Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Polar nephelometer based on a rotational confocal imaging setup

Not Accessible

Your library or personal account may give you access

Abstract

Rapid measurement of the angular distribution of light scattered by particles, the scattering phase function, is achieved by using a new type of polar nephelometer, a device for measuring the angular scattered-light intensity distribution, with a high angular precision and across many orders of magnitude of intensity. The design offers high-speed measurements and avoids many of the problems often associated with traditional goniometers when they are used for measurements of light scattering from small particles or biological cells in suspension. Our system relies on confocal imaging of the test space with off-axis parabolas, using a rotating mirror to scan the angular field of view at the second focus of a pair of conjugated parabolic mirrors, with the test space located at the first focus. The angular resolution of the system is limited mainly by the data-acquisition sampling frequency. In this proof-of-principle demonstration the system performs multiple scans of a 55deg field of view in a very short time (<1  s). To significantly increase the signal-to-noise ratio, we averaged the successively acquired scans during this time. Polystyrene spheres dispersed in water at low concentrations were used to test the system. The scattering patterns obtained were found to be in good agreement with Mie theory calculations.

© 2006 Optical Society of America

Full Article  |  PDF Article
More Like This
Particle sizing with a fast polar nephelometer

Jean-Luc Castagner and Irving J. Bigio
Appl. Opt. 46(4) 527-532 (2007)

Polar nephelometer for atmospheric particulate studies

M. Z. Hansen and W. H. Evans
Appl. Opt. 19(19) 3389-3395 (1980)

Polarized Imaging Nephelometer for in situ airborne measurements of aerosol light scattering

Gergely Dolgos and J. Vanderlei Martins
Opt. Express 22(18) 21972-21990 (2014)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (10)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (9)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved