Capacitive Oil Sensor Assembly with Absorbing Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional oil sensors are complex, unable to distinguish between oil and water, and are inconvenient to attach to surfaces where oil detection is needed.
Innovation Solution
A capacitive oil sensor assembly comprising a main body with conductive pads, an oil-absorbing and water-repelling material layer, and an electrically conductive layer, which absorbs oil and changes capacitance to detect its presence, allowing for differentiation between oil and water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional oil sensors (laser nephelometers, UV radiation detectors) are used, then oil detection capability is achieved, but device complexity increases and ability to distinguish between oil and water is lost
Solution Approach 1:
The patent replaces complex optical detection systems (laser nephelometers, UV radiation detectors) with a simple capacitive sensor system. The capacitive sensor uses electrical fields and capacitance measurements instead of optical components, dramatically simplifying the device structure while maintaining oil detection capability. The sensor consists of basic electrical components (capacitive electrodes, signal processing circuitry) rather than complex optical instruments.
Solution Approach 2:
The patent changes the detection parameter from optical properties (light scattering, UV radiation emission) to electrical properties (capacitance). By measuring capacitance changes in response to oil presence, the system achieves both simplified structure and improved ability to distinguish between oil and water, as different materials have distinct dielectric properties that affect capacitance differently.
2Measurement precision
If conventional oil sensors are used, then oil detection is achieved, but ease of attachment to surfaces deteriorates
Solution Approach 1:
The capacitive sensor can be implemented as a thin, flexible component that can be easily attached to various surfaces where oil detection is needed. The sensor structure allows for integration into different geometries and surfaces, providing both accurate oil detection and ease of installation compared to bulky conventional optical sensors.
3Measurement precision
If conventional oil sensors are used, then oil presence detection is achieved, but ability to distinguish between oil and water deteriorates
Solution Approach 1:
The patent uses capacitance measurement to detect oil presence while simultaneously enabling material differentiation. Different materials (oil, water, other liquids) have distinct dielectric properties that produce characteristic capacitance values. By measuring capacitance, the system retains the ability to distinguish between oil and water, unlike conventional optical sensors that cannot differentiate between these materials.
Solution Approach 2:
The replacement of optical detection with capacitive detection provides both simplified structure and improved material differentiation capability, as electrical field interactions with different materials provide distinctive signatures for identification.
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 capacitive oil sensor assembly effectively detects oil presence and differentiation from water, providing a simpler and more convenient solution for oil detection on various surfaces.
Implementation Method 1
a first layer made of an oil-absorbing and water-repelling material, the first layer arranged between the electrically conductive layer and the main body
Implementation Method 2
a processing unit configured to measure a capacitance between the first conductive pad and the conductive reference pad area
Implementation Method 3
The absorption of oil in the first layer will change the permittivity of the first layer, which will be observed as a change in capacitance by the processing unit
Data Source
AI summary
A capacitive oil sensor assembly includes: a main body; a first conductive pad disposed on, or embedded in, the main body; and a conductive reference pad area, disposed on, or embedded in, the main body. The conductive reference pad area is connected to a ground or reference point. A gap or isolation layer separates the first conductive pad and the conductive reference pad area. The sensor assembly also includes: an electrically conductive layer; a first layer made of an oil-absorbing material, the first layer arranged between the electrically conductive layer and the main body, covering the first conductive pad and the conductive reference pad area; and a processing unit configured to measure a capacitance between the first conductive pad and the conductive reference pad area. A method of detecting oil using a capacitive oil sensor assembly is disclosed.