Ultra-weak grating DAS demodulation module

1.Basic principles and product introduction

   The laser emits optical pulses along the optical fiber, directional reflection at the grating position, interferes after phase compensation, and carries the vibration information along the optical fiber, and forms a data matrix after collection and processing, extracting the frequency, phase and amplitude information of the vibration signal. The module has a built-in high-performance ARM chip, with a high degree of integration of optical,mechanical and electrical, and uses parallel demodulation algorithms to process massive data at the bottom layer, accurately obtain vibration information at different positions on the optical fiber, and transmit back through Ethernet. This technology has been recognized as"the most confident distributed sound wave measurement and the world's highest sensitivity" optical fiber sensing technology.

2.Product advantages

(1)High sensitivity,up to 0.5nε.

(2)High signal-to-noise ratio, fast demodulation speed, and high real-time performance.

(3)Can be extended to multiple channels to achieve centralized testing of multiple measurement lines.

(4)Long term stability and high reliability.

(5)Adopting modular design, the system has low power consumption and simple field testing and networking.

3.Typical applications

(1)Structural health monitoring of large tunnels,railways, highways, dams, etc.

(2)Monitoring of vehicle trajectory location, pipeline leakage,oil and gas extraction,boundary intrusion,etc.

(3)Reduction analysis of sound field signals.

4.Product indicators