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DAS-U1000 Extreme Edition Demodulation Card
Product Details
Product Overview
The DAS-U1000 Distributed Acoustic Sensing Demodulation Card, independently developed by Shanghai Kunlian Technology, is a flagship DAS demodulation system specifically designed for extreme environmental monitoring and high-precision sensing applications. The system is configured with 4 channels of 1000 MSPS sampling rate, 16-bit ADCs and a single channel 2500 MSPS 14-bit DAC. It supports external reference clock input, achieving an exceptional balance between long distance, high dynamic range, and high spatial resolution to meet stringent engineering-grade monitoring requirements.
The core technological highlight of the DAS-U1000 lies in its systematic resolution of the inherent coupling constraints among spatial resolution, sensing range, and dynamic range—a first in distributed optical fiber sensing systems. Through a new-generation coherent noise modeling algorithm and a polarization state adaptive compensation mechanism, it effectively suppresses signal degradation caused by coherent fading and polarization randomness. This enables the system to maintain spatial resolution better than 1 meter and high signal-to-noise ratio detection capability even over tens of kilometers of transmission distance.
Core Technical Advantages
✅ Dual Noise Suppression Mechanism:
Integrated coherent fading and polarization fading suppression algorithms, significantly improving the accuracy of weak event signal identification.
✅ Breakthrough in Triple Constraint Limitations:
Enables relatively independent optimization of the three key parameters: spatial resolution, sensing range, and dynamic range.
✅ Advanced FPGA Algorithm:
Implements parallel signal processing and efficient analysis through embedded FPGA algorithms, greatly enhancing the identification efficiency and analytical capability for acoustic wave events.
✅ External Clock Synchronization Support:
Can interface with high-stability reference clocks, enhancing system stability and precision in multi-channel, long-distance cooperative monitoring scenarios.
✅ 4-Channel 1000MSPS High-Speed Sampling:
Supports large bandwidth and synchronous acquisition, capturing high-frequency vibration and transient acoustic signals to meet extreme environment monitoring demands.
✅ Spatial Resolution Better Than 0.5 Meters:
Utilizes a high-precision time-domain demodulation structure, supporting sub-meter acoustic vibration localization, particularly suitable for monitoring structural detail responses.
Performance Specifications
| Parameter | Specification |
|---|---|
| Analog Input Channels | 4 channels |
| Maximum Sensing Distance | 60 km (Max) |
| Spatial Resolution | 1 m (Min) |
| Sampling Rate | 1000MSPS / per channel |
| Response Frequency | 1 Hz ~ 20 kHz |
| Dynamic Range | ≥ 95 dB @ 10 Hz |
| Coupling Mode | DC Coupling |
| Input Voltage Range | 2Vpp |
| Analog Bandwidth | 0 ~ 100 MHz |
| Offset Adjustment | ±1V Adjustable |
| SFDR (Spurious-Free Dynamic Range) | Up to 88dBc |
| Internal Memory | 2 sets of DDR4 memory: 1 set 16-bit 4GByte, 1 set 32-bit 2GByte |
| Interface Type | PCIe 3.0 x8 Interface |
| Operating Temperature Range | -20 ℃ ~ 50 ℃ |
| Demodulation Algorithm | Built-in I/Q phase demodulation; can output raw or demodulated data |
| Trigger Output | Supports synchronous pulse output |
| System Compatibility | Windows / Linux |
Application Fields
✅ Oil & Gas and Subsurface Pipeline Integrity Monitoring: Rapid identification of anomalies such as leaks, impacts, and third-party interference.
✅ Seismic and Geological Activity Detection: High-precision tracking of microseismic events and rock mass movements.
✅ Large-Scale Infrastructure Health Sensing: For detecting structural fatigue, cracks, and resonance in bridges, dams, high-speed rail tracks, etc.
✅ Underwater and Perimeter Security Monitoring: Suitable for intrusion detection and potential target identification in complex environments.
✅ Industrial Rotating Machinery Monitoring: Identifies abnormal vibrations to support predictive maintenance.
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