Compact and high-sensitive pressure sensors with semi-closed structures for detecting slight pressure fluctuation due to tsunami generation

• Project/Area Number: 18K04163
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21030:Measurement engineering-related
• Research Institution: Niigata University
• Principal Investigator: Ohkawa Masashi 新潟大学, 自然科学系, 教授 (90213644)
• Co-Investigator(Kenkyū-buntansha): 佐藤 孝 新潟大学, 自然科学系, フェロー (10143752)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 微気圧センサ / 光導波型センサ / 津波 / 津波検知

Outline of Final Research Achievements

Compact and high-sensitive pressure sensors with semi-closed structures were developed for detecting slight pressure fluctuation due to tsunami formation. A key structure is a semi-closed structure with a small hole or a narrow tube, and high-pass filter characteristics of the structure determine sensor performance. In this study, connections between structure dimensions and step response and frequency response were considered, and design guideline of the structure was established. Moreover, guided-wave optical pressure sensors with semi-closed structures were fabricated and demonstrated. Also, their step responses and frequency responses were measured.

Academic Significance and Societal Importance of the Research Achievements

本研究では，小孔／細管付き半密閉空間構造のステップ応答特性および周波数応答特性を数値流体シミュレーションと実験で評価し，さらに光導波型微気圧センサを試作して，その特性評価を行った。これらは，流体力学，材料力学，導波光学，センサ工学等の分野融合による学際的成果といえる。また，津波生成に伴う微気圧変動の検出可能性が示されたことから，津波による人的被害の軽減が期待できる。

Research Products

• [Journal Article] Frequency characteristics of a semi-closed structure in a guided-wave optical pressure sensor for detection of tsunami formation: investigation based on numerical simulations and experiments (2020)
  • Author(s): Toriyama Taiju、Ono Hana、Takaoka Naoto、Ohkawa Masashi
  • Journal Title: Proceedings of SPIE Volume: 11274 Pages: 60-60
  • DOI: 10.1117/12.2541707
  • Peer Reviewed
• [Presentation] 半密閉空間を有する光導波型微気圧センサにおける誘起圧力差持続時間のノズル長依存性の考察 (2021)
  • Author(s): 瀧口航, 高岡直人, 鳥山大樹, 大河正志
  • Organizer: Optics and Photonics Japan 2021
• [Presentation] 小孔付き半密閉空間を有する光導波型微気圧センサのステップ応答特性 (2021)
  • Author(s): 上島知也, 鳥山大樹, 大河正志
  • Organizer: Optics and Photonics Japan 2021
• [Presentation] Computational Fluid Dynamics Simulation to Determine Frequency Characteristics of a Pressure Sensor with a Semi-Closed Structure (2019)
  • Author(s): Taiju Toriyama, Hana Ono, Naoto Takaoka, Masashi Ohkawa
  • Organizer: Asia Pacific Measurement Forum on Mechanical Quantities (APMF 2019)
  • Int'l Joint Research
• [Presentation] 小孔付き半密閉空間を有する光導波型微気圧センサ～センサ応答の圧力変化率依存性～ (2019)
  • Author(s): 高岡直人，本間健士，小野英，鳥山大樹，大河正志
  • Organizer: Optical & Photonics Japan 2019
• [Presentation] Step Response Dependent on Step Pressure in a Micropressure Sensor with a Semi-Closed Hollow Structure (2018)
  • Author(s): Naoto Takaoka, Hana Ono, Takashi Sato, Masashi Ohkawa
  • Organizer: Asian Conference on Engineering Education 2018
  • Int'l Joint Research
• [Presentation] Step response dependent on applied pressure in a guide-wave optical pressure sensor with a semi-closed space (2018)
  • Author(s): Naoto Takaoka, Hana Ono, Takashi Sato, Masashi Ohkawa
  • Organizer: Microoptics Conference 2018
  • Int'l Joint Research
• [Presentation] 小孔付き半密閉空間を有する微気圧センサにおけるステップ応答の小孔面積依存性 (2018)
  • Author(s): 小野英, 大河正志, 佐藤孝
  • Organizer: 電子情報通信学会ソサイエティ大会