reference cell is provided that is used to receive reference gas and calibrate the system. In yet another example, the exhaust gas is extracted from the passageway and is measured in a reference cell. The reference cell is also filled with reference gas when it is desired to calibrate the system.

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