研究目的
Investigating the detection of damage in filtration materials through visualization of the filtration process and measuring filtration efficiency.
研究成果
The study demonstrates a method for detecting damage in filtration materials through visualization and optical measurement. While effective for particles larger than 5 μm, detection of smaller particles is limited by light scattering intensity. The method offers advantages over traditional techniques by allowing localization of damage and fractures in filtration media.
研究不足
The method's accuracy is affected by the non-ideal properties of seeding particles and the inhomogeneity of the laser sheet. Smaller particles require stronger lasers for effective detection.
1：Experimental Design and Method Selection:
The study uses a filtration setup allowing optical access to the filter sample position, illuminated by a laser sheet. Scattered light from seeding particles is captured by a digital camera for analysis.
2：Sample Selection and Data Sources:
A purposely damaged filtration textile sample is tested. Seeding particles of known properties are used to simulate the filtration process.
3：List of Experimental Equipment and Materials:
Includes a digital camera (Pike F-210B/C), lens (Nikon 50 mm), laser unit (50 mW, λ = 532 nm), and seeding particles (5 μm and 1.75 μm polyamide).
4：75 μm polyamide).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The filtration process is visualized and captured over time, with pressure drop and flow rate monitored. Images are analyzed to determine filtration efficiency.
5：Data Analysis Methods:
Digital grey values from images are analyzed to calculate particle concentration and filtration efficiency, with calibration constants determined through simulation and experimental measurement.
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