Ocean-Optical Measurements Using Acousto-Optic Filtering

Frank M. Caimi

doi:10.1117/12.964231

7 August 1986 Ocean-Optical Measurements Using Acousto-Optic Filtering

Frank M. Caimi

Proceedings Volume 0637, Ocean Optics VIII; (1986) https://doi.org/10.1117/12.964231
Event: 1986 Technical Symposium Southeast, 1986, Orlando, United States

Abstract

Spectral radiometric, scattering, and absorption measurements have classically been accomplished using grating spectrometers or fixed passband optical filters. Recently, holographic optical elements and linear-geometry detectors have gained popularity in spectrometric instrumentation, thereby eliminating the need for movable mechanical components. Other mechanically-fixed methods of spectral filtering rely upon electro- or acousto-optic interaction in solids or liquids. A system useful for ocean-optical measurements is described which employs an acousto-optic filter under microcomputer control to achieve wavelength tunability from 400-700 nm. This approach allows construction of low-power instrumentation having rapid and programmable control. In addition, output beam collimation is maintained to facilitate measurement over long optical paths. The physical principle of operation is described, various trade-offs discussed, and results presented for seawater containing phytoplankton.

Citation Download Citation

Frank M. Caimi "Ocean-Optical Measurements Using Acousto-Optic Filtering", Proc. SPIE 0637, Ocean Optics VIII, (7 August 1986); https://doi.org/10.1117/12.964231

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