Coating Detection System for Glass Using Optical and Capacitive Sensors
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Solution Overview
Problem
Current methods for detecting coatings on transparent or semi-transparent materials, such as glass, are inadequate for distinguishing between non-conductive and conductive coatings, particularly in architectural applications where incorrect placement can lead to heat buildup and premature seal failure, and existing methods are either unreliable or risk damaging the coating.
Innovation Solution
A system combining a conductive sensor and a light reflection sensor to determine the presence, location, and type of coatings on transparent or semi-transparent media, capable of operating in contact or non-contact modes, using IR laser light and capacitive or inductive sensing to differentiate between conductive and non-conductive coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical reflection method is used to detect non-conductive coating, then coating presence can be detected, but it cannot reliably distinguish between non-conductive and conductive coatings
Solution Approach 1:
The patent combines optical reflection sensing and capacitive/inductive sensing into a single integrated detection system. The optical sensor detects coating presence through reflection characteristics, while the capacitive/inductive sensor determines conductivity through electrical field interaction. By merging these two sensing modalities, the system achieves both coating detection and type differentiation simultaneously.
Solution Approach 2:
The detection system is designed to perform multiple functions: detecting coating presence, determining coating location (which side of glass), and identifying coating type (conductive vs. non-conductive). This multi-functional approach eliminates the need for separate detection methods for each property, resolving the limitation of single-method systems.
2Measurement precision
If capacitance method is used to detect conductive coating, then coating presence can be detected, but it cannot reliably detect surface location of the coating
Solution Approach 1:
The system merges optical reflection sensing with capacitive sensing. The optical sensor provides surface location information by detecting reflections from specific glass surfaces, while the capacitive sensor provides conductivity information. This combination ensures both coating presence and location are reliably detected.
3Measurement precision
If continuity test device is used to detect coating, then coating conductivity can be tested, but the device must touch the coating which can damage it
Solution Approach 1:
The patent replaces mechanical contact-based continuity testing with non-contact capacitive or inductive sensing. The capacitive/inductive sensor detects coating conductivity through electrical field interaction without physical contact, eliminating the risk of coating damage while maintaining measurement accuracy.
4Device complexity
If single detection method is used, then device complexity is low, but it cannot reliably detect both conductive and non-conductive coatings with location information
Solution Approach 1:
The system integrates optical reflection sensing and capacitive/inductive sensing into a unified detection platform. This merging allows simultaneous detection of coating presence, location, and type using a single device, achieving high reliability without proportionally increasing complexity.
Solution Approach 2:
The detection system is designed as a universal device capable of detecting both conductive and non-conductive coatings, determining their location on glass surfaces, and providing orientation information. This multi-functionality in a single system resolves the limitations of specialized single-method devices.
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 reliably detects and differentiates between conductive and non-conductive coatings, ensuring correct placement and reducing the risk of heat buildup by accurately identifying coating types and locations without damaging the coatings.
Implementation Method 1
an optical reflection method where light is emitted onto and reflected from the coated surface. The amount of light energy reflected from a non-conductive coated surface is different from a clear or uncoated surface.
Implementation Method 2
A system combining a conductive sensor and a light reflection sensor to determine the presence, location, and type of coatings on transparent or semi-transparent media, capable of operating in contact or non-contact modes, using IR laser light and capacitive or inductive sensing
Implementation Method 3
using IR laser light and capacitive or inductive sensing to differentiate between conductive and non-conductive coatings
Data Source
AI summary
A system for detecting coatings on a transparent or semi-transparent medium includes a conductive sensor and a light reflection sensor which are configured to determine a presence and the conductivity of the coating on the medium.