Calibration of Probe of Cloud Droplet Based on Forward Scattering

Abstract:

Probe of Cloud Droplet (CDP) based on forward scattering has the characteristics of high efficiency, simple structure, and it is the main instrument for small cloud particle (less than 50μm in diameter) detection. A CDP based on forward scattering was constructed in this paper. Calibration experiment and the measurement of the field of depth were conducted. To measure the depth of field, a pinhole adhered to a rotating disk which is fixed to multi-dimensional optical table is used. The pinhole can be seen as a particle appeared in the detection area periodically, as it moved across the laser beam, the depth of the field can be measured. Standard particles with known size were used to calibrate the system and Mie theory was used to calculate the intensity of forward scattering signal. In the end, combining the experiment results and the theoretical calculations, the response curve which can be used to inverse the size of cloud droplet was obtained.

• Periodical: Applied Mechanics and Materials (Volumes 58-60)
• Pages: 834-839
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.58-60.834
• Online since: June 2011
• Authors: Xing You Huang, Ya Zong Zhu, Ling Bing Bu, Heng Chi Lei
• Keywords: Depth of Field, Forward Scattering, Response Curve, Standard Particle

References

[1] D. Nagel, U. Maixner, W. Strapp et. al. Advancements in Techniques for Calibration and Characterization of In Situ Optical Particle Measuring Probes and Applications to the FSSP-100 Probe[J]. Journal of Atmosphere and Oceanic Technology, 2007, 24: 745~760.

DOI: 10.1175/jtech2006.1

[2] Liu Weiguo, Su Zhengjun et al. Development and Application of New-Generation Airborne Particle Measuring System[J], Journal of Applied Meteorological Science, 2003, 14: 11~18.

[3] D. Baumgardner, M. Spowart, Evaluation of the Forward Scattering Spectrometer Probe. Part III , Time Response and Laser Inhomogeneity Limitations[J], Journal of Atmosphere and Oceanic Technology, 1990, Vol: 7, 666~672.

DOI: 10.1175/1520-0426(1990)007<0666:eotfss>2.0.co;2

[4] LI Yun-bo, SONG Ying-lin, WANG Yu. Improvement of the diaphragm with phase object in the 4f coherent imaging system[J], Infrared and Laser Engineering.

[5] C. F. Bohren, D. R. Hufm. Absorption and scattering of Light by Small particles[M]. New York: John Wiley & Sons, 1983. 83~129.

[6] Jiansheng Xiang, Junhua He. Numerical calculation of Mie theory. Journal of Applied Optics, 28(3): 363~366(2007).