4.5 Article

Time-Expanded Φ-OTDR Based on Binary Sequences

期刊

IEEE PHOTONICS TECHNOLOGY LETTERS
卷 34, 期 13, 页码 695-698

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2022.3181819

关键词

Pseudo random binary sequences; structural health monitoring; time-expanded Phi-OTDR; Rayleigh scattering; dual frequency combs

资金

  1. Spanish the Ministry of Science and Innovation (MICINN) [DI-17-09169]
  2. Project Centro para el Desarrollo Tecnologico Industrial (CDTI) [IDI 20210156]
  3. Comunidad de Madrid
  4. FEDER Program [P2018/NMT-4326]
  5. Spanish Government [RTI2018-097957-B-C31/C33]
  6. Spanish Ministerio de Ciencia e Innovacion (MCIN)/Agencia Estatal de Investigacion (AEI) [10.13039/501100011033]
  7. European Union Next Generation lan de Recuperacion, Transformacion y Resiliencia (EU-PRTR) Program through Project PSI [PLEC2021-007875]
  8. Spanish MICINN [PRE-2019-087444, IJC2018-035684-I]

向作者/读者索取更多资源

This letter demonstrates the capabilities of time-expanded phase-sensitive optical time-domain reflectometry (TE Phi-OTDR) using binary sequences. The presented approach allows for a customized distributed optical fiber sensor by changing the length of the binary sequence and the reference clock frequencies. The use of large binary sequences eliminates the need for arbitrary signal generators and enables simple and cost-effective creation of dual comb spectra.
In this letter, the capabilities of time-expanded phase-sensitive optical time-domain reflectometry (TE Phi-OTDR) using binary sequences are demonstrated. We present a highly flexible and integrable TE Phi-OTDR approach that allows a customized distributed optical fiber sensor (range, spatial resolution, and acoustic sampling) by simply changing the length of the binary sequence and the reference clock frequencies of the binary sequence generators. The here presented architecture eliminates the need for the cumbersome arbitrary signal generators used to date to create the dual-comb spectra for interrogating the fiber. In this approach, the use of large binary sequences allows us to obtain dual combs in a simple and cost-effective way. Spatial resolution of similar to 1 cm is achieved, attaining similar to 15,000 independent measurements points along the interrogated fiber, with a capability of sensing similar to 30,000 measurements points.

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