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Proceedings Paper

An Advanced Polar Nephelometer (FAN I)
Author(s): Edward J. Burlbaw; W. M. Farmer
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Paper Abstract

A fiber array polar nephelometer of advanced design, the FAN I, is capable of in-situ phase function measurements of scattered light from man-made or natural atmospheric particles. The scattered light is measured at 100 different angles throughout 360 degrees, thus potentially providing a measurement of the asymmetry of irregularly shaped particles. Phase functions can be measured at 10 to 100 Hz rates and the range of measurable single particle sizes is from 5gm to as large as 8mm. For particles smaller than 5gm the ensemble average can be measured. The FAN I is microprocessor controlled and the data may be stored on floppy disk or printed out in tabular and/or graphical form. The optical head may be separated from the computer system for operation in field or adverse conditions. Examples of laboratory measured scattering phase functions obtained with the FAN I for spherical and irregular particles are given to illustrate its measurement capabilities.

Paper Details

Date Published: 3 January 1986
PDF: 4 pages
Proc. SPIE 0566, Fiber Optic and Laser Sensors III, (3 January 1986); doi: 10.1117/12.949776
Show Author Affiliations
Edward J. Burlbaw, Science and Technology Corporation (United States)
W. M. Farmer, Science and Technology Corporation (United States)

Published in SPIE Proceedings Vol. 0566:
Fiber Optic and Laser Sensors III
Emery L. Moore; O. Glenn Ramer, Editor(s)

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