| 摘要 |
A method and a device for removing green algae using ultrasonic waves are provided to obtain the maximum efficiency by operating ultrasonic oscillators at resonance frequency, obtain a wide effective area by installing ultrasonic oscillators in parallel and reduce unnecessary power consumption by reducing ultrasonic output time in case of few plankton microorganisms. A method for removing plankton using ultrasonic waves comprises the steps of: outputting ultrasonic waves for measuring density of plankton microorganisms to the plankton microorganisms; receiving a signal intensity of a reflection sound reflected from the plankton microorganisms by an ultrasonic wave receiving sensor; and driving ultrasonic oscillators according to the received signal of the reflection sound to output ultrasonic waves at a frequency at which the signal intensity of the reflection sound becomes the maximum. The reflection sound has an ultrasonic frequency at which a background noise becomes the maximum. |
