25 May 2018 An optical vortex transmissometer
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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.
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Amanda Alley, Amanda Alley, Alan Laux, Alan Laux, Linda Mullen, Linda Mullen, Brandon Cochenour, Brandon Cochenour, "An optical vortex transmissometer", Proc. SPIE 10631, Ocean Sensing and Monitoring X, 106310R (25 May 2018); doi: 10.1117/12.2305500; https://doi.org/10.1117/12.2305500


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