Accession Number : AD0602289

Title :   EFFECT OF ULTRASONICS ON LIMNORIA,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Hochman,Harry

Report Date : 03 APR 1964

Pagination or Media Count : 14

Abstract : The effects of ultrasonic vibrations on marine borers was investigated. A cursory examination of the effects of these vibrations on the test animal, Limnoria tripunctate, at two frequency ranges revealed that (a) the test animals were killed in the 40 kc range when they were close to the transducer, i.e., at high energy levels and (b) the 350-400 kc range, whose half wavelength was of the same order of magnitude as the test animal, was much less effective. The rate of loss of effectiveness with distance from the transducer, even at 40 kc, was so great that the use of ultrasonics to control marine borers would require tremendous amounts of power and would be uneconomical when compared with other methods of wood preservation. (Author)

Descriptors :   (*MARINE BORERS, ULTRASONIC RADIATION), SOUND TRANSMISSION, UNDERWATER SOUND, MARINE BIOLOGY, AQUATIC ANIMALS, TRANSDUCERS, OSCILLOSCOPES, VOLTMETERS, HIGH FREQUENCY, POWER AMPLIFIERS, INTENSITY, VELOCITY, ACCELERATION, PRESSURE, PEST CONTROL, WOOD

Distribution Statement : APPROVED FOR PUBLIC RELEASE