Photo-acoustic measurements of gas and aerosol absorption with diode lasers.
The results of designing multipurpose high-sensitive photo-acoustic (PA) detectors and their application to high-resolution diode laser spectroscopy of molecular gases, gas analysis, and aerosol absorption measurements are summarized in this paper. The hardware and software of the diode laser spectrometer with a Helmholtz resonant PA detector providing an absorption sensitivity limit of better than 10(-7)Wm(-1)Hz(-1/2) are described. A procedure is proposed for an experiment involving the measurements of the rotational structure of hot vibrational bands of molecules. The results of the application of the nonresonant PA cell with temporal resolution of signals to measurements of weak nonresonant absorption of gases and soot aerosols are presented, and the possibility of creating a broad-band PA laser diode aerosol-meter is discussed.
Ponomarev
Yu N
YN
Institute of Atmospheric Optics SB RAS, Akademicheskii ave. 1, Tomsk 634055, Russia. yupon@iao.ru
D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D003627:Data Interpretation, Statistical; D007834:Lasers; D008697:Methane / Q000737:chemistry; D013053:Spectrophotometry / Q000295:instrumentation; D013997:Time Factors; D014867:Water / Q000737:chemistry
D014867:Water; D008697:Methane