Automated Drop Positioning via Multi-Angle Light Reflection
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Solution Overview
Problem
Existing methods for determining the contact angle between a liquid drop and a sample surface are prone to inaccuracies due to unclear boundary surfaces, require precise positioning, and often necessitate experienced operators, limiting automation and flexibility.
Innovation Solution
A method using multiple light sources arranged around a drop to detect light reflections with a camera, allowing for the calculation of drop position and size information without requiring precise alignment with the measuring system, enabling flexible and automated evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If shadow image method is used to determine contact angle, then the boundary surface and drop outline become visible, but automated evaluation is limited and experienced operators are needed
Solution Approach 1:
The invention transitions from 2D shadow image analysis to 3D spatial analysis by using multiple light sources positioned at different locations. The camera captures light reflections from multiple angles, creating a three-dimensional understanding of the drop geometry that enables automated contact angle calculation without requiring operator interpretation of shadow images.
Solution Approach 2:
The invention introduces light reflections as an intermediary element between the drop and the camera. Instead of directly imaging the drop boundary, the system uses reflected light from multiple known light source positions to indirectly determine drop geometry, enabling automated evaluation through computational analysis of reflection patterns.
2Device complexity
If contact angle is calculated from drop volume and diameter detected from above, then the method is simple, but relatively significant errors occur with large contact angles
Solution Approach 1:
The invention applies local quality by using multiple light sources positioned at specific locations around the drop rather than a single illumination source. Each light source provides localized illumination that reflects off different portions of the drop surface, enabling accurate determination of local geometry including the contact line region, which is critical for precise contact angle measurement across all contact angle ranges.
Solution Approach 2:
The invention moves from top-down 2D diameter measurement to multi-angle 3D spatial analysis. By capturing light reflections from multiple light source positions and analyzing the three-dimensional geometry of the drop, the system achieves accurate contact angle determination even for large contact angles where traditional diameter-based methods fail.
3Measurement precision
If multiple light sources are used to illuminate the drop, then accurate position and size information can be calculated, but the device complexity increases
Solution Approach 1:
The invention makes the camera serve multiple functions: it captures both the direct image of the drop and the light reflections from multiple light sources. This multi-functional use of a single device component reduces overall system complexity while maintaining the capability to extract precise three-dimensional drop geometry from the combined image data.
Solution Approach 2:
The system uses the light reflections themselves as the measurement signal rather than requiring separate sensors or detectors. The reflected light naturally carries information about drop geometry, and the system processes this self-generated optical signal through computational analysis, eliminating the need for additional complex measurement hardware.
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 approach provides accurate and automated determination of drop position and size, reducing errors and the need for specialized knowledge, and can be applied to irregularly shaped surfaces with increased reliability.
Implementation Method 1
illuminating the drop using several light sources each arranged at a light source position in the surroundings of the drop. In step (c), light reflections of the light sources emanating from the drop are detected using a camera
Data Source
AI summary
A method for analyzing an interaction between a sample surface and a drop of liquid comprises applying the drop of liquid to the sample surface and illuminating the drop of liquid using at least two light sources. The at least two light sources are each arranged at a light source position surrounding the drop of liquid. Light reflected from the drop of liquid detecting and a sensor position on a sensor of a camera is determined for each detected light reflection. Light source positions are assigned to individual light source positions. A position of the drop of liquid is calculated relative to the sensor and an item of size information of the drop of liquid is determined. The position and the item of size information are calculated from the pairs of one sensor position and one associated light source position.