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Title:
METHOD FOR MEASURING TURBIDITY THROUGH BATHYMETRIC LIDAR WAVEFORM ANALYSIS
Document Type and Number:
WIPO Patent Application WO/2018/155788
Kind Code:
A1
Abstract:
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.

Inventors:
WOO JAE-HEUN (KR)
KIM JAE-WAN (KR)
LEE JAE-YONG (KR)
KIM JONG-AHN (KR)
Application Number:
PCT/KR2017/013155
Publication Date:
August 30, 2018
Filing Date:
November 20, 2017
Export Citation:
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Assignee:
KOREA RES INST STANDARDS & SCI (KR)
International Classes:
G01N15/06; G01N15/08; G01N21/47; G01S17/88
Foreign References:
JP2003083895A2003-03-19
US4986655A1991-01-22
Other References:
PAN, Z.: "Water turbidity estimation from airborne hyperspectral imagery and full waveform bathymetric LiDAR", AMERICAN GEOPHYSICAL UNION, FALL MEETING 2015 , SAN FRANCISCO, 14 December 2015 (2015-12-14)
DAVIES-COLLEY, R. J.: "TURBIDITY SUSPENDED SEDIMENT, AND WATER CLARITY: A REVIEW", JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION, vol. 3 7, no. 5, October 2001 (2001-10-01), pages 1085 - 1101, XP055537172
PAN, Z.: "Fusion of LiDAR Orthowaveforms and Hyperspectral Imagery for Shallow River Bathymetry and Turbidity Estimation", IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, vol. 54, no. 7, 5 July 2016 (2016-07-05), pages 4165 - 4177, XP055537176
Attorney, Agent or Firm:
NURY PATENT LAW FIRM (KR)
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