Quasi-acoustic impedance matching distributed opto-mechanical sensor with aluminized coating optical fibers

Yongkang Dong, Yuli Ren, Hongwei Li, Arkady Shipulin, Dengwang Zhou, Tianfu Li, Hongying Zhang, Dianyang Lin, Dexin Ba

Research output: Contribution to journalArticlepeer-review


The uncoated single-mode fiber has been extensively researched as an opto-mechanical sensor since it can achieve substance identification of the surrounding media by exciting and detecting transverse acoustic waves via forward stimulated Brillouin scattering (FSBS), but it has the danger of being easily broken. Although polyimide-coated fibers are reported to allow transverse acoustic waves transmission through the coating to reach the ambient while maintaining the mechanical properties of the fiber, it still suffers from the problems of hygroscopic property and spectral instability. Here, we propose a distributed FSBS-based opto-mechanical sensor using an aluminized coating optical fiber. Benefiting from the quasi-acoustic impedance matching condition of the aluminized coating and silica core cladding, aluminized coating optical fibers not only have stronger mechanical properties and higher transverse acoustic wave transmission efficiency but also have a higher signal-to-noise ratio, compared with the polyimide coating fibers. The distributed measurement ability is verified by identifying air and water around the aluminized coating optical fiber with a spatial resolution of 2 m. In addition, the proposed sensor is immune to external relative humidity changes, which is beneficial for liquid acoustic impedance measurements.

Original languageEnglish
Pages (from-to)5696-5699
Number of pages4
JournalOptics Letters
Issue number21
StatePublished - 1 Nov 2022
Externally publishedYes

Bibliographical note

Funding Information:
Funding. National Natural Science Foundation of China (61975045, 62075051); Science Foundation of Heilongjiang Province (LH2020F014); Postdoctoral Scientific Research Developmental Fund of Heilongjiang Province (LBH-Q21092).

Publisher Copyright:
© 2022 Optica Publishing Group.


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