Measurements of beam spread in new sea ice

Gary D. Gilbert; Jon S. Schoonmaker

doi:10.1117/12.21490

1 September 1990 Measurements of beam spread in new sea ice

Gary D. Gilbert, Jon S. Schoonmaker

Proceedings Volume 1302, Ocean Optics X; (1990) https://doi.org/10.1117/12.21490
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

Abstract

Measurements were made of the spread of a gaussian argon ion (489 nm) laser beam as it passed through up to 20 cm of sea ice grown in a water tank at air temperatures of -15, -25, and -35°C. These growth temperatures were selected to cover a range of ±10°C about the sea ice eutectic temperature of T_eut = -21.2°C. The Beam Spread Function (BSF) and the transform related Modulation Transfer Function (MTF) were obtained for increasing thicknesses of ice grown at these temperatures. In general the BSF could be represented as the sum of a gaussian distribution of narrow width and large amplitude due to multiple narrow angle forward scattering and a smaller wider spread associated with a growing diffuse light field from multiple wider angle scattered light. For ice grown at all temperatures rms spread was found to follow a 3/2 power law with ice thickness. The rms spread was found to be less in the ice grown at the colder temperatures due to increased attenuation with the smaller ice crystal size.

Citation Download Citation

Gary D. Gilbert and Jon S. Schoonmaker "Measurements of beam spread in new sea ice", Proc. SPIE 1302, Ocean Optics X, (1 September 1990); https://doi.org/10.1117/12.21490

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