Integrating cavity device for measuring the optical backscattering coefficient in a fluid

We present the mathematical description, design, and development of an instrument that precisely determines the backscattering coefficient (b ) in water using a custom integrating cavity to collect light scattered in the backward hemisphere-a true b meter. The design allows us to directly measure b...

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Bibliographic Details
Published inApplied optics. Optical technology and biomedical optics Vol. 57; no. 24; p. 6943
Main Authors Broiles, Eleonora Figueroa, Cone, Michael, Orrico, Cristina, Dewey, Michel, Derr, Alex, Twardowski, Michel, Fry, Edward S
Format Journal Article
LanguageEnglish
Published United States 20.08.2018
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Summary:We present the mathematical description, design, and development of an instrument that precisely determines the backscattering coefficient (b ) in water using a custom integrating cavity to collect light scattered in the backward hemisphere-a true b meter. The design allows us to directly measure b in a medium while not making any assumptions about the shape of β(θ) and/or of its scattering particulates. The concave surface of the quartz aperture to the integrating cavity minimizes reflection losses. The output signal is a direct linear function of b . This b meter is the first instrument to make a direct measurement of b with <1% accuracy and it is compatible with several modes of routine oceanic deployment.
ISSN:2155-3165
DOI:10.1364/AO.57.006943