Rørstadbotnen Robin Andre, Eidsvik Jo, Langhammer Jan, Landrø Martin, Mohammad Ibrahim Osman
Acoustic group, Department of Electronic Systems, Norwegian University of Science and Technology (NTNU), O. S. Bragstads Plass 2A, 7491, Trondheim, Norway.
Centre for Geophysical Forecasting, Norwegian University of Science and Technology (NTNU), O. S. Bragstads Plass 2A, 7491, Trondheim, Norway.
Sci Rep. 2025 Apr 20;15(1):13629. doi: 10.1038/s41598-025-97017-z.
Existing networks of fiber optic telecommunication infrastructure can be used to measure acoustic events. For this purpose, a laser instrumentation is attached to a "dark fiber" turning it into a Distributed Acoustic Sensing (DAS) device. In May 2023, a DAS test was conducted to measure acoustic activity in Oslo, Norway. The main purpose was to measure the "pulse" of the Oslo city center during the Norwegian National Day parade. Additionally, five days before and after the National Day were recorded for reference to daily acoustic background noise conditions in Oslo. Data during the National Day captured the yearly parade in which schools and bands participate. Using this data, it was possible to detect the participating bands, analyze their frequency content, and estimate their walking speed and step length. High-order harmonics were recognized in the frequency response for the bands. A total of 88 bands participated in the parade and 87 were detected using the harmonic characteristics. While one individual band could be tracked before the main parade over separate streets, it was challenging to continue the track for other bands within the parade. The test revealed that DAS can be used as part of decision support systems for crowd monitoring.
现有的光纤电信基础设施网络可用于测量声学事件。为此，将激光仪器连接到“暗光纤”上，使其成为分布式声学传感（DAS）设备。2023年5月，在挪威奥斯陆进行了一次DAS测试，以测量声学活动。主要目的是在挪威国庆阅兵期间测量奥斯陆市中心的“脉动”。此外，在国庆节前后五天进行了记录，以参考奥斯陆的日常声学背景噪声情况。国庆节期间的数据记录了学校和乐队参加的年度阅兵。利用这些数据，可以检测出参与的乐队，分析其频率成分，并估计其行走速度和步长。在乐队的频率响应中识别出了高阶谐波。共有88支乐队参加了阅兵，利用谐波特征检测出了87支。虽然在主要阅兵之前可以在不同街道上跟踪一支单独的乐队，但在阅兵中继续跟踪其他乐队具有挑战性。测试表明，DAS可作为人群监测决策支持系统的一部分。
