Remote measurement of volcanic gas profile by portable lidar
| Project/Area Number |
18H01667
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 25020:Safety engineering-related
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
Shibata Yasukuni 東京都立大学, システムデザイン研究科, 准教授 (10305419)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2019: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2018: ¥11,180,000 (Direct Cost: ¥8,600,000、Indirect Cost: ¥2,580,000)
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| Keywords | ライダー / SO2 / 差分吸収 / 火山ガス / DIAL / 遠隔計測 / リモートセンシング |
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| Outline of Final Research Achievements |
The purpose of this study is to manufacture a lidar system for measuring SO2 concentration in volcanic gas and to demonstrate its usefulness by field observation. We have developed a light source based on two Nd: YVO4 lasers.
An indoor SO2 gas concentration measurement experiment was conducted, and it was shown that measurement was possible at 0.35±0.06 ppm (±17.1%). The result was that it was possible to measure within ±1ppm, compared to 5ppm, which is said to cause harm to the human body. Due to the delay in laser development and social factors caused by the COVID-19, field experiments could only be performed twice, and valid data could not be obtained.
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| Academic Significance and Societal Importance of the Research Achievements |
現状、直接センサを用いてガス濃度を計測する手法が主流であり、平面分布を得るには多数のセンサが必要となる。また、紫外光に感度のあるCCDカメラでSO2の吸収帯に当たる波長（～310 nm）とSO2の吸収帯からずれた波長（～330 nm）を撮像し、光の吸収量の差からSO2カラム量分布イメージを遠隔計測する手法は空間分布を得ることができない。本研究の成果は、SO2ガス分布の空間分布計測が可能であることを示すものであり、火山ガス分布の状況をリアルタイムで把握することで、防災・減災のみならず、経済活動への影響を最小限に抑えることが期待できる。
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Report
(4 results)
Research Products
(4 results)
