研究目的
To count microscopic particles such as aerosols by Laser-Two-Focus method after being trapped and guided by an optical tube, reducing particles diffusivity and increasing measurement accuracy.
研究成果
Guiding particles within a BG01 beam as an optical tube and into the measuring volume of the L2F method significantly increased measurement accuracy by reducing transverse turbulence and increasing the probability of particles passing through the Gaussian beams. This method showed a 20% increase in the condensation of aerosols less than 3.5 μm, indicating its potential for more precise measurements of nanometer-sized particles.
研究不足
The study focused on microscopic particles such as aerosols and may not be directly applicable to larger particles or different types of fluids. The method's effectiveness is also dependent on the precise generation and alignment of the optical beams.
1：Experimental Design and Method Selection:
The study used the Laser-Two-Focus (L2F) method to count particles trapped and guided by an optical tube. Optical forces such as radiation pressure and photophoretic forces were utilized to prevent particle diffusivity.
2：Sample Selection and Data Sources:
Microscopic particles such as aerosols were used, with in-laboratory aerosols less than 3.5 μm being measured.
3：5 μm being measured.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A single-charged Bessel Gaussian beam (BG01) was used as the particle guidance beam, generated by passing the first-order Laguerre-Gaussian beam (LG01) through an axicon lens. The LG01 beam was produced using a holographic interference grid mask.
4：Experimental Procedures and Operational Workflow:
Particles were guided into the measurement volume of the L2F method using the BG01 beam. The probability of particles passing through the Gaussian beams was measured, and the condensation of particles was determined.
5：Data Analysis Methods:
The results showed a reduction in transverse turbulence by about 60% and an increase in the probability of measuring all particles by about 30%. A 20% increase in condensation of aerosols less than 3.5 μm was observed compared to the conventional L2F method.
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