MULTIPASS SAMPLE CUVETTE Russian patent published in 2020 - IPC G01N21/03 

FIELD: monitoring and measuring equipment.

SUBSTANCE: invention relates to a sample cuvette, for example a sample cuvette for use in gas analysis based on laser absorption spectroscopy. Disclosed detection system comprises: at least one laser configured to output at least one laser radiation beam for absorption by one or more different connections; sample cuvette intended for containing a certain volume of gas sample; at least one guiding device configured to direct said at least one laser radiation beam into a sample cuvette; and a detector device for detecting output radiation from the cuvette. Sample tray includes: first and second opposite reflecting elements (80, 82); inlet (84) in the first reflecting element (80) and outlet (86) in the second reflecting element (82). At that, inlet and outlet holes are made so that during operation radiation, introduced into the cuvette through inlet (84) is reflected at least once by the second reflecting element (82) and at least once by the first reflecting element (80) before exiting from the cuvette through outlet (86), and wherein during operation said radiation is reflected from first reflecting element in plurality of first reflection points and reflected from second reflecting element in plurality of second reflection points (90), and a control device for obtaining relative rotational movement of the second reflecting element (82) and the first reflecting element (80) with location of outlet (86) in the selected point from said plurality of second reflection points (90), wherein the path through which radiation between the inlet and outlet holes follows determines the path length. Control device is configured to cause relative movement of outlet opening (86) and second reflection points (90) by predetermined distances, corresponding to spacing of second reflection points (90), and is additionally configured to change in stepwise manner the position of outlet opening (86) from one of second reflection points (90) to the next of second reflection points (90) to vary the path length in discrete intervals of distance.

EFFECT: technical result is creation of compact system for gas analysis.

14 cl, 5 dwg