METHOD FOR MEASURING TURBIDITY THROUGH BATHYMETRIC LIDAR WAVEFORM ANALYSIS

摘要

A method for measuring turbidity, according to one embodiment of the present invention, comprises the steps of: providing, underwater and simultaneously, a laser pulsed beam having a first wavelength, which is reflected only from the sea surface, and a laser pulsed beam having a second wavelength, which transmits through the sea surface, reaches the seafloor and is reflected therefrom; collecting, via an optical receiving system, a first optical signal attributable to the water surface-scattering at the sea surface of the laser pulsed beam having the first wavelength, and a second optical signal attributable to the water surface-scattering, the underwater-scattering and the seafloor-scattering of the laser pulsed beam having the second wavelength, and detecting the first optical signal and the second optical signal, respectively, by time according to wavelength; transforming the first optical signal and the second optical signal into a first digital electrical signal and a second digital electrical signal, respectively; generating a first integrated signal by integrating the first digital electrical signal with respect to a predetermined time interval in which a water surface-scattering signal is generated; generating a second integrated signal by integrating the second digital electrical signal with respect to the predetermined time interval in which the water surface-scattering signal is generated; generating a standardized measured integrated signal by dividing the second integrated signal by the first integrated signal; and extracting a measured turbidity corresponding to the standardized measured integrated signal by using a relationship of a standardized theoretical integrated signal based on turbidity predicted using a theoretical value.