UNDERWATER VISIBILITY METER CONCEPT STUDY.
STANFORD RESEARCH INST MENLO PARK CALIF
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The objective was to find concepts of instruments with which to predict underwater visibility from characteristics of the local water mass. Concurrent analytical and experimental programs were carried out. The optical characteristics which must be measured were identified. An improved transmissometer was devised and tested. Instruments with which to measure the volume absorption coefficient and the volume backscattering coefficient were invented and tested. Resolution degradation due to small-angle forward scattering was investigated by modeling and use of a computer. An instrument with which to measure the scattering angle distribution in seawater between 0 and 1 degree was devised and built, but the meter had not functioned successfully by the end of this study. Design specifications of instruments with which to predict and compare underwater visibility are set forth. Conclusions and recommendations are submitted. Author
- Test Facilities, Equipment and Methods