Product Overview

The DAS-M250 is a dedicated basic-grade demodulation card for Distributed Acoustic Sensing (DAS), independently developed by Shanghai Kunlian Technology. It integrates high-speed data acquisition and real-time digital demodulation functions, specifically designed for optical fiber sensing applications such as research institutes, energy pipeline monitoring, border security, and rail transportation. It offers a sampling rate of 250 MSPS and high-precision 16-bit ADC, combined with a 500 MSPS 14-bit DAC. Its embedded IQ demodulation algorithm module can process backward Rayleigh scattering signals from optical fibers in real time, directly outputting phase and amplitude information. Users can directly utilize the demodulated phase data without additional signal processing, providing extensive signal acquisition and output capabilities to meet various high-frequency, high-precision acquisition needs. Simultaneously, the DAS-M250 supports outputting raw ADC sampled data, facilitating secondary demodulation or in-depth analysis for developers with customized algorithm requirements.

Core Features

✅ Direct demodulation and output of full optical cable vibration signals: Built-in high-precision digital IQ demodulation module with real-time upload of demodulated results.

✅ Ultra-long optical cable support capability: Each channel supports fiber lengths up to 52 km (130,048 sampling points), suitable for medium-to-long-distance monitoring scenarios.

✅ High-precision 4-channel synchronous acquisition: Maintains signal consistency and spatial resolution.

✅ High-speed data upload: Based on PCIe 3.0 x8 interface with a transmission bandwidth up to 8 GB/s, supporting simultaneous acquisition and upload.

✅ Excellent platform compatibility: Supports Windows / Linux multi-system environments.

✅ Flexible development support: Provides open SDK and sample programs to support rapid integration and secondary development.

Technical Specifications

Application Fields

✅ Long-distance oil/gas pipeline leakage and intrusion monitoring

✅ Abnormal vibration monitoring around railways/subway tracks

✅ Border and perimeter intrusion defense systems

✅ Bridge and tunnel structural health monitoring

✅ Geological and seismic precursor detection

✅ Smart city and critical infrastructure security