Abstract

We have built a new fisheye camera radiometer to measure the in-water spectral upwelling radiance distribution. This instrument measures the radiance distribution at six wavelengths and obtains a complete suite of measurements (6 spectral data images with associated dark images) in approximately 2 minutes (in clear water). This instrument is much smaller than previous instruments (0.3 m in diameter and 0.3 m long), decreasing the instrument self-shading. It also has improved performance resulting from enhanced sensor sensitivity and a more subtle lens rolloff effect. We describe the instrument, its characterization, and show data examples from both clear and turbid water.

© 2005 Optical Society of America

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Appl. Opt. (3)

Bull. Scripps Inst. Oceanogr. (1)

J. E. Tyler, �??Radiance distribution as a function of depth in an underwater environment,�?? Bull. Scripps Inst. Oceanogr. 7, 363-41 (1960).

J. Atmosph. and Ocean. Techn. (1)

K. J. Voss and G. Zibordi, �??Radiometric and geometric calibration of a spectral electro-optic "fisheye' camera radiance distribution system,�?? J. Atmosph. and Ocean. Techn. 6, 652-662 (1989).

J. Geophys. Res. (1)

E. Aas and N. K. Hojerslev, �??Analysis of underwater radiance distribution observations: apparent optical properties and analytical functions describing the angular radiance distributions,�?? J. Geophys. Res. 104, 8015 �?? 8024 (1999).
[CrossRef]

J. Opt. Soc. Am. (1)

Limnol. Oceanogr. (3)

G. Zibordi and J.-F. Berthon, �??Relationships between the Q-factor and seawater optical properties in a coastal region,�?? Limnol. Oceanogr. 46, 1130-1140 (2001).

K. J. Voss, C. D. Mobley, L. K. Sundman, J. Ivey, and C. Mazell, �??The spectral upwelling radiance distribution in optically shallow waters,�?? Limnol. Oceanogr. 48, 364 �?? 373 (2003).

K. J. Voss and A. Morel, �??Bidirectional reflectance function for oceanic waters with varying chlorophyll concentrations: measurements versus predictions,�?? Limnol. Oceanogr. 50, 698 �?? 705 (2005).

Ocean Optics XV (1)

J. P. Doyle and K. J. Voss, �??3D Instrument Self-Shading effects on in-water multi-directional radiance measurements,�?? presented at Ocean Optics XV, Monaco, 16-20 Oct. 2000.

Oceanologia (1)

J. Piskozub, �??Effect of ship shadow on in-water irradiance measurements,�?? Oceanologia 46, 103-112 (2004).

Opt. Eng. (1)

K. J. Voss, �??Electro-optic camera system for measurement of the underwater radiance distribution,�?? Opt. Eng. 28, 241-247 (1989).

Proc. SPIE (1)

K. J. Voss and A. L. Chapin, �??Next generation in-water radiance distribution camera system,�?? in Ocean Optics XI, G. D. Gilbert, eds., Proc. SPIE 1750, 384 �?? 387 (1992).

Transport Theory and Statistical Physics (1)

W. S. Helliwell, G. N. Sullivan, B. Macdonald, and K. J. Voss, �??A finite-difference discrete-ordinate solution to the three dimensional radiative transfer equation,�?? Transport Theory and Statistical Physics 19, 333-356 (1990).

Other (1)

F. L. Pedrotti and L. S. Pedrotti, Introduction to Optics (Prentice Hall, New Jersey, 1993).

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