New instrument for simultaneous measurement of the daylight field's optical properties above and under water

K. Bochter; C. Wallhauber

doi:10.1117/12.266373

6 February 1997 New instrument for simultaneous measurement of the daylight field's optical properties above and under water

K. Bochter, C. Wallhauber

Author Affiliations +

Proceedings Volume 2963, Ocean Optics XIII; (1997) https://doi.org/10.1117/12.266373
Event: Ocean Optics XIII, 1996, Halifax, Nova Scotia, Canada

Abstract

Sequential measurements of the light field above and under water are affected by changes in the ambient light field. For correlated measurements, a new instrument is being developed, based on an imaging spectrometer with a 'flat field' grating. Nine optical fibers connected to different light collectors are attached to the entrance slit. A slow scan camera equipped with a cooled area array CCD allows the simultaneous recording of all nine spectra in the range from 400 nm to 850 nm. The glass fibers are distributed into tow groups. Two fibers are relayed to a unit measuring the downwelling vector irradiance and upwelling radiance above the water to determine the remote sensing reflectance and to detect light level changes. The remaining seven fibers are connected to a submersible unit measuring the light field parameters necessary to compute the in situ absorption spectrum of the water column, the change of mean cosine with depth, the Q-factor and other important apparent optical properties.

Citation Download Citation

K. Bochter and C. Wallhauber "New instrument for simultaneous measurement of the daylight field's optical properties above and under water", Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); https://doi.org/10.1117/12.266373

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