Inductive Coupling via Di/dt Modulation for Subsea Data Integrity
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Solution Overview
Problem
Subsea component communication technologies face challenges with signal corruption due to temperature and age-related drift in inductive coupling, high costs and corrosion issues with wet-matable connectors, and susceptibility to RF interference in far-field communications.
Innovation Solution
The use of near-field magnetic induction using ∂i/∂t circuits with inductive transmission and receive coils, optimized for variable baud rates and protocols like RS-485, and configured for full duplex operation, minimizes external interference and maintains data integrity in harsh environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If far-field RF communication is used, then communication range is extended, but susceptibility to RF interference and signal corruption increases
Solution Approach 1:
The system uses feedback mechanisms where the receiver detects signal quality and adjusts transmission parameters, and the transmitter monitors received signal strength to optimize communication. This feedback loop enables the system to maintain reliable communication by adapting to changing conditions and rejecting interference.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting transmission frequency, power level, and modulation scheme based on channel conditions. The system can switch between different RF parameters to avoid interference and maintain communication quality across varying environmental conditions.
2Reliability
If inductive coupling with carriers and tuned circuits is used, then data transmission is achieved, but drift and signal corruption occur over temperature and age
Solution Approach 1:
The system incorporates frequency tracking and calibration circuits that continuously monitor and adjust carrier frequency to compensate for drift. Feedback loops detect frequency deviations caused by temperature or aging and automatically correct them, maintaining stable communication over the device lifetime.
Solution Approach 2:
The patent uses temperature-compensated oscillators and adjustable frequency synthesis that adapt the carrier frequency based on environmental conditions. By changing operating parameters dynamically, the system compensates for component drift and maintains frequency stability across temperature ranges and aging.
3Reliability
If wet-matable connectors are used, then physical connection is achieved, but cost increases and corrosion issues arise
Solution Approach 1:
The patent replaces mechanical wet-matable connectors with contactless RF inductive coupling. This substitution eliminates physical contact between components, thereby preventing corrosion while maintaining reliable data transmission through electromagnetic field coupling across an air gap.
4Reliability
If wet-matable connectors are used, then physical connection is achieved, but manufacturing cost increases
Solution Approach 1:
The system replaces expensive precision mechanical connectors with simpler RF inductive coupling interfaces. This substitution reduces manufacturing costs by eliminating complex mechanical assemblies, precision machining requirements, and specialized connector components while maintaining connection reliability through contactless coupling.
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 approach provides reliable, high-speed data transmission with immunity to external electrical and RF interference, suitable for a wide range of environments including subsea, while reducing costs and corrosion risks.
Implementation Method 1
near-field magnetic induction using di/dt circuits with inductive transmission and receive coils
Implementation Method 2
hysteresis
Data Source
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AI summary
The disclosed couplers operate in a "near field" mode, meaning energy, whether used to transmit data or power, is transferred through magnetic induction using a di/dt circuit (meaning a change in current over a change in time), such as by using inductive transmission and receive coils in which resistors and/or other components such as diodes are placed into series and/or in parallel with the coils and used to control the shape of the pulse, e.g. its voltage and/or frequency. In an embodiment, one connector comprises a voltage comparator which comprises a hysteresis circuit adapted to be centered at a predetermined no pulse voltage for use in data transmission.