REMOTE OPTICAL ABSORPTION LASER GAS ANALYZER Russian patent published in 2020 - IPC G01N21/61 G01N21/3504 

FIELD: measuring equipment.

SUBSTANCE: remote optical absorption laser gas analyzer relates to measurement equipment and can be used for remote measurement of concentration of impurities of exhaust gases of a moving vehicle, including methane, carbon dioxide, carbon monoxide and nitrogen monoxide. Gas analyzer can be used as an element of predictive diagnostics of intelligent vehicle eco monitoring system. Gas analyzer comprises near infrared analysis system (3), consisting of at least two near-infrared (4) laser units, and middle IR-range analysis system (7), consisting of mid-infrared (8) laser unit. Radiation in each laser unit is divided into two parts, one part from each laser unit is transmitted to receiving-transmitting unit of analytical signal (6) and (9), whence through reflecting object is returned to photodetectors of analytical channel (15) and (25), and another part is supplied through reference cells (20) and (29) to photoreceivers of reference signal (21) and (30), wherein synchronization of output and reception of radiation of diode lasers of all laser units is organized by a multiplex circuit. During measurement, radiation power of each diode laser is controlled, by their frequency tuning, recording, processing and comparison of the analytical signal with a reference signal and ultimately calculating concentration of impurities of exhaust gases of the moving vehicle in real time.

EFFECT: high sensitivity and accuracy of measuring concentration of impurities of exhaust gases of a moving vehicle in real time without changing speed of flow of vehicles.

6 cl, 1 dwg