Measurement of density distribution of droplets by laser-induced breakdown

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420138
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Yashiro Hidehiko 国立研究開発法人産業技術総合研究所, 電子光技術研究部門, 主任研究員 (30358197)
• Co-Investigator(Kenkyū-buntansha): KAKEHATA Masayuki 産業技術総合研究所, 電子光技術研究部門, 主任研究員 (70356757)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: レーザー生成プラズマ / レーザー / エアロゾル / 液滴 / ブレークダウン

Outline of Final Research Achievements

Laser-induced breakdown method is the only way that can measure the absolute number density of droplets in aerosol. However, this measurement method requires a large number of laser shots. Moreover, enormous measurement points are required for a spatial density distribution of aerosol. A technique of the density measurements at multiple points simultaneously is essential way to be shortened the measurement time for density distribution. A laser beam is divided into 6x6 beams by a DOE (Diffractive Optical Elements) and focused by a plano-convex lens on lattice-shape. Each breakdown at the multiple measurement points is observed by a camera system. Actual density distribution of aerosol ejected from a spray nozzle is observed plausibly by this system. This measurement system reduces the measurement time for the density distribution of droplets in an aerosol effectively.

Free Research Field

物理学