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An airborne photoacoustic imaging system developed at Stanford University could aid in biological marine surveys and the search for sunken ships. The device is able to break through the threshold between air and water, which had previously been a barrier to aerial survey.
Techniques such as radar and lidar have proven useful for surveying land. Due to absorption, though, they do not support marine survey. Sonar has instead been the method of choice for the application, though a device reliant on that technology must be submerged, in a process that can slow, expensive, and inefficient. Sound waves are unable to pass from air into water without losing the majority of their energy to reflection, and returning sound waves experience…READ MORE