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Proceedings Paper

An optical vortex transmissometer
Author(s): Amanda Alley; Alan Laux; Linda Mullen; Brandon Cochenour
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Paper Abstract

We demonstrate a novel approach for transmissometry that uses an optical vortex for e↵ective discrimination between scattered and ballistic light. Current commercial transmissometers reject unwanted scattered light using a narrow field-of-view (FOV), but this technique fails in multiple scatter environments, or in Mie scattering regimes where large particles create a high probability of scatter near the beam axis. In the optical vortex approach to transmissometry, received light passes through a di↵ractive spiral phase plate. Coherent nonscattered light that passes through the phase plate will create an intensity vortex, while incoherent scattered light will not. The resulting spatial dependence can be exploited to discriminate between the scattered and ballistic light. We present experimental results demonstrating the e↵ectiveness of this approach.

Paper Details

Date Published: 25 May 2018
PDF: 5 pages
Proc. SPIE 10631, Ocean Sensing and Monitoring X, 106310R (25 May 2018); doi: 10.1117/12.2305500
Show Author Affiliations
Amanda Alley, Naval Air Warfare Ctr. (United States)
Alan Laux, Naval Air Warfare Ctr. (United States)
Linda Mullen, Naval Air Warfare Ctr. (United States)
Brandon Cochenour, Naval Air Warfare Ctr. (United States)

Published in SPIE Proceedings Vol. 10631:
Ocean Sensing and Monitoring X
Weilin "Will" Hou; Robert A. Arnone, Editor(s)

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