Laser Extinction Setup

Laser_extinctionMass Concentration of soot particles in flames is measured with Line of Sight Attenuation (LOSA) method which is based on laser light extinction principle [1,2]. A laser beam with a wavelength of 632.8 nm passes through the flame and gets attenuated because of soot particle aerosols in the flame. The ratio of the attenuated beam to the incident bean reveals the concentration of soot particles or soot volume fraction at each point in the flame [3].

 

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1. D. R. Snelling, K. A. Thomson, G. J. Smallwood and O. L. Gulder, “Two-dimensional imaging of  soot volume fraction in laminar diffusion flames,” Applied Optics, vol. 38, no. 12, pp. 2478-2485, 1999

2. K. A. Thomson, Ö. L. Gülder, E. J. Weckman, R. A. Fraser, G. J. Smallwood and D. R. Snelling,  “Soot concentration and temperature measurements in co-annular,  nonpremixed CH4/air laminar flames  at pressures up to 4 MPa,” Combustion and Flame, vol. 140, pp. 222-232, 2005

3. M. Saffaripour, M. Kholghy, S. B. Dworkin and M. J. Thomson, “A Numerical and Experimental  Study of Soot Formation in a Laminar Coflow Diffusion Flame of a Jet A-1 Surrogate,” Proceedings of  the Combustion Institute, 2013

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