Compound-Eye Lens Tomographic PIV Ghost Particle Suppression
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Solution Overview
Problem
Current particle image velocimetry systems using tomographic PIV face challenges in measuring three-dimensional velocity fields due to the presence of ghost particles, which degrades measurement precision, and require a large number of cameras, increasing costs and setup complexity.
Innovation Solution
A particle image velocimetry system employing a compound-eye lens with multiple monocular lenses, which functions as a single imaging device, reduces the number of cameras needed by suppressing ghost particle influence and simplifying setup, while maintaining high measurement precision through direct three-dimensional velocity field measurement using tomography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple cameras are used to measure three-dimensional velocity field by tomographic PIV, then measurement capability is improved, but ghost particles are generated which degrade measurement precision
Solution Approach 1:
The patent segments the imaging function into multiple monocular lenses within a single camera, where each lens captures images from a slightly different direction. This segmentation allows the system to obtain multi-directional imaging data without using multiple separate cameras, thereby avoiding ghost particle generation while maintaining three-dimensional velocity field measurement capability through tomographic reconstruction.
2Measurement precision
If the number of cameras is increased to reduce ghost particles, then measurement precision is improved, but equipment cost and setup complexity increase
Solution Approach 1:
The patent merges multiple imaging functions into a single camera by incorporating multiple monocular lenses. This combination achieves the effect of using multiple cameras (reducing ghost particles) while avoiding the drawbacks of multiple separate cameras (high cost and complex setup). The multiple lenses are integrated within one camera body, sharing common structure and control systems.
3Adaptability or versatility
If multiple cameras are used for three-dimensional velocity field measurement, then imaging capability is improved, but installation space and setup time increase
Solution Approach 1:
The patent combines multiple imaging functions into a single camera body with multiple monocular lenses, dramatically reducing the installation space required. Instead of needing to accommodate multiple separate cameras and their associated mounting structures, the system requires space for only one camera, making it suitable for environments with limited space while maintaining the capability to capture three-dimensional velocity field data.
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 enhances measurement precision, reduces equipment costs, and simplifies installation by minimizing the number of cameras, ensuring accurate three-dimensional velocity field measurements without degrading precision due to camera displacement.
Implementation Method 1
measuring the velocity field of three velocity components in the three-dimensional space by tomography from the obtained images at the two times
Implementation Method 2
an imaging device comprising an imaging lens that takes an image of tracer particles, a compound-eye lens that comprises a large number of monocular lenses for taking images of the images taken by the imaging lens
Implementation Method 3
a light receiving element that subjects the image taken by the monocular lens to photoelectric conversion
Implementation Method 4
illuminating tracer particles flowing around an object with laser light at two times separated by a very small period of time
Data Source
AI summary
An imaging device can take an image of a flow field including tracer particles includes a compound-eye lens formed from a large number of monocular lenses, which take images of images taken by an imaging lens. Each of the multiple monocular lenses functions as one imaging device. This can enable measurement precision to be enhanced by suppressing the influence of ghost particles, while reducing the equipment cost by minimizing the number of imaging devices. A space for installing the imaging device can easily ensured. If a large number of imaging devices are used, not only do they require time and manpower for setting up, but there is also a possibility that the measurement precision will be degraded due to displacement of an axis of the imaging devices caused by vibration, etc. When the imaging device having the compound-eye lens is used, setup is simplified, and measurement precision can be ensured.