Sensor Cable with Transverse Current Electrodes for Marine Surveying
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Solution Overview
Problem
Current electromagnetic surveying technologies face challenges in accurately measuring electric field strengths in subsurface areas, particularly in marine environments, due to limitations in detecting transverse electromagnetic currents and amplifying weak signals effectively.
Innovation Solution
A sensor cable equipped with pairs of current sensor electrodes and amplifiers, disposed along opposite sides, is used to detect and amplify electric currents in transverse electromagnetic fields, allowing for the determination of electric field strengths using the formula E=I/(σS), where E is the electric field strength, I is the measured current, S is the surface area of the electrodes, and σ is seawater conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electromagnetic surveying methods are used, then subsurface imaging can be performed, but measurement precision of electric field strengths is insufficient due to inability to effectively detect and amplify transverse electromagnetic currents
Solution Approach 1:
The patent introduces current sensor electrodes as intermediary elements that convert transverse electromagnetic currents into measurable voltage signals. These electrodes are positioned on opposite sides of the cable to detect currents perpendicular to the cable axis, serving as a mediator between the electromagnetic field and the measurement system.
Solution Approach 2:
The patent replaces conventional voltage sensing mechanisms with current sensing mechanisms. By using current sensor electrodes that detect transverse currents and converting them to voltage signals through an amplifier, the system substitutes traditional electromagnetic field measurement approaches with a current-based measurement system that offers superior precision for transverse field components.
2Reliability
If transverse electromagnetic currents are detected using conventional methods, then some measurement capability is achieved, but signal amplification is insufficient leading to weak signal detection problems
Solution Approach 1:
The patent applies preliminary amplification by placing amplifiers directly at the sensor cable locations where current sensor electrodes are positioned. This preliminary amplification of the weak transverse current signals before transmission to remote processing equipment ensures that weak signals maintain their integrity and can be reliably detected and processed.
3Ease of operation
If stationary receiver units are deployed on the seafloor, then electromagnetic measurements can be taken, but device complexity and deployment difficulty increase
Solution Approach 1:
The patent merges the current sensor electrodes, amplifiers, and data processing capabilities into an integrated sensor cable system that can be easily deployed and towed. This consolidation eliminates the need for separate stationary receiver units with multiple discrete components, significantly simplifying deployment operations while maintaining measurement capabilities.
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 precise measurement and amplification of electric field strengths in marine electromagnetic surveys, improving the accuracy of subsurface imaging by effectively converting measured electric currents into electric field strengths, even in weak signal conditions.
Implementation Method 1
The current sensor electrodes are configured to detect current in an electromagnetic field transverse to an inline direction of the sensor cable
Implementation Method 2
The amplifier is configured to amplify the current in the electromagnetic field for detection by the electrode pair
Implementation Method 3
The electric field strength may be determined according to E=I/(σS), where E is the electric field strength, I is the measured electric current, S is the surface area of the at least one pair of current sensor electrodes and σ is the seawater conductivity
Data Source
AI summary
A sensor cable for surveying. The sensor cable may comprise at least one pair of current sensor electrodes and an amplifier. The current sensor electrodes may be disposed along opposite sides of the sensor cable. The current sensor electrodes may be configured to detect current in an electromagnetic field transverse to an inline direction of the sensor cable. The amplifier may be configured to amplify the current in the electromagnetic field for detection by the electrode pair.