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Experimental and theoretical investigation of photoacoustic-signal generation by wavelength-modulated diode lasers (1994)

Miklós, A. ; Bozóki, Z. ; Jiang, Y. ; [et al.]

Springer

Applied physics 58 (1994), S. 483-492

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ISSN: 1432-0649

Keywords: 43.25.Ud ; 43.20.Ye

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The dependence of photoacoustic spectra on different experimental parameters was investigated by both theoretical and experimental means. The experiments were carried out with an inexpensive resonant optoacoustic system based on near-infrared laser diodes, which allowed photoacoustic and direct absorption spectra to be recorded simultaneously. The experimental observations were compared to theoretical predictions. It was also demonstrated that source-frequency (wavelength) modulation at the resonance frequency of the cell provides superior signal to noise ratio compared to amplitude modulation and eliminates background drifts and fluctuations.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01081079

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An efficient pressure-velocity procedure for gas-droplet two-phase flow calculations (1992)

Chen, C. P. ; Shang, H. M. ; Jiang, Y.

Chichester : Wiley-Blackwell

International Journal for Numerical Methods in Fluids 15 (1992), S. 233-245

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ISSN: 0271-2091

Keywords: Two-phase flow ; Pressure-velocity coupling ; Transient flow ; Turbulent dispersion ; Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: This paper presents a non-iterative numerical technique for computing time-dependent gas-droplet flows. The method is a fully interacting combination of Eulerian fluid and Lagrangian particle calculations. The interaction calculations between the two phases are formulated on a pressure-velocity-coupling procedure based on the operator-splitting technique. This procedure eliminates the global iterations required in the conventional particle-source-in-cell (PSIC) procedure. Turbulent dispersion calculations are treated by a stochastic procedure. Numerical calculations and comparisons with available experimental data as well as efficiency assessments are given for some sprays typical of spray combustion applications.

Additional Material: 4 Ill.