Flow Field Visualization Device Plasma Light Filtering
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Solution Overview
Problem
Traditional visualization methods for flow fields in low-pressure vacuum CVD processes face challenges such as overexposure and poor image capture due to high background brightness and limited visualization range, leading to inaccurate particle image analysis.
Innovation Solution
A visualization device comprising a chamber, power supply, electrodes, and a flow field observation module with a high-speed camera, light detecting component, and light filter component, which generates and captures images of plasma-excited fluid particles, adjusting light intensity and wavelength to enhance image capture range and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If plasma is used to replace laser illumination for visualization analysis, then the flow field can be visualized without normal pressure requirements, but the background brightness increases and light intensity causes overexposure during high-speed camera capture
Solution Approach 1:
A light filter component is introduced as an intermediary between the plasma source and the high-speed camera. This filter selectively transmits the wavelength range where fluid particles emit light while blocking the broader plasma emission spectrum, thereby reducing background brightness and preventing overexposure while maintaining the ability to visualize low-pressure flow fields
Solution Approach 2:
The light filter component is designed to selectively transmit only the specific wavelength range where fluid particles emit light. This local quality approach ensures that only the relevant emission from fluid particles reaches the camera, while other plasma emissions are filtered out, solving the overexposure problem without compromising flow field visualization
2Measurement precision
If traditional laser illumination is used for visualization analysis, then image capture can be performed under normal pressure, but the visualization range for low-pressure vacuum plasma development is limited and accuracy is insufficient
Solution Approach 1:
The system transitions from laser illumination to plasma illumination, fundamentally changing the illumination mechanism to enable operation in low-pressure vacuum environments. The plasma generator creates a plasma environment that allows fluid particles to be excited and emit light, making visualization possible across a broader pressure range including vacuum conditions
Solution Approach 2:
The light filter component acts as a mediator that enables accurate particle image capture by selectively transmitting only the wavelength range where fluid particles emit light. This filtering mechanism improves measurement precision by eliminating background noise and enhancing the signal from fluid particles, thereby improving particle image accuracy
3Area of stationary object
If plasma illumination is used without light filtering, then the entire flow field can be illuminated, but overexposure occurs during high-speed camera capture resulting in poor image quality
Solution Approach 1:
The light filter component is designed with specific wavelength transmission characteristics that match the emission spectrum of excited fluid particles. This local quality filtering allows the entire flow field to remain illuminated while selectively blocking excessive background light, thereby maintaining wide visualization coverage without causing overexposure
Solution Approach 2:
The light filter serves as an intermediary element between the plasma illumination source and the high-speed camera. It mediates the light transmission by allowing relevant wavelengths from fluid particles to pass through while blocking excessive plasma emission, thus preserving image capture quality across the entire flow field visualization range
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 solution enables improved visualization and analysis of flow fields by reducing overexposure and increasing the image capture range, resulting in more authentic and accurate representations of fluid particle movements.
Implementation Method 1
the power supply outputs a voltage to generate a plasma
Implementation Method 2
plasma development may replace laser illumination using the characteristic of emitting light by exciting a fluid with plasma
Implementation Method 3
The light filter component is disposed between the high-speed camera and the chamber, and the light detecting component is configured to obtain a light information in the chamber and send the light information to the light filter component
Data Source
AI summary
A visualization device for a flow field includes a chamber, a power supply, at least one pair of electrodes, and at least one flow field observation module. The flow field observation module includes a high-speed camera, a light detecting component, and a light filter component. The power supply outputs a voltage to generate a plasma, and the pair of electrodes is disposed in the chamber. The flow field observation module is disposed outside the chamber and captures an image of a fluid particle excited by the plasma toward the chamber. The light filter component is disposed between the high-speed camera and the chamber. The light detecting component obtains a light information within the chamber and sends the light information to the light filter component.