研究目的
To identify the influence of a third glare point on the measurements performed in Interferometric Laser Imaging for Droplet Sizing at the scattering angle 90?.
研究成果
The study concludes that the presence of a third glare point due to p = 3 scattering cannot be neglected in ILIDS at a scattering angle of 90?. While most cases allow for accurate size estimation by considering three-wave interference patterns, rare cases of dramatic underestimation occur when the intensity of the glare point attributed to p = 1 scattering is very low.
研究不足
The presence of a third glare point can lead to erroneous estimation of droplet sizes, especially when combined with non-uniform illumination of the droplet. The complexity of light scattering at 90? and the potential for misalignment in the ILIDS setup add uncertainty to the measurements.
1：Experimental Design and Method Selection:
The study involves interferometric out-of-focus imaging to measure the size of droplets and ice particles in the atmosphere. A laser beam crosses the particle’s path, and a defocused imaging system records 2-dimensional interference patterns due to light scattered by the particles.
2：Sample Selection and Data Sources:
Water droplets are generated by a plant sprayer, falling in a column at ambient temperature. Imaging experiments are performed at the bottom of the column through glass windows.
3：List of Experimental Equipment and Materials:
The setup includes a frequency-doubled Nd:YAG laser, cylindrical and spherical lenses for forming a laser sheet, a beam splitter, two imaging lines, and two cameras for in-focus and out-of-focus imaging.
4：Experimental Procedures and Operational Workflow:
The field scattered by the droplets is collected at a scattering angle of 90?. Out-of-focus and in-focus imaging are realized simultaneously using a beam splitter, two imaging lines, and two cameras.
5：0?. Out-of-focus and in-focus imaging are realized simultaneously using a beam splitter, two imaging lines, and two cameras.
Data Analysis Methods:
5. Data Analysis Methods: The analysis involves determining the optical transfer matrix describing the system from the laser sheet to the CCD sensor and interpreting the interference patterns to estimate droplet sizes.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
