Optical instrument for measuring concentrations of polluting...

Details Optical instrument for measuring concentrations of polluting... Optical instrument for measuring concentrations of polluting...

G - Physics

01

J

73/55

G01J 3/42 (2006.01) G01J 3/427 (2006.01) G01J 3/457 (2006.01) G01J 3/28 (2006.01)

Patent

CA 1041317

ABSTRACT OF THE DISCLOSURE: An optical instrument for measuring concentrations of polluting gases on long and short geometrical paths is charac- terized in that it comprises: a spectrometer and a telescope adapted to focalize a light beam, coming from a source located at a predetermined distance, into the slit of the spectrometer; at least a cell, containing a known concentration of the polluting gas under examination. It further comprises first control means to bring the source along the path of the light beam between the telescope and the slit. The spectrometer is adapted to disperse and focalize the light beam in its own outlet focal plane. There is provided with slits and means to move a mask which is located on the outlet focal plane of the spectrometer. The mask together with the moving means are suitable to effect the sampling of the dispersed light beam in at least four series of wave length ranges. A photodetector gives at its outlet electrical signals when receiving at its inlet light signals caused by the sampling. An electronic apparatus, located at the outlet of said photodetector, is suitable to deal with the electric signals to give at the outlet a numerical value which is a function of the concentration of polluting gases.

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