Optical-Acoustic Sonar for detection of Submarines from Airborne Assets

[Forest Green]

https://twitter.com/x/status/1596857511415406592

View: https://twitter.com/SubBrief/status/1596857511415406592

 

[Forest Green]

Interesting facts on laser propagation in water too.

Laser Makes Big Bangs Underwater

Technologies that use underwater acoustics -- for sonar, communications, or navigation -- often require a piece of hardware in the water to create sound remotely. Physicists are working on ways to use flashes of laser light instead.

www.sciencedaily.com

http://downloads2.esri.com/ESRIpress/images/169/OGLOBE_ch01.pdf

Lidar data can extend to about 230 feet (70 meters) water depth, depending on the water clarity.

 

[BAROBA]

So there is currently no way to detect a submarine from a plane? Everything has to be in the water to be able to detect a submarine? Asking for a friend

 

[Forest Green]

So there is currently no way to detect a submarine from a plane? Everything has to be in the water to be able to detect a submarine? Asking for a friend

Yes there maybe, is what this is saying.

Opto-acoustic underwater remote sensing (OAURS) - an optical sonar?

We introduce a new technique for bathymetry in turbid water, which consists of a remotely delivered opto-acoustic pulse to the water surface and interferometric detection of the reflected acoustic wave at the water surface. We discuss theoretical models and experimental results for the...

ieeexplore.ieee.org

https://www.researchgate.net/figure/Schematic-of-proposed-airborne-sonar-system-with-the-exciting-laser-and-receiving_fig1_346257462

 

[Banana Liney]

First post here, so apologies if I don't know all the etiquette.

LIDAR has been used to survey seabeds for a good few years now, I applied for a job with one of the Aussie companies.

From the descriptions above, you could use LIDAR to detect submarines by detecting "targets" that are under the water but not on the sea bottom, but for that you would need a three dimensional model of the area under the water that would allow you to compare "now" with "then", which would take a lot of computing time.

The second image seems to be a system for "reading" the waves to detect noise made by submarines, but this would be very noisy in terms of picking out any weak audio signals from the general background noise.

Sounds great, but you would be better off with a dipping passive sonar