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Proceedings Paper

Calibration and accuracy of optical slope measurements for short wind waves
Author(s): Bernd Jaehne; Howard J. Schultz
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Paper Abstract

A thorough understanding of the hydrodynamics of short ocean wave is important for interpreting measurements made by active microwave remote sensing instruments. However, conventional methods for studying the structure of a water surface are not capable of resolving the fine scale structure of the surface, especially in the ultra-gravity and capillary wavelengths. Optical instruments have the potential for resolving the fine-scale structure of the ocean surface, however, methods for calibrating these instruments and verifying the accuracy of the measurements have not been developed. In this paper we describe a multi-faceted approach for verifying the accuracy and calibration of an imaging wave slope gauge (ISG). The first step is a thorough theoretical analysis of the geometrical optics and photometry. A detailed discussion on the relationship between surface slope and observed pixel intensity is presented. This discussion includes second order effects which may tend to bias the results. Secondly, calibration objects formed from thin transparent Perspex sheets with known slope and height profiles are retrieved. The results show that the measurements of the water surface shape are accurate enough to compute 2-D wave number spectra.

Paper Details

Date Published: 22 December 1992
PDF: 12 pages
Proc. SPIE 1749, Optics of the Air-Sea Interface: Theory and Measurement, (22 December 1992); doi: 10.1117/12.138851
Show Author Affiliations
Bernd Jaehne, Scripps Institution of Oceanography (United States)
Howard J. Schultz, Univ. of Massachusetts/Amherst (United States)

Published in SPIE Proceedings Vol. 1749:
Optics of the Air-Sea Interface: Theory and Measurement
Leland Estep, Editor(s)

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