Same-Side Drop Analysis System for Coating Applicators
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Solution Overview
Problem
Existing drop-on-demand coating systems for analyzing drops ejected by coating product applicators are difficult to use and adjust due to the dependence on the number of drops in the visual field affecting the lighting and sensitivity of image sensors, leading to potential dazzling and compliance issues with explosive atmosphere regulations.
Innovation Solution
A system with a light source and image acquisition device positioned on the same side of the observation zone, allowing for easier adjustment and installation outside explosive atmosphere zones, featuring a stroboscope and multiple image acquisition devices to enhance precision and reduce dazzling, with a background for improved contrast and a control system for drop ejection synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the image acquisition device is positioned opposite the light source (ombroscopy principle), then the drops are observed against the light for better visibility, but the image acquisition device is dazzled by the light and requires frequent adjustment of lighting power or sensor sensitivity
Solution Approach 1:
The patent inverts the conventional ombroscopy arrangement by positioning both the light source and image acquisition device on the same side of the observation zone, rather than opposite sides. This inversion eliminates the dazzling effect on the sensor while still enabling drop observation through side-illumination geometry, resolving the contradiction between visibility and operational ease
2Measurement precision
If the light source and image acquisition device are positioned on opposite sides of the observation zone, then drop observation is performed according to the ombroscopy principle, but the system requires compliance with explosive atmosphere regulations (ATEX) and complex installation procedures
Solution Approach 1:
By inverting the positional relationship between light source and image acquisition device to place them on the same side, the patent enables installation outside explosive atmosphere zones, eliminating ATEX compliance requirements and simplifying the manufacturing and installation process while preserving drop analysis capability
3Measurement precision
If multiple image acquisition devices are used to enhance analysis precision, then 3D imaging and measurement accuracy are improved, but the device complexity increases
Solution Approach 1:
The patent introduces a second image acquisition device positioned at a different angle to capture drops from multiple perspectives, enabling 3D reconstruction and enhanced measurement accuracy. This dimensional approach to measurement resolves the contradiction by using spatial arrangement rather than increasing computational or operational complexity
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 simplifies the analysis of drops by reducing the need for frequent adjustments, enhances precision through 3D imaging, and allows for easier compliance with safety regulations by minimizing the risk of dazzling and reducing the complexity of the installation process.
Implementation Method 1
a light source configured to illuminate a drop ejection zone, designated observation zone
Implementation Method 2
featuring a stroboscope and multiple image acquisition devices to enhance precision
Data Source
AI summary
A system for analysing drops capable of being ejected by a coating product applicator, includes a light source configured to illuminate a drop ejection zone, designated observation zone; a first image acquisition device configured to acquire an image of the observation zone; and an image analyser configured to determine, from the image of the observation zone, the presence of drops at a given distance from the applicator, the size of the drops and the absence of satellite; the light source and the first image acquisition device being situated on a same side of the observation zone.