Underwater Optical Communication - FEUP

Underwater Optical Communication:

An Approach Based on LED

Bernardo Miguel Carvalho Silva

o Supervisor: Nuno Alexandre Cruz

o Co-Supervisors: José Carlos Alves, Dr. Luís Manuel Pessoa (INESC TEC)

• Objectives

• Context

• System Design

• Implementation

• Test and Results

• Conclusions

• Future Work

Outline

Assembly of a LED and photo-sensor based test system

• Creation of a underwater wireless link that enables the transmission of information

• Create a system that enables the test of different transmission parameters

Create a real-life solution

• Create a solution that could be used in a robotic platform

Test the system in different environments

• Laboratory Tests

• Laboratory Pool Tests

• Apply different external condition in the performance

ObjectivesObjectives Context System Design Implementation

Tests and Results

Conclusions Future Work

Difficulties:

• Radio communication is highly attenuated underwater

• Sonar transmissions are typically used in this application

• Underwater wireless transmission is a challenging task

Advantages:

• Certain gaps in the electromagnetic spectrum have low attenuation

• It can reach high data-rates with small latency

• Possible solution for short range communications

ContextObjectives Context System Design Implementation

Tests and Results

System DesignObjectives Context System Design Implementation

Tests and Results

Preliminary system design

System DesignObjectives Context System Design Implementation

Tests and Results

Final system design

Design Constrains:

• Small size;

• Low weight; and

• Low complexity.

System Design

Design Requirements:

• Maximum range;

• High data-rate; and

• Low power.

Objectives Context System Design ImplementationTests and Results

Optical Transmitter – Tx

Optical Receiver – Rx

Physical Casing

Proposed Prototype

ImplementationObjectives Context System Design Implementation

Tests and Results

• Light Source and Light Source Driver:

‒ Focusing Lens

‒ 7 LEDs MCPCB

‒ MOSFET

‒ MOSFET Driver

Tests and Results

• Light Source and Light Source Driver:

‒ Focusing Lens

‒ 7 LEDs MCPCB

‒ MOSFET

‒ MOSFET Driver

Tests and Results

• Photo-Receiver

‒ Blue/Green Enhanced Photodiodes

• Current-to-voltage converter

‒ Transimpedance Amplifier

• Buffer

Tests and Results

• Amplification and filtration

‒ Band pass filter

• Digital output

‒ Comparator

Tests and Results

Physical Casing

Tests and Results

Proposed Prototype

• Configurable solution

‒ Layer design

• Usable in a autonomous underwater robotic platform

Tests and Results

Proposed Prototype

Tests and Results

Test Platform

• Align the pair transmitter/receiver

• Estimate the range of the transmission

• Change the orientation of the modules

Tests and Results

Laboratory “Control” Tests

• Check if the basic internal concept works

Laboratory Workbench Tests

• Check if the module with the casing works

Laboratory Pool Tests

• Prove that the concept fulfils the basic objectives

Tests and ResultsObjectives Context System Design Implementation

Tests and Results

• Maximum range

• Influence of the external lights

• Performance of the focusing

Preliminary Conclusions

• The power consumption in

order of the range behaves like

an exponential;

• The blue transmission

outperforms the green

transmission; and

• The focusing lens enhances

the range of the link.

Tests and Results

• Maximum range

• Influence of the deviation

• Behaviour of each casing type

Conclusions

• The power consumption in order

of the range behaves like an

exponential;

transmission; and

• The deviation of 15 degrees high

enhances the transmission.

Tests and Results

• Maximum range

• Influence of the deviation

Conclusions

• The power consumption in order

of the range behaves like an

exponential;

transmission; and

• The deviation of 15 degrees high

enhances the transmission.

Tests and Results

The main objectives were

accomplished

A experimental system was

created, implemented and

tested in real life conditions

Vast possibilities for future

ConclusionsObjectives Context System Design Implementation

Tests and Results

Possible upgrades to the hardware can be implemented

The layer based system enables the test of different modules for

transmitting and receiving information

The test platform can also suffer an upgrade

New case studies can be proposed based on this system

Future WorkObjectives Context System Design Implementation

Tests and Results

Thanks for your attention!

Obrigado pela vossa atenção!

Underwater Optical Communication - FEUP

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