Abstract
We used light-scattering techniques to measure the angular divergence of a soot-particle beam produced by an aerodynamic-lens system in common use. Soot was generated in an atmospheric coflow ethylene diffusion flame and focused using this aerodynamic-lens system. The width of the beam generated was probed every ∼32μm over a range of more than 100mm downstream of the exit nozzle by imaging laser light scattered from the particle beam onto an intensified CCD camera. We collected transmission electron microscopy (TEM) grids downstream of the exit nozzle and analysed the images to size the particles focused in the beam. Our measurements yield a divergence angle in the range of 2.24–2.59mrad corresponding to a solid angle of 1.59–2.11×10−5sr for a soot lognormal size distribution with an average projected area equivalent diameter of 88nm and median of 73nm. We characterized three similar aerodynamic-lens systems. Our results demonstrate that the radial profile of the particle beam has more Gaussian character near the exit of the aerodynamic-lens system and is almost purely Lorentzian in character further downstream of the lens-system exit.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
