2023年3月23日 · 分布式光纤 声波传感技术 （DAS）可利用大面积铺设的通信光缆作为敏感单元，成为新一代的全天候、大容量、长距离、高灵敏、低成本的声波/振动传感技术。 目 …

2019年10月9日 · In 2016, a novel interrogation technique for phase-sensitive (Φ)OTDR was mathematically formalized and experimentally demonstrated, based on the use of a chirped …

In this work, we elucidate the mechanism behind this global phase crosstalk in heterodyne DAS. We numerically and experimentally demonstrate that pulse apodization helps to mitigate this …

We report the first distributed acoustic sensing (DAS) results over>1,000 km on a field-lab hybrid link using chirped-pulses with correlation detection and 2

2024年12月1日 · Chirped-pulse phase-sensitive optical time-domain reflectometry (CP-ϕOTDR) is a newly developed distributed optical fiber sensing (DOFS) technology that can measure …

Distributed acoustic sensing (DAS) has emerged as a transformational technology for seismic data acquisition. However, noise remains a major impediment, necessitating...

2022年11月3日 · We report the first distributed acoustic sensing (DAS) experiment with over >1,000 km reach on a hybrid link comprising of a mixture of field and lab fibers with bi …

2020年11月5日 · In this report, we present new real-time DAS realized by using the TGD-OFDR (Time Gated Digital-Optical Frequency Domain Reflectometry) method, in which the chirp …

该文提出一种新的成像方法Chirp_Capon算法，即将超声编码发射技术与Capon 算法相结合，利用编码信号优异的相关特性来弥补Capon 算法在对比度上的不足，从而得到了较好的成像结果。

2022年7月13日 · It is shown that, under the conditions studied in this work, a “calibrated” chirped-pulse DAS (CP-DAS) with a completely suppressed reference update-induced 1/f noise …