Product Overview:

The DAS distributed fiber-optic vibration/acoustic sensing system is based on coherent Rayleigh scattering. It uses optical fiber as a continuous sensing array to capture vibration, acoustic, and disturbance events along the route. The system provides event location, classification, and alarm information for large-area unattended monitoring.

Key Features:

• Uses existing communication fiber or sensing cable for long-distance continuous monitoring.

• Detects intrusion, knocking, excavation, vehicle movement, leakage, cable damage, and other events.

• Can integrate with algorithms, map platforms, and alarm systems to improve field response efficiency.

Applications:

• Perimeter security for airports, industrial parks, borders, and restricted areas.

• Third-party damage monitoring for oil/gas pipelines, water pipelines, submarine cables, and telecom cables.

• Safety monitoring for slopes, conveyors, railways, highways, bridges, and critical infrastructure.

1.Description

1.1.General Introduction and Technology

The Distributed Acoustic Sensing (DAS) system operates as a large-scale, mobile interferometric sensor, capable of detecting dynamic perturbations—such as acoustic waves or mechanical vibrations—along an optical fiber. When an external stimulus induces a localized, time-varying phase shift in the backscattered interferometric signal, DAS enables quantitative measurement of the associated physical phenomena by demodulating the temporal evolution of the optical phase at each fiber location.

DAS technology has been widely adopted in various fields due to its ability to transform standard optical fibers into dense arrays of acoustic sensors without requiring any active components in the field. Typical applications include oil and gas pipeline monitoring for leak detection and third-party interference, perimeter intrusion detection in critical infrastructure security, structural health monitoring of bridges and tunnels, as well as seismic and microseismic data acquisition in geophysical exploration. In all these scenarios, DAS offers real-time, distributed, and cost-effective sensing solutions with meter-level spatial resolution and high sensitivity.

1.2.Key Features

-High Spatial Resolution

-Long Sensing Range

-High Sensitivity & Wide Dynamic Range

-Broad Frequency Response

-Real-Time Data Acquisition & Processing

-Intelligent Event Classification & Analytics

-User-Friendly Software Interface

2.Characteristics

Spatial Resolution, Maximum Sensing Range, Sampling Rate, Sensitivity, Sensitivity Disparity, Fiber Connector

3.Operation and Conditions