Measurement of water mist particle size generated by rocket launch using a two-wavelength multi-static lidar

Yoshitaka Jin, Nobuo Sugimoto, Tomoaki Nishizawa, Taisuke Yoshitomi, Atsushi Sawada, Wataru Sarae, Akito Hattori, Yoshihiro Yamasaki, Hajime Okamoto, Kaori Sato

Research output: Contribution to journalArticle

Abstract

Water mist generated during a rocket launch is thought to protect the rocket and payloads from acoustic noise. The size of mist particles is essential to understanding the effect on noise reduction. A two-wavelength multi-static lidar was developed for measuring water mist size at the launch site. The lidar determines particle size from signals at three scattering angles at two wavelengths. The method was tested with artificial mist and applied to the Japan Aerospace Exploration Agency’s H-IIA/B large-scale rocket launches. The measured particle size near the outside edge of the mist cloud was 3.5–5 μm in diameter. The extinction coefficient at 532 nm derived using the Klett backward inversion method was 100–200 km−1. The estimated liquid water content (LWC) was ∼0.3 g∕m3. The extinction coefficient was high, but the LWC was comparable to that of the water clouds.

Original languageEnglish
Pages (from-to)6274-6279
Number of pages6
JournalApplied Optics
Volume58
Issue number23
DOIs
Publication statusPublished - Aug 10 2019

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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    Jin, Y., Sugimoto, N., Nishizawa, T., Yoshitomi, T., Sawada, A., Sarae, W., Hattori, A., Yamasaki, Y., Okamoto, H., & Sato, K. (2019). Measurement of water mist particle size generated by rocket launch using a two-wavelength multi-static lidar. Applied Optics, 58(23), 6274-6279. https://doi.org/10.1364/AO.58.006274