Oscillating Substrate Holder for 3D Particle Imaging
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Solution Overview
Problem
Current technologies for 3D particle image velocimetry (PIV) face limitations in spatial and temporal resolution, making them inadequate for real-time, high-resolution 3D flow measurements.
Innovation Solution
A compact system that uses an oscillating mechanical movement of the substrate holder to achieve high spatial and temporal resolution for 3D PIV, allowing for real-time detection of particles in a fluidic channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a scanning light sheet is used for 3D particle imaging, then 3D information can be obtained, but the measurement time becomes too long for transient conditions
Solution Approach 1:
The patent employs a dynamic scanning approach where the light sheet is rapidly scanned through the measurement volume at high frequencies. This dynamic scanning enables the system to capture 3D particle information quickly, achieving both high spatial resolution and sufficient temporal resolution for transient flow conditions.
Solution Approach 2:
The system uses periodic scanning of the light sheet through the measurement volume. By repeating the scanning cycle at high frequencies, the system can accumulate 3D information efficiently while maintaining the ability to capture transient phenomena through the periodic nature of the scanning process.
2Measurement precision
If holographic PIV is used for 3D imaging, then 3D information is provided, but the system becomes too complicated and error-prone
Solution Approach 1:
The patent divides the measurement volume into multiple planar sections that are scanned sequentially. This segmentation approach simplifies the overall system by using standard 2D imaging techniques repeated across multiple planes, rather than requiring complex holographic reconstruction algorithms and optics.
Solution Approach 2:
The system replaces complex holographic optical systems with a simpler mechanical scanning approach using a light sheet. Instead of relying on holographic interference patterns and complex phase reconstruction, the system uses direct optical slicing and scanning to achieve 3D measurements.
3Measurement precision
If multiple cameras are used to provide depth information, then 3D imaging is achieved, but the operation time becomes too long
Solution Approach 1:
The patent uses a dynamically scanned light sheet that rapidly moves through the measurement volume. This dynamic scanning approach enables the system to capture depth information at high speeds, achieving both accurate depth resolution and high imaging speed for transient conditions.
Solution Approach 2:
The scanning light sheet continuously scans through the measurement volume in a rapid, continuous manner. This continuous scanning action ensures that depth information is captured without interruption, maintaining high productivity while providing accurate 3D measurements throughout the measurement process.
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 enables efficient, real-time 3D imaging of flows with high spatial and temporal resolution, reducing errors and improving the accuracy of flow measurements.
Implementation Method 1
The system may for example be suitable for optical imaging (making slices at different vertical positions) of an object (e.g. a cell or particle) in a fluidic channel
Implementation Method 2
providing irradiation to the substrate and detecting radiation from particles in the fluid in the substrate
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
Figure 3a~3b
AI summary
A system (100) for imaging particles in a fluid is described. The system (100) comprises a substrate holder (110) for holding a substrate (120) comprising a channel or reservoir (122) for containing the fluid in the substrate (120), a radiation source (130) for providing irradiation in the substrate (120) and a radiation detection unit (140) for detecting particles in the fluid in the substrate. At least one of the radiation source (130) and the radiation detection unit (140) are configured so as to obtain detection in one or more distinct detection sheets (142) in the substrate (120). The system (100) further comprises an actuator (150) configured for imparting an oscillating mechanical movement of the substrate holder (110) with respect to the radiation detection unit (140) and the radiation source (130), the oscillating mechanical movement being a movement comprising a movement component in a direction perpendicular to the plane wherein the one or more detection sheets (142) are extending.