Particle Imaging Guide Element for Accurate Shape Measurement
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Solution Overview
Problem
Existing dynamic image analysis methods struggle to accurately determine the shape and size of particles, particularly elongated ones, due to orientation changes during free fall and overlapping images, which limits the precision of particle characterization.
Innovation Solution
A method and device that restricts particle movement using a guide element, such as an inclined slide track, to align particles with their maximum diameter parallel to the optical axis, combined with a camera system and evaluation unit to capture and analyze digital images, allowing for precise determination of particle shape and size parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If particles are allowed to fall freely during measurement, then the measurement process is simple and fast, but the particle orientation changes randomly causing inaccurate shape determination
Solution Approach 1:
The guide element is configured to align particles in a predetermined orientation (with their maximum diameter parallel to the optical axis) before they enter the measurement area. This preliminary alignment ensures that when particles are captured during free fall, their orientation is controlled, enabling accurate shape determination while maintaining the simplicity and speed of the free fall measurement process.
Solution Approach 2:
A guide element is introduced as an intermediary component between the particle feed and the measurement area. This guide element actively orients particles before measurement, serving as a mediator that resolves the contradiction between simple free-fall measurement and accurate shape determination by controlling particle orientation without complicating the overall measurement process.
2Productivity
If multiple particles are captured in a single image, then the measurement efficiency increases, but overlapping images occur reducing measurement accuracy
Solution Approach 1:
The guide element creates localized single-file particle flow at the critical measurement location, ensuring that particles pass through the measurement area one at a time. This local control of particle distribution prevents overlapping images while maintaining high measurement efficiency through continuous rapid imaging, as each particle is clearly resolved in individual or sequential frames.
3Measurement precision
If the guide element is added to control particle orientation, then shape determination accuracy improves, but device complexity increases
Solution Approach 1:
The guide element utilizes gravitational force and particle self-alignment properties to orient particles passively, replacing the need for complex mechanical manipulation systems. By leveraging the natural tendency of particles to align during controlled descent, the system achieves accurate shape determination with minimal additional mechanical 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
Enables accurate and efficient determination of particle shape and size, particularly for elongated particles, by minimizing orientation-dependent errors and overlapping, thereby improving measurement precision and accuracy.
Implementation Method 1
a stream of particles, such as powders or bulk materials, is passed in free fall in front of a digital camera
Implementation Method 2
The measuring area is illuminated with a light source, and at least one digital image of the particles located in the measuring area at the time of recording is captured with a camera
Data Source
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AI summary
The invention provides an improved method for determining the shape and/or size of particles, in which a plurality of particles (200) are guided through a predetermined measuring area (110), the degrees of freedom of movement of the particles (200) being restricted by a guide element (120) as the particles (200) move through the measuring area (110). Furthermore, the method provides for capturing at least one digital image of the particles (201, 202) located in the measuring area (110) at the time of capture with a camera system (140) and determining the shape and/or size of the depicted particles by evaluating the at least one captured digital image using an evaluation unit, wherein the measuring area is illuminated by a light source (130).