DAS-P250 Professional Demodulation Card

DAS-P250, developed by Shanghai Kunlian Technology, is a professional-grade Distributed Acoustic Sensing (DAS) demodulation card tailored for high-precision acoustic wave detection scenarios. The card integrates the company's proprietary high-speed data acquisition and processing platform, with core configurations including a 250 MSPS high sampling rate, 4-channel synchronous ADC acquisition, 1-channel DAC output, and support for external reference clock input to ensure high signal sampling synchronization and system operation stability. Leveraging Kunlian Technology's self-developed pulse compression encoding modulation DAS technology, the DAS-P250 injects encoded laser signals into the optical fiber and acquires backward Rayleigh scattering signals along the fiber in real time. After FPGA-based real-time demodulation and processing, it accurately reconstructs vibration and acoustic wave variations along the fiber. Compared to traditional DAS systems, the DAS-P250 significantly enhances spatial resolution and signal-to-noise ratio while maintaining long-distance detection capabilities. A key highlight of the card is its built-in coherent fading suppression module, which effectively mitigates signal fluctuations caused by changes in the light source's coherence. In complex environments or long-distance applications, the DAS-P250 significantly improves signal stability and reliability compared to systems without suppression. With a spatial resolution better than 5 meters, it provides a robust foundation for long-distance, high-precision acoustic wave detection.

Mgr. Wang：13761916126 （7*24h）

Email: info@klinxtek.com

Product Details

Product Overview

Name: DAS-P250 Professional Demodulation Card
SKU: DAS-P250 Professional Demodulation Card

The DAS-P250 is a professional-grade Distributed Acoustic Sensing (DAS) demodulation card launched by Shanghai Kunlian Technology for high-precision acoustic wave detection scenarios. The card integrates the company's independently developed high-speed data acquisition and processing platform. Its core configuration includes a 250 MSPS high sampling rate, 4-channel synchronous ADC acquisition channels, 1-channel DAC output channel, and supports external reference clock input, ensuring high signal sampling synchronization and system operation stability. Based on Kunlian Technology's proprietary pulse compression encoding modulation DAS technology, the DAS-P250 can inject encoded laser signals into the optical fiber, acquire backward Rayleigh scattering signals along the line in real time, and, after FPGA-based real-time demodulation and processing, accurately restore information about changes in vibration, acoustic waves, and other parameters along the fiber path.

Compared with traditional DAS systems, the DAS-P250 significantly improves spatial resolution and signal-to-noise ratio while maintaining long-distance detection capabilities. A key highlight of the card is its built-in coherent fading suppression module, which effectively mitigates signal fluctuations caused by variations in the light source's coherence. In complex environments or long-distance applications, the DAS-P250 significantly enhances signal stability and reliability compared to systems without suppression, with a spatial resolution better than 5 meters, providing a solid foundation for long-distance, high-precision acoustic wave detection.

Core Technical Advantages

✅ High Spatial Resolution Capability: Supports clear identification of minor localized disturbances over long-distance fiber optic cables, meeting fine-grained sensing requirements.

✅ Supports Ultra-Long Sensing Links: Effectively compensates for signal attenuation in long-distance transmission, ensuring detection accuracy and stability at remote ends.

✅ Wide-Band, Low-Frequency Response: Possesses sensitive detection capabilities for very low-frequency signals, further expanding the system's application boundaries.

✅ External reference clock input interface enables precise synchronization with the host system.

✅ Self-developed DAS demodulation algorithm and FPGA-based real-time signal processing.

✅ Built-in coherent fading suppression function enhances system stability and anti-interference capability.

✅ Spatial resolution better than 5 meters, meeting precision measurement demands.

Core Performance Parameters

Item	Parameter
Analog Input Channels	4 Channels
Resolution	16 bits
Sampling Rate	250 MSPS / per channel
Input Impedance	50 Ω
Coupling Method	DC Coupling
Input Voltage Range	2 Vpp
Analog Bandwidth	0 ~ 100 MHz
Bias Adjustment	±1V Adjustable
SFDR	Up to 88 dBc
Internal Storage	4 GB DDR4 Memory
Interface Type	PCI 3.0 x8 Interface
Data Upload Rate	≥ 2.2 GB/s
Demodulation Algorithm	Built-in IQ phase demodulation; can output raw or demodulated data
Trigger Output	Supports synchronous pulse output
System Compatibility	Windows / Linux

Application Fields

Oil, Gas & Underground Pipeline Integrity Monitoring: Quickly identifies anomalies such as leaks, impacts, and third-party interference.

Seismic & Geological Activity Detection: High-precision tracking of microseismic events and rock mass movements.

Large-Scale Infrastructure Health Monitoring: Used for detecting fatigue, cracks, and resonance in structures like bridges, dams, and high-speed rail tracks.

Underwater & Border Security Monitoring: Suitable for intrusion detection and potential target identification in complex environments.

Industrial Rotating Machinery Monitoring: Identifies abnormal vibrations, supporting predictive maintenance.