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

doi:10.1364/AO.58.006274

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

Division of Earth Environment Dynamics

Research output: Contribution to journal › Article › peer-review

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 language	English
Pages (from-to)	6274-6279
Number of pages	6
Journal	Applied Optics
Volume	58
Issue number	23
DOIs	https://doi.org/10.1364/AO.58.006274
Publication status	Published - 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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10.1364/AO.58.006274

Cite this

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

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{\textquoteright}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.",

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

note = "Funding Information: Japan Society for the Promotion of Science (JSPS) (JP17H06139,JP18K03745); Japan Aerospace Exploration Agency (JAXA); Kyushu University. Publisher Copyright: {\textcopyright} 2019 Optical Society of America.",

year = "2019",

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doi = "10.1364/AO.58.006274",

language = "English",

volume = "58",

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T1 - Measurement of water mist particle size generated by rocket launch using a two-wavelength multi-static lidar

AU - Jin, Yoshitaka

AU - Sugimoto, Nobuo

AU - Nishizawa, Tomoaki

AU - Yoshitomi, Taisuke

AU - Sawada, Atsushi

AU - Sarae, Wataru

AU - Hattori, Akito

AU - Yamasaki, Yoshihiro

AU - Okamoto, Hajime

AU - Sato, Kaori

N1 - Funding Information: Japan Society for the Promotion of Science (JSPS) (JP17H06139,JP18K03745); Japan Aerospace Exploration Agency (JAXA); Kyushu University. Publisher Copyright: © 2019 Optical Society of America.

PY - 2019/8/10

Y1 - 2019/8/10

N2 - 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.

AB - 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.

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

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