METHOD AND DEVICE FOR DETERMINING RELATIVE CONCENTRATION OF ISOPOLYMERS OF CARBON DIOXIDE Russian patent published in 2008 - IPC G01N15/00 

FIELD: measuring technique.

SUBSTANCE: method comprises scanning the optical frequency of the laser in the analytic spectral range by means of modulation of the excitation current, recording the laser transmission spectrum of the fluid containing absorption lines of molecules ¹²CO₂ and ¹³CO₂, and calculating the spectrum of the coefficient of absorption in the lines with regard of the intensity of the laser radiation out of the analytical absorption lines. The device comprises retuned semiconducting laser, excitation unit, unit of control of spectral and power parameters of the radiation of the retuned semiconducting laser, unit for detecting laser radiation, unit for preliminary amplification of recorded radiosignal, and unit for processing the laser transmission spectra.

EFFECT: simplified method and enhanced precision of device.

2 cl, 3 dwg