---
title: Technology — FBG & DAS Fiber Optic Sensing | DuyuSense
url: https://www.duyusense.com/en/technology
---

[Home](https://www.duyusense.com/en/) / Technology Technology

# Turn light in a fiber into measurement

DuyuSense interrogates the light travelling through standard optical fiber to detect strain, temperature and vibration along its entire length — with FBG and DAS at the core.

## From light pulse to actionable insight

### Light source

A laser launches precisely controlled light pulses into the optical fiber.

### Fiber as a sensor

Micro-changes from strain, heat or vibration alter how the light reflects and scatters along the cable.

### Interrogation

Our interrogators read these optical changes at high speed and high resolution — even over long distances.

### Real-time analytics

Signal-processing algorithms convert raw optical data into events, locations and alerts.        Core technology

## Fiber Bragg Grating (FBG)

A Fiber Bragg Grating reflects specific wavelengths of light that shift with strain and temperature. We have developed proprietary FBG sensors with enhanced sensitivity and durability, together with a novel interrogation system for real-time, high-speed measurement.

### Highlights

- Enhanced sensitivity and long-term durability
- Real-time, high-speed measurement
- Reliable in harsh environments
- Strain and temperature sensing
- Ideal for structural health monitoring
Core technology

## Distributed Acoustic Sensing (DAS)

DAS turns an ordinary telecom fiber into thousands of virtual vibration sensors. Our patented systems improve spatial resolution and signal-to-noise ratio, while an advanced signal-processing algorithm reduces noise and improves event-detection accuracy.

### Highlights

- Patented, high spatial resolution
- Improved signal-to-noise ratio
- Advanced noise-reducing algorithms
- Pipeline, perimeter and seismic monitoring
- Long-distance event detection
Innovation

## Patents that set us apart

These innovations position DuyuSense at the forefront of the fiber optic sensing industry, enabling unparalleled solutions to complex sensing challenges.  01

### FBG interrogation system

A novel interrogation system allowing real-time, high-speed measurements in harsh environments. 02

### DAS signal processing

An advanced algorithm that significantly reduces noise and improves event-detection accuracy. 03

### R&D and prototyping

Continuous research and rapid prototyping that bridge academic discovery and field-ready products.

## Engineering capabilities

### Sensor development

Custom FBG sensor design, packaging and characterization.

### Interrogation & signaling

High-speed interrogators and signaling consultancy.

### Prototype development

From concept to manufactured, field-tested prototype.

### System engineering

End-to-end integration for complex monitoring systems.

## Quick questions, direct answers

### Which fiber optic sensing technologies does DuyuSense use?

DuyuSense works with Fiber Bragg Grating (FBG) and Distributed Acoustic Sensing (DAS). FBG measures strain and temperature with high precision at defined points; DAS turns an entire fiber, kilometres long, into a continuous vibration sensor. We hold patents in both areas.

### What do DuyuSense's patents cover?

Our patents cover two core areas: an FBG interrogation system for real-time, high-speed measurement in harsh environments, and a DAS signal-processing algorithm that significantly reduces noise and improves event-detection accuracy.

### Can existing telecom fiber be used as a sensor?

For DAS, yes: standard single-mode telecom fiber becomes a sensor once an interrogator is connected at one end, with no electronics in the field. FBG needs gratings written into the fiber, so dedicated FBG sensors are installed at the measurement points.

### Should I choose FBG or DAS?

Choose FBG when you need precise strain or temperature at known points, and DAS when you need continuous vibration and event detection along a long route. Many projects combine both. See our DAS vs FBG guide for details.

## Ready for fiber sensor solutions?

Our technology tracks heat, bending and strain across railways, borders, building integrity and aviation — and our team is ready for B2B collaboration and project partnerships.  [Contact for details](https://www.duyusense.com/en/contact) [Browse applications](https://www.duyusense.com/en/applications)