Compact Distributed DAS All Demodulation Module with Integrated Acquisition Card

Summarize

Coherent fading suppression DAS all-fiber demodulation module deeply integrates DAS optical acquisition front-end and DAS high-speed data processing back-end, and its length, width and size are only half A4 paper, providing a compact and convenient solution for distributed fiber acoustic wave measurement.

DAS optical acquisition front-end part, which integrates ultra-narrow linewidth light source, modulator, amplifier and coherent receiver module, realizes high signal-to-noise ratio coherent detection and ultra-long distance sensing, and ensures excellent performance of optical link.

Among them, DAS high-speed data processing back-end part adopts dual-channel 250MSps DAS high-speed acquisition card, supports Gigabit Ethernet communication (data transmission rate up to 1000Mb/s) or 10G optical port communication (data transmission rate up to 10Gb/s), and can collect more than 100km optical fiber data. Built-in phase demodulation algorithm, realize all-fiber demodulation and coherent fading suppression, can directly output amplitude and phase demodulation data, in which phase data can be directly used as vibration signal without secondary de-winding; can also output original sampling data for user-defined demodulation. This design reduces the dependence of the system on CPU computing power, simplifies the development process, and realizes "data reading is available, phase is vibration".

Character

• High-speed data acquisition and transmission
• Built-in all-fiber demodulation and coherent fading suppression algorithm
• Highly integrated compact design

Application

• Perimeter intrusion monitoring
• Oil and gas pipeline leakage warning
• Structural health monitoring of tunnels and slopes
• Submarine/Land Cable Condition Monitoring
• Urban Infrastructure Vibration Monitoring

II. Product Performance Parameters

III. Product Size Specification

[Figure 2] Product size description diagram

IV. Description of Product Interface and Indicator Light

Table 1 Description of product interface

Table 2 Description of product indicator light