Optical Frequency Domain Reflectometry (OFDR) is a high-precision distributed fiber sensing technology based on the principle of frequency-domain interferometry, enabling sub-millimeter-level localization and quantitative sensing of minute strain and temperature variations along an optical fiber. The OFDR-KL9600 Distributed Fiber Sensing System, independently developed by Shanghai Kunlian Technology, employs a narrow linewidth, highly stable frequency-swept laser source. Combined with a high dynamic range interferometric receiver link and an adaptive Rayleigh scattering spectrum tracking algorithm, it significantly enhances the system's signal-to-noise ratio and measurement stability while maintaining extremely high spatial resolution.

In contrast to the pulsed ranging mechanism of traditional OTDR-based systems, OFDR utilizes a frequency-modulated laser to generate phase encoding across the scanning range. It performs Fourier inversion of the spectral structure of the interference signal in the frequency domain to obtain a Rayleigh scattering reflection profile along the fiber length. This profile serves as a unique "fingerprint" for each microscopic segment of the fiber. External minute perturbations (e.g., thermal expansion, structural strain) induce relative shifts in the scattering spectrum, which can be reconstructed in real-time through high-precision phase difference analysis.

Regarding core hardware design, the system integrates a high-linear tuning control module, a low-noise photodetector, a high-speed sampling AD conversion chain, and employs an FPGA+DSP multi-level co-processing architecture for real-time spectral reconstruction and dynamic filtering, effectively mitigating environmental disturbances and system drift. Its measurement accuracy, stability, and long-term repeatability have reached internationally advanced levels.

The OFDR-KL9600 Distributed Fiber Sensing System can be deployed on standard telecommunication single-mode fibers, requiring no dedicated sensing cables or nodes. It offers exceptional system integration flexibility and long-term operational reliability, making it an ideal solution for high-resolution structural health monitoring, research on material micro-properties, and precision engineering applications.

Core Features

✅ Ultra-high Spatial Resolution
Resolution up to 10 μm ~ 1 mm, far exceeding traditional distributed fiber sensing systems.

✅ High-Sensitivity Strain Detection
Minimum strain resolution down to 1 με, suitable for micro-stress variation monitoring.

✅ High-Stability Measurement System
Built-in temperature control and reference channel design effectively suppress drift and noise.

✅ Non-contact, Fully Distributed Sensing
Supports simultaneous multi-point/segment analysis, eliminating the need for multiple discrete sensors.

✅ Graphical Analysis Platform
Included PC software supports strain/temperature distribution maps, time-series comparison charts, and 3D heatmap visualization.