PURPOSE: To prevent the generation of various troubles such as the reduction of an intake amount, the lowering of the efficiency of a heat exchanger or a pump, the damage thereof or the like by irradiating mecroorganisms, fine algae or the like causing slime suspended in water with excimer laser in a water pipe.
CONSTITUTION: The aquatic organism-containing seawater in an irradiation pipe is irradiated with a laser beam 9 from an excimer laser transmitter 8 in a water stream direction. An excimer laser composed of XeCl (308nm) is used and the adhesion amounts of slime of three monitor pipes 12 of a discharge pipe 4 are measured. As a result, the adhesion amount of slime on a short wavelength side is effectively low. Therefore, by using an excimer laser having a wide wavelength region as laser and setting the wavelength of the laser to a specific value, damage effect such as killing effect which can be said to be peculiar can be imparted to microorganisms and fine algae causing slime suspended in water.
TOMINAGA SHINICHI
ONIZUKA SHIGENORI
HAYASHI KINGO
HITACHI SHIPBUILDING ENG CO
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