Capacitive Array Sensor for Floating Oil Thickness Measurement

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Solution Overview

Problem

Existing methods for measuring floating oil thickness are often expensive, inaccurate, sensitive to environmental conditions, and lack continuous monitoring capabilities, particularly when used in open water environments.

Innovation Solution

A capacitive array sensor system that measures the thickness of floating fluids by detecting the dielectric constant differences between air, oil, and water using a capacitive array with conductive plates and a processing unit, allowing for real-time, continuous monitoring without requiring calibration for different oil types.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If remote measurement techniques (visual methods, hyperspectral imaging, radar, thermal imaging) are used to assess oil thickness, then a global assessment of thickness can be obtained, but the measurements are highly affected by lighting and atmospheric conditions, are expensive, or cannot be conducted continuously

Engineering Contradiction:

Improvecoverage areaVSAvoidmeasurement reliability

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The patent replaces remote optical/mechanical measurement systems with an electrical field-based capacitive sensing system. The capacitive sensor uses electrical fields to detect dielectric constant changes in the oil layer, eliminating dependence on lighting and atmospheric conditions while enabling continuous monitoring at a specific location.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a dielectric constant-based intermediary measurement approach. Instead of directly measuring oil thickness through optical or mechanical means, the system measures the dielectric constant of the oil layer, which serves as an intermediary property that correlates with thickness, thereby avoiding the limitations of direct remote sensing methods.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If contact-based methods (conductivity, capacitance, light arrays, electromagnetic, vision sensors) are used to measure oil thickness, then localized and continuous measurements can be provided, but the sensors suffer from inaccuracies, sensitivity to lighting conditions, oil type, environmental conditions, fouling effects, and wave conditions

Engineering Contradiction:

Improvecontinuous monitoring capabilityVSAvoidmeasurement accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent changes the measurement parameter from direct thickness measurement to dielectric constant measurement. By measuring the dielectric constant (a fundamental material property) and using it to infer thickness, the system achieves greater accuracy and reduced sensitivity to environmental variations, fouling, and wave conditions compared to traditional contact-based sensors.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The capacitive sensor system is designed to be universal across different oil types without requiring recalibration. The dielectric constant measurement approach inherently adapts to different oil compositions, making the system universally applicable to various oil spills while maintaining measurement precision and continuous monitoring capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If traditional capacitive sensors are used for oil detection, then they can provide continuous monitoring, but they require calibration for different oil types and are sensitive to environmental conditions and fouling effects

Engineering Contradiction:

Improvecontinuous monitoring capabilityVSAvoidcalibration requirements

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent measures the dielectric constant (a fundamental material property) rather than directly measuring thickness. This parameter change enables the system to adapt to different oil types automatically without recalibration, as the dielectric constant inherently characterizes the oil composition. The system uses the dielectric constant as an intermediary to calculate thickness, eliminating the need for oil-type-specific calibration.

Inventive Principle:

Principle #35Parameter changes

4Productivity

If sensors are deployed in open water environments, then continuous monitoring is possible, but the sensors require special mounting or floating platforms which increase device complexity and cost

Engineering Contradiction:

Improvecontinuous monitoring capabilityVSAvoidmounting platform requirements

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical mounting platforms with a simplified electrical field-based sensing approach. The capacitive sensor can be deployed directly in the water column without requiring floating platforms or specialized mounting structures, as it measures dielectric properties through electrical field interaction with the oil layer, eliminating the need for mechanical support systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

The system provides accurate, continuous measurements of oil thickness in dynamic conditions, reducing fouling effects and environmental sensitivity, and can operate in open water environments without the need for special mounting or floating platforms.

Implementation Method 1

thickness measurement device based on a capacitive array... By measuring the change in capacitance between strips of the array, the floating liquid thickness measurement device identifies the air/oil interface and the oil/water interface

Methodology Applied

Scientific EffectCapacitance: Capacitance