Compensation method for attenuated planar laser images of optically dense sprays.

We present a method for compensating laser attenuation in optically dense sprays, in particular for use in combustion engine research. Images of the fuel sprays are produced by planar laser imaging, where Mie scattered light from a cross section of the spray is imaged onto a CCD camera. The compensation scheme is based on the Beer-Lambert law, which is used here to sum up the loss of light along the path of the laser in the image, and to compensate iteratively, pixel by pixel, for this loss.

[1]  Raffaele Ragucci,et al.  Analysis of diesel sprays through two-dimensional laser light scattering , 1989 .

[2]  Z. Kam,et al.  Absorption and Scattering of Light by Small Particles , 1998 .

[3]  H. Semerjian,et al.  APPLICATION OF LASER DIAGNOSTIC TECHNIQUES FOR THE EXAMINATION OF LIQUID FUEL SPRAY STRUCTURE , 1990 .

[4]  J. Koo,et al.  Comparisons of Measured Drop Sizes and Velocities in a Transient Fuel Spray with Stability Criteria and Computed PDF's , 1991 .

[5]  A. Eckbreth.  Laser Diagnostics for Combustion Temperature and Species , 1988 .

[6]  R D Boyle,et al.  Interferometric laser imaging for droplet sizing: a method for droplet-size measurement in sparse spray systems. , 1995, Applied optics.

[7]  Thierry Baritaud,et al.  Planar liquid and gas fuel and droplet size visualization in a DI diesel engine , 1991 .

[8]  M. Aldén,et al.  Three-dimensional flow visualization with picosecond Mie scattering and streak-camera detection. , 1995, Applied optics.

[9]  T. Kamimoto,et al.  A New Technique for the Measurement of Sauter Mean Diameter of Droplets in Unsteady Dense Sprays , 1989 .

[10]  Dennis L. Siebers,et al.  Liquid-Phase Fuel Penetration in Diesel Sprays , 1998 .

[11]  Michael L. Corradini,et al.  Image Analysis of Diesel Sprays , 1992 .

[12]  Andreas Cronhjort,et al.  Long‐working‐distance microscope used for diesel injection spray imaging , 1996 .

[13]  M. Versluis,et al.  2-D absolute OH concentration profiles in atmospheric flames using planar LIF in a bi-directional laser beam configuration , 1997 .