Differential Scattering Cross Section and Total Extinction Measurements on (CH)n Spheres in 632.8 nm Laser Light

摘要

A new laboratory system for aerosol research is discussed from the aspects of design, construction and preliminary testing. The system is subdivided into two cooperating subsystems known as the Optical System (OS) and the Aerosol Circulation/Sampling System (ACSS). Measurement of the extinction, scattering and absorption cross sections of an aerosol is the object of the Optical System. Aerosol production, containment, and sampling are the tasks of the ACSS. Mie scattering theory for monodisperse aerosols is discussed as it applies to the cross section measurements. Preliminary measurements on Polystyrene microspheres (1.0 micron in diameter) are presented. These measurements strongly indicate that the spheres are actually 0.85 micron in diameter. Problem areas in both the hardware and experimental; procedure are presented as a precursor to full scale testing and calibration. Number of pages: 100.