Underwater Optical Communication Network for Sensor Data Transmission
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Solution Overview
Problem
Underwater acoustic communication networks face limitations such as multipath effects, slow propagation speed, transmission latency, distortion, high bit error rates, and limited bandwidth, which are not effectively addressed by existing technologies.
Innovation Solution
An underwater wireless communication network utilizing optical communication between self-powered sensor nodes, with a buoyant platform and underwater sensor nodes equipped with optical transceivers, ambient energy collectors, and acoustic positioning systems, allowing for efficient data transmission via wired and radio-frequency connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If acoustic communication is used for underwater wireless sensor networks, then the network can be established and communicate, but the propagation speed is slow (around 1500 m/s) and transmission latency is large
Solution Approach 1:
The patent replaces acoustic communication (mechanical wave propagation) with optical communication (electromagnetic wave propagation). Optical signals travel much faster in water than acoustic signals, eliminating the slow propagation speed and large transmission latency inherent in acoustic systems. This substitution fundamentally changes the communication medium from sound waves to light waves, achieving the desired speed improvement.
2Productivity
If acoustic communication is used, then communication can be established, but the bandwidth is limited due to absorption loss at higher frequencies
Solution Approach 1:
The patent substitutes acoustic communication with optical communication to overcome bandwidth limitations. Optical communication provides significantly wider bandwidth capabilities compared to acoustic communication, enabling high-rate data transmission without the frequency-dependent absorption losses that constrain acoustic systems.
3Reliability
If acoustic communication is used, then communication can occur, but the amplitude and phase of received signals are easily distorted causing high bit error rate
Solution Approach 1:
The patent replaces acoustic communication with optical communication to eliminate signal distortion problems. Optical signals are not subject to the same multipath effects, refraction, and background noise that plague acoustic communication in underwater environments, resulting in superior signal quality and lower bit error rates.
4Ease of operation
If TDMA MAC protocol is used for optical communication, then node identification and communication can be achieved, but additional processing increases electrical load requiring frequent battery replacement
Solution Approach 1:
The patent implements a self-service mechanism where sensor nodes harvest ambient energy from the water environment (thermal, kinetic, or chemical energy) to power their operations. This eliminates or reduces the need for battery replacement by enabling nodes to self-power themselves, directly addressing the energy consumption problem caused by TDMA MAC protocol processing.
Solution Approach 2:
The patent integrates multiple communication modes (acoustic for positioning and optical for data transmission) and multiple power sources (batteries and ambient energy harvesters) into a unified system. This multi-functional approach allows the network to leverage the strengths of each component while mitigating their individual weaknesses, particularly the energy consumption issue.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables reliable and efficient data transmission with reduced latency and increased bandwidth, eliminating the need for frequent battery replacements and minimizing interference, thus enhancing the operational autonomy of underwater sensor networks.
Implementation Method 1
underwater wireless communication network that uses optical communication among self-powered underwater sensor nodes
Implementation Method 2
acoustic positioning system
Implementation Method 3
ambient energy collector configured to power the first buoyant platform or the first underwater sensor node
Data Source
AI summary
An underwater wireless communication network includes a first buoyant platform, including a radio-frequency communication transceiver and a wired communication transceiver, floating at a surface of a body of water. A first underwater sensor node is coupled to the first buoyant platform by at least one wire over which the first buoyant platform and the first underwater sensor node communicate. The first underwater sensor includes a wired communication transceiver to communicate with the first buoyant platform over the at least one wire. The first buoyant platform or the first underwater sensor node includes a first ambient energy collector configured to power the first buoyant platform or the first underwater sensor node. A second underwater sensor node, arranged under the body of water, includes a second ambient energy collector configured to power the second underwater sensor node. The first and second underwater sensor nodes each comprise a sensor, an optical communication transceiver, and an acoustic positioning system.