A distributed hydrophone optical cable

CN224435562UActive Publication Date: 2026-06-30QUALSEN (GUANGZHOU) TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-07-09
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Traditional underwater audio cables have limited underwater coverage, low detection sensitivity, and are susceptible to electromagnetic interference, making it difficult to guarantee system stability and consistency.

Method used

The distributed hydrophone cable design includes an outer protective sheath, a sensing unit, and a sensitive fiber. Through a spiral winding structure and an acoustic impedance matching agent, it enhances the response sensitivity to underwater acoustic pressure signals and utilizes the phase-sensitive optical time-domain reflectometry principle to achieve continuous monitoring while avoiding electromagnetic interference.

Benefits of technology

It achieves continuous sound field sampling with meter-level spatial resolution over tens of kilometers of optical cable, improving the coverage and response accuracy of underwater sensing systems. It also features passive characteristics and electromagnetic interference immunity, making it suitable for long-term covert underwater deployment.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model relates to the field of fiber optic sensing technology, and more specifically, to a distributed hydrophone cable. The purpose of this utility model is to solve the problems of small underwater coverage and low detection sensitivity. The distributed hydrophone cable includes an outer protective sleeve and sensing units and connecting optical fibers disposed within the outer protective sleeve. Each sensing unit includes a housing, a basic element, and a sensitive-enhancing optical fiber. The housing is disposed at intervals within the outer protective sleeve and has a first fiber guide hole, a second fiber guide hole, and multiple acoustic guide holes, with the first and second fiber guide holes positioned one after the other. The basic element is disposed within the housing and includes two basic element end faces and a basic element peripheral surface connecting the basic element end faces, with the two basic element end faces positioned one after the other. The sensitive-enhancing optical fiber enters the housing through the first fiber guide hole, spirally winds around the basic element, and then exits through the second fiber guide hole. Adjacent sensitive-enhancing optical fibers are connected by connecting optical fibers. The gaps between the housing and the basic element, as well as the gaps between the outer protective sleeve and the housing, are filled with acoustic impedance matching agent.
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