RAPID: Multiplexed Distributed Acoustic Sensing (DAS) at the Ocean Observatory Initiative (OOI) Regional Cabled Array (RCA)

RAPID：海洋观测计划 (OOI) 区域电缆阵列 (RCA) 的多路复用分布式声学传感 (DAS)

• 批准号: 2415521
• 负责人: Bradley Lipovsky
• 金额: $ 19.81万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-03-01 至 2025-02-28
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2415521&HistoricalAwards=false
• 关键词: RAPID; Multiplexed; Distributed; Acoustic; Sensing

Distributed Acoustic Sensing (DAS) is a relatively new observational technique in academia that interrogates an optical fiber with repeated laser pulses and utilizes changes in the phase of backscattered light to measure the strain rate along the fiber. If successful, this test will demonstrate the feasibility of multiplexed DAS on the Ocean Observatory Initiative’s (OOI) Regional Cabled Array (RCA)and would open the door for large-scale seafloor monitoring using the numerous existing telecom cables. Permanent, offshore DAS arrays have the potential to dramatically improve warning times for both great earthquakes in the Cascadia subduction zone. University of Washington postdocs will get experience leading data acquisition and quality control analysis.In November 2021 NSF-funded pilot experiment demonstrated the feasibility of making DAS observations using optical fibers in the two submarine cables of the Ocean Observatory Initiative’s (OOI) Regional Cabled Array (RCA) offshore Oregon. This test will take advantage of a planned brief maintenance shutdown to acquire both lit-fiber and dark-fiber DAS data on the same cable and with the same instrument to evaluate system performance. It will consist of a 4-day test of DAS on the OOI RCA in March 2024 using L-band DAS to record on lit fiber without interrupting ordinary RCA data telemetry. The advantage of a test that includes a shutdown is that we will observe both the DAS data quality with and without telecom data, as well as the telecom data quality with and without DAS.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

分布式声学传感（DAS）是学术界一种相对较新的观测技术，它用重复的激光脉冲询问光纤，并利用反向散射光的相位变化来测量沿光纤的应变率。如果成功，该测试将证明其可行性。海洋观测计划 (OOI) 区域电缆阵列 (RCA) 上的多路 DAS 的应用，将为使用大量现有电信电缆进行大规模海底监测打开大门。永久性海上 DAS 阵列有可能显着缩短卡斯卡迪亚俯冲带两次大地震的预警时间。华盛顿大学博士后将获得领先的数据采集和质量控制分析经验。2021 年 11 月，美国国家科学基金会 (NSF) 资助的试点实验证明了其可行性。使用海洋观测计划 (OOI) 俄勒冈州近海区域电缆阵列 (RCA) 的两条海底电缆中的光纤进行 DAS 观测 该测试将利用计划中的短暂维护停机时间来获取这两条海底电缆。它将包括 2024 年 3 月在 OOI RCA 上进行为期 4 天的 DAS 测试，使用 L 波段 DAS 记录亮光纤。不中断普通 RCA 数据遥测的测试的优点是，我们将观察有和没有电信数据的 DAS 数据质量，以及有和没有 DAS 的电信数据质量。该奖项反映了。通过使用基金会的智力价值和更广泛的影响审查标准进行评估，NSF 的法定使命被认为值得支持。