Asphalt Contact Angle Measurement via Droplet Contour Segmentation
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Solution Overview
Problem
The existing static drop method for calculating the contact angle of asphalt surface energy parameters has a complex and slow fitting model with low accuracy, affecting the test accuracy of adhesion between asphalt and aggregate.
Innovation Solution
A method involving acquiring a side image of a stable droplet, determining the baseline, cropping and preprocessing the image to extract droplet contour points, screening out effective contour points on both sides, and performing cubic polynomial fitting to calculate the contact angle, thereby simplifying the fitting model and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the whole droplet contour is used for fitting calculation, then the fitting model is comprehensive, but the model becomes complex and slow with low fitting accuracy
Solution Approach 1:
The patent segments the droplet contour into two parts: the contact line region (where the contact angle is measured) and the top contour region. By fitting only the contact line region points rather than the entire droplet contour, the method reduces model complexity and improves fitting accuracy while maintaining the comprehensive approach of using contour-based measurement.
Solution Approach 2:
The patent extracts and isolates the effective contour points from the contact line region, separating them from the top contour points that are irrelevant to contact angle measurement. This extraction process removes unnecessary data points that complicate the fitting model without contributing to the measurement accuracy.
2Measurement precision
If the whole droplet contour is used for fitting calculation, then all contour information is utilized, but the calculation speed becomes slow
Solution Approach 1:
The patent divides the contour points into relevant (contact line region) and irrelevant (top contour) segments. By performing fitting calculations only on the segmented contact line region points, the computational workload is significantly reduced, thereby increasing calculation speed while preserving measurement accuracy.
Solution Approach 2:
The patent applies partial action by using only the necessary subset of contour points (contact line region) for the fitting calculation, rather than processing all contour points. This partial approach is sufficient to achieve accurate contact angle measurement and dramatically speeds up the calculation process.
3Stability of the object's composition
If the top contour of the droplet is included in fitting, then the complete droplet shape is modeled, but the fitting accuracy of contact angle is reduced
Solution Approach 1:
The patent extracts and removes the top contour points from the fitting calculation process, keeping only the contact line region points. This extraction eliminates the negative impact of top contour points on contact angle fitting accuracy while the complete droplet contour is still captured in the image for reference and complete shape representation.
Solution Approach 2:
The patent applies different treatment to different regions of the droplet contour: the contact line region points are used for high-precision fitting calculation, while the top contour points are excluded. This local differentiation ensures that the region most critical for contact angle measurement receives the most accurate treatment.
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 results in a faster and more accurate calculation of the contact angle, enhancing the evaluation of asphalt surface energy parameters and adhesion with aggregates, leading to improved road performance by reducing water damage.
Implementation Method 1
The static drop test using optical contact angle principle. Dropping a certain amount of test reagent with known surface energy parameter on asphalt coated glass. Using a high-definition camera to obtain image of droplet that forms stable contact angle on the asphalt surface.
Data Source
AI summary
Disclosed is a method, device, and system for testing the static contact angle of reagent asphalt, the method includes the following steps: acquiring a side image of a stable droplet formed by a test reagent on asphalt surface, and determining the position of a baseline in the side image; cropping the side image to obtain a droplet image, and extracting droplet contour points in the droplet image; screening out effective contour points corresponding to contours of the two sides of the droplet from the droplet contour points; performing cubic polynomial fitting on the effective contour points to obtain curve function of contour curves on both sides; calculating contact angle value from the curve function and the position of the baseline. The beneficial effects of this disclosure are: this disclosure reduces the difficulty of fitting of the droplet contour and thus improves the calculation precision of the contact angle.