Innovative applications of optical fibers in the measurement of in-situ spectra

David A. Neuschuler; Charles Rockwell Booth; John H. Morrow

doi:10.1117/12.140661

31 December 1992 Innovative applications of optical fibers in the measurement of in-situ spectra

David A. Neuschuler, Charles Rockwell Booth, John H. Morrow

Proceedings Volume 1750, Ocean Optics XI; (1992) https://doi.org/10.1117/12.140661
Event: San Diego '92, 1992, San Diego, CA, United States

Abstract

As the theoretical understanding of bio-optical relationships increases, new tools for measuring ocean optical properties will be needed, particularly using a spectral resolution approaching 1 nm. Continuing improvements in grating technology for spectrometers coupled with the development of high quality CCD detectors has afforded the opportunity to experiment with a number of innovative instrument designs. However, optical sensors for use in oceanographic instruments must be designed to operate over a wide dynamic range, both spectrally over the region of interest, and radiometrically over a wide range of signal level as flux is lost with increasing depth. This is especially true for work in the ultraviolet, where signal levels are very low compared to the visible region of the spectrum and where attenuation of the flux by water is high. In this paper, the use of optical fibers, imaging spectrographs, and CCD photodetectors in the construction of a multi-channel marine spectroradiometer is presented. Stress induced changes in transmission can result in large artifacts when uncompensated optical fibers are used as part of the light path. Special emphasis is placed on the impact of stray-light characterization on the use of the spectrograph. The design and specification of the fiber optic cable, disperser, and CCD camera are presented, as well as implications to ocean optics of the special considerations that must be taken into account when spectrographs are deployed in the sea.

Citation Download Citation

David A. Neuschuler, Charles Rockwell Booth, and John H. Morrow "Innovative applications of optical fibers in the measurement of in-situ spectra", Proc. SPIE 1750, Ocean Optics XI, (31 December 1992); https://doi.org/10.1117/12.140661

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