Curved Surface Contact Angle Measurement Correction
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Solution Overview
Problem
Existing contact-angle measurement methods fail to precisely measure the contact angle on curved surfaces, such as those found in artificial hip joint liners, due to the lack of correction for the sample surface's curvature, leading to inaccurate wettability assessments.
Innovation Solution
A contact-angle measurement method that calculates the true contact angle by correcting the apparent contact angle using the inclination angle of the sample's curved surface, taking into account the curvature radii of both the droplet and the sample surface, through image processing and trigonometric calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the conventional contact-angle measurement method is used on a curved surface, then the measurement process is simple, but the measurement precision deteriorates due to lack of curvature correction
Solution Approach 1:
The patent applies preliminary action by pre-calculating the inclination angle of the curved surface and pre-determining the correction amount before performing the contact angle measurement. This allows the measurement system to automatically compensate for curvature effects without adding complex hardware, thereby improving measurement precision while maintaining relatively simple device complexity.
2Measurement precision
If curvature correction is applied to improve measurement precision, then the contact angle measurement becomes accurate, but the calculation process becomes more complex
Solution Approach 1:
The patent replaces complex manual calculation and measurement procedures with an automated image processing system. The inclination angle calculation unit automatically computes the curvature correction based on captured images, substituting manual geometric analysis with computational algorithms. This reduces the difficulty of detection and measurement while achieving precise contact angle measurements on curved surfaces.
3Reliability
If the conventional method is used without curvature consideration, then the ease of operation is maintained, but the reliability of wettability assessment deteriorates
Solution Approach 1:
The patent applies self-service by enabling the measurement system to automatically detect the curved surface geometry and perform self-correction of the contact angle measurement. The system autonomously calculates the inclination angle and applies the appropriate correction without requiring manual intervention or complex user operations. This maintains ease of operation while significantly improving the reliability of wettability assessment on curved surfaces.
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 allows for more precise measurement of contact angles on curved surfaces, enhancing the accuracy of wettability assessments and ensuring the desired performance of coating layers on bioprosthetic members.
Implementation Method 1
an image of the droplet 2 on the sample curved surface 104 is captured by an image capturing unit (7)
Data Source
AI summary
This contact-angle measurement method is a contact-angle measurement method for measuring a contact angle (γ) between a droplet that is supplied to a sample curved surface and the sample curved surface. This method includes an apparent contact-angle calculation step of calculating an apparent contact-angle (α) of the droplet by using a captured image of the droplet supplied to the sample curved surface and the sample curved surface; an inclination angle calculation step of calculating an inclination angle (β) of the sample curved surface at an outer periphery portion of a contact portion between the droplet and the sample curved surface by using the captured image; and a contact-angle calculation step of calculating the contact angle (γ) by correcting the apparent contact angle (α), using the inclination angle (β).