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Some underwater targets can give off regular sound wave. When the pressure change due to underwater acoustic signal fluctuation transmitting to the water surface, it may cause slight disturbance at the interface between water and the air, which means that the reflected laser beam carries the information of the underwater acoustic signal since the corresponding laser beam has been modulated. Some necessary...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.