Patent AU-2021104960-A4 (AU)
Title: Method and System for Measuring Water Transparency
Inventor: WANG XIAOYONG
IPC: G01N21/59
Filed: 2021-08-05
Granted: 2021-09-30
Abstract: The embodiments of the present disclosure provide a method and system for measuring water 
transparency. The method includes: identifying information of a sinking Secchi disk to acquire 
Secchi disk identification data, recording real time at a moment before a just disappearance of the 
sinking Secchi disk and real time at the just disappearance, determining a Secchi disk identification 
result according to the Secchi disk identification data, performing time matching according to the 
Secchi disk identification result and water depth information recorded by a depth measurement 
component in real time, and taking water depth information corresponding to a time matching result 
as a water transparency measurement result. A camera identification component, the depth 
measurement component, the Secchi disk, and a clump weight are connected to a switch, the switch 
is connected to an industrial control computer, and the Secchi disk identification data acquired by 
the camera identification component and the water depth data acquired by the depth measurement 
component are transmitted to the industrial control computer through the switch. The embodiments 
of the present disclosure change the convention measurement that is made with the determination of 
naked eyes and the reading on a graduation cord, and greatly improve the efficiency and accuracy 
for measuring the transparency.
1/4 
DRAWINGS 
Identify information of a sinking Secchi disk to acquire Secchi disk identification data, Si 
and record real time T1 at a moment before disappearance of the sinking Secchi disk and 
real time T2 of the disappearance 
Determine a Secchi disk identification result according to whether the identification data is present in the 
real time T Iat the moment before the disappearance of the sinking Secchi disk and the real time T2 of the 
disappearance, a time interval T2-Ti of the identification data, preset fixed time ti and whether the Secchi 
disk can be identified within the preset fixed time tI 
Determine, when the identification data is present in the real time T Iat the moment 
before the disappearance of the sinking Secchi disk and the real time T2 of the 
disappearance and T2-T1>0, and if the time interval T2-Ti of the identification data is 
less than the preset fixed time ti, and the Secchi disk cannot be identified again within a S2a 
fixed time interval t2 after the disappearance of the sinking Secchi disk, that the sinking 
Secchi disk is identified successfully; and take the TI or the T2 as the Secchi disk 
identification result, perform the time matching on the Secchi disk identification result 
and the water depth information h recorded by the depth measurement component in real 
time, and take water depth information h matching with the Secchi disk identification 
result and recorded by the depth measurement component as the water transparency 
measurement result 
Determine, when the identification data is present in the real time T Iat the moment before 
the disappearance of the sinking Secchi disk and the real time T2 of the disappearance and 
T2-TI>O, and if the time interval T2-Ti of the identification data is less than the preset 
fixed time ti, and the Secchi disk is identified again within a fixed time interval t2 after the 
disappearance of the sinking Secchi disk, that the sinking Secchi disk is identified S2 
unsuccessfully; continuously identify the sinking Secchi disk, and update a value for each 
of the real time T Iat the moment before the disappearance of the sinking Secchi disk and S2b 
the real time T2 of the disappearance, until meeting that the Secchi disk cannot be 
identified again within the fixed time interval t2 after the disappearance of the sinking 
Secchi disk, and determining that the sinking Secchi disk is identified successfully; and 
take the updated real time TI or real time T2 as the Secchi disk identification result, 
perform the time matching on the Secchi disk identification result and the water depth 
information h recorded by the depth measurement component in real time, and take water 
depth information h matching with the Secchi disk identification result and recorded by the 
depth measurement component as the water transparency measurement result 
Determine, when the identification data is present in the real time Ti at the moment 
before the disappearance of the sinking Secchi disk and the real time T2 of the 
disappearance, and if the time interval T2-T Iof the identification data is more than the 
preset fixed time ti or T2-TI<O, that the sinking Secchi disk is identified unsuccessfully; 
continuously identify the sinking Secchi disk, and update a value for each of the real time 
T Iat the moment before the disappearance of the sinking Secchi disk and the real time S2c 
T2 of the disappearance, until meeting that the Secchi disk cannot be identified again 
within a fixed time interval t2 after the disappearance of the sinking Secchi disk, and 
determining that the sinking Secchi disk is identified successfully; and take the updated 
real time T Ior real time T2 as the Secchi disk identification result, perform the time 
matching on the Secchi disk identification result and the water depth information h 
recorded by the depth measurement component in real time, and take water depth 
information h matching with the Secchi disk identification result and recorded by the 
depth measurement component as the water transparency measurement result.  
Record, in real time by using a depth measurement component, water depth information h 
on where the sinking Secchi disk is located, perform time matching according to the S3 
Secchi disk identification result and the water depth information h recorded by the depth 
measurement component in real time, and take water depth information h matching with 
the Secchi disk identification result and recorded by the depth measurement component 
as a water transparency measurement result 
FIG. 1