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Abstract
A feasibility investigation of the deployment of a pulsed blue-green laser as an airborne bathymetric sensor for near-shore beach reconnaissance has been performed. Preliminary transmission measurements were made in a water tank using AVCO Corporation's new high-powered 3-nsec pulsed neon laser. These results were used in the design of the airborne tests. The laser transmitter/receiver system was installed in a Turbo Commander and flown over the shores of Lake Ontario. Water depths up to 26 ft were recorded. The maximum depth capability, which is determined by the turbidity of the water, is limited in the present system to approximately four attenuation lengths at a platform altitude of 500 ft. In fairly clear water ( α = 0.1 m −1) this amounts to a depth-measuring capability of 120 ft. The shallow water resolution is ± 1.5 ft. An operational system employing a high-power high-pulse rate laser (100–1000 pps) could operate from either a helicopter or a high-performance aircraft and sweep out a broad area coverage. An aircraft flying at 300 miles/hr could obtain data points every 20 ft over an area of 5–50 sq miles/hr.
Published Version
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