Need help from University Of Technology and Saigon Water Supply Corporation (SAWACO) in VietNam

My name is Hien, I’m a student at University Of Technology in VietNam. My team now are doing a project on finding clean water pipelines on rivers and canals in Ho Chi Minh city, VietNam at the request of Saigon Water Supply Corporation (SAWACO).
Now, we are facing with some problems with the robot.

  1. Water in the rivers and canals in my city is muddy so the camera of robot can not see clearly. Therefore, I want to ask HOW MUCH TURBIDITY THE WATER IS SO THAT THE CAMERA CAN SEE CLEARLY? and CAN LIGHT BRIGHTNESS IMPROVE CAMERA CLARITY?
    ( Can you give me the parameters and data about cameras and lights for me? )
  2. Besides, I want to ask how long after using the rubber gasket in the robot should be replaced and I need the exact parameter of the rubber gasket to buy the new ones to replace.
  3. I would like to ask how much weight the robot can carry when dropped in strong currents and what is the maximum flow the robot can withstand


Interesting application! :slight_smile:

We haven’t done any kind of calibrated measurement comparing visibility distance/clarity with water turbidity. By definition highly turbid water will be challenging or even impossible to see far in, but since turbidity is a scale there’s no single answer as to what level of turbidity still allows “clear” visibility - it’s instead a question of what level of turbidity is still clear enough, which is dependent on your application.

That depends what you mean. In completely clear water (with zero turbidity) more light directly correlates with further visibility, although nearby objects may get over exposed when the light is bright.

Turbidity is caused by particulate matter in the water, which reflects / spreads light away from its travel direction. If you add lights beside the camera then increasing the brightness can reduce visibility by causing overly bright reflections from the particles in the water, which saturate the camera pixels and prevent visibility of objects further away.

Adding lights externally to / away from the camera system may increase visibility, although it can create a saturated pixel region if the light source is pointing directly at the camera, or if the light is strong in very turbid water (or shining onto objects very close to the camera)

The technical specifications that we have determined/designed for our products are available on the relevant product pages, in the “Technical Details” sections. Here are the pages for our Low-Light HD USB Camera and Lumen Subsea Light :slight_smile:

There are a variety of O-rings in our vehicles, in different components. In general we’ve found that our compression seals degrade most when repeatedly pressure-cycled, so if you’re regularly opening and closing an enclosure, or doing very deep dives and coming back up, the seals will need to be replaced sooner than if the enclosure is mostly kept closed, and dives are infrequent and/or quite shallow.

The maintenance section of our Enclosure Usage Guide may be of interest here :slight_smile:

Carrying capacity and travel speed through the water depend on the vehicle being used, as well as its orientation, and the density of the water it’s being operated in. At low voltages thrust output is lower (including as the battery drains throughout operation), and in some orientations a vehicle may have additional thrust available (based on its thruster orientations) and/or additional drag. Salty water is more dense than fresh water, so the vehicle is more buoyant and has a higher carrying capacity.

Our standard BlueROV2 is specified as having a maximum forward speed of 1.5m/s, for what that is worth. The heavy configuration has four vertical thrusters (instead of two for the standard), so has twice the vertical thrust capacity of the standard configuration (although that does not guarantee exactly twice the carrying capacity, because that’s partially dependent on the net buoyancy of each vehicle, which depends on the installed ballast and the water being operated in).