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Underwater Optical Communication Semester Project

Underwater Optical Communication Semester Project. López Estepa, Pedro Assistant: Konstantinos Karakasiliotis Professor: Auke Jan Ijspeert Final presentation 13 January 2009. Summary . Goals Initial Problems Wireless Communication Technologies Designed System Experiments Conclusions

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Underwater Optical Communication Semester Project

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  1. Underwater Optical CommunicationSemester Project López Estepa, Pedro Assistant: Konstantinos Karakasiliotis Professor: Auke Jan Ijspeert Final presentation 13 January 2009

  2. Summary • Goals • Initial Problems • Wireless Communication Technologies • Designed System • Experiments • Conclusions • Future work Underwater Optical Communication - Pedro López Estepa

  3. accompanying vehicle control Radio video and data [receiver] Blue light [transmitter] Goals Project Description Underwater Optical Communication - Pedro López Estepa

  4. Goals Goals of the Project • Develop a communication system to transmit video between underwater robot and surface platform • Decrease size due to space restrictions. • Find a good combination of communication speed and robustness. Underwater Optical Communication - Pedro López Estepa

  5. Initial Problem Initial Problem • Most of the current underwater optical communication systems can be clasified in two groups in terms of their limitations. • Size Limitations • Power Limitations • We are not included in only one of them! Optical Communication System Size Limitations Power Limitations Underwater Optical Communication - Pedro López Estepa

  6. Wireless Communication Technologies31.09.2008 – 16.10.2008 • High frequency radio wave is highly absorbed in water. • Acoustic communication systems are relatively low bandwidth. • Optical communication with LASER is monidirectional. • Optical communication in Visible Spectrum • Omnidirectional • Bandwidth up to some MHz • Minimal light absorption in water is usually achieved for blue light around 400-450 nm. • Felix Schill , Uwe R. Zimmer , and Jochen Trupf. “Visible Spectrum Optical Communication and Distance Sensing For Uncerwater Applications”. The Australian National University, ACT 0200. Underwater Optical Communication - Pedro López Estepa

  7. Designed System 16.10.2008 – 20.12.2008 System Designed 16.10.2008 – 20.12.2008 TX Water RX Video signal LED Driver Modulation XOR LED CLK Vdd GND Lens Demodulated signal Vdd Demodulation Filtering Amplification Photodiode GND Underwater Optical Communication - Pedro López Estepa

  8. Designed System 16.10.2008 – 20.12.2008 Transmitter LED Driver Modulation XOR Underwater Optical Communication - Pedro López Estepa

  9. Designed System 16.10.2008 – 20.12.2008 Transmitter Underwater Optical Communication - Pedro López Estepa

  10. Designed System 16.10.2008 – 20.12.2008 Transmitter LUXEON III Blue 700 mA - 3W Underwater Optical Communication - Pedro López Estepa

  11. Designed System 16.10.2008 – 20.12.2008 Receiver Signal Treatment Amplification Filtering Underwater Optical Communication - Pedro López Estepa

  12. Designed System 16.10.2008 – 20.12.2008 Receiver Underwater Optical Communication - Pedro López Estepa

  13. Experiments20.12.2008-09.12.2009 Air experiments Underwater Optical Communication - Pedro López Estepa

  14. Experiments20.12.2008-09.12.2009 Air experiments Underwater Optical Communication - Pedro López Estepa

  15. Experiments20.12.2008-09.12.2009 Underwater experiments-Hardware Setup Underwater Optical Communication - Pedro López Estepa

  16. Experiments20.12.2008-09.12.2009 Underwater experiments Underwater Optical Communication - Pedro López Estepa

  17. Experiments20.12.2008-09.12.2009 Underwater experiments Underwater Optical Communication - Pedro López Estepa

  18. Experiments20.12.2008-09.12.2009 Underwater experiments Underwater Optical Communication - Pedro López Estepa

  19. Conclusions • The experiments have shown that the range is not decreased while working in underwater • The wide angular coverage of 30º, due to the used lens, doesn’t allow more than 10 cm range around the perpendicular point of movement • To obtain omnidirectional coverage it’s necessary to include an improved lens system in the receiver with several photo diodes to increase the detection range Underwater Optical Communication - Pedro López Estepa

  20. Conclusions • It’s necessary to try to decrease the power consumption after the lenses analysis is finished. • The experiments show that the system has a good response in the range of 500 kHz to 1.50 MHz, which could be increased to 2 MHz by using a better lens system. • According to the initial project requirements • We have completed the electronic hardware fabrication, which means, design and build the physical layer for an underwater communication system. • Even if we didn’t manage to get the transmitter underwater, the setup we used resembles in a good way the final one. • A systematic analysis to determine the most efficient lenses system is not completed. Underwater Optical Communication - Pedro López Estepa

  21. W. Communication technologies Communication type selection Preliminary experiments Fast optical communications Time Trasmitter design Transmitter build Receiver design Receiver build Air experiments Underwater experiments Improvements Time Frame Completed task Actual task Underwater Optical Communication - Pedro López Estepa

  22. Future work Improvements • Analyze and improve lenses system • High Frequency amplification in receiver • PCB Reduce • Build platform • Enchance harware for underwater emplacenment • Implement Software demodulation • … Underwater Optical Communication - Pedro López Estepa

  23. Questions Underwater Optical Communication - Pedro López Estepa

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