3D-Matrix Fiber Optic Demodulation System
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Solution Overview
Problem
Traditional demodulation systems for 3D-matrix multi-channel fiber optic sensing face limitations such as complex structures, high costs, and reduced spatial resolution, particularly in quasi-distributed sensing applications.
Innovation Solution
A demodulation system utilizing a wavelength swept optical source, optical frequency domain reflector, and balanced detector with frequency shifters and polarization controllers, enabling efficient measurement through interference signal detection and enhanced spatial resolution via Fast Fourier Transform processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional WDM, TDM, or FDM techniques are used for interrogating fiber optic sensors, then multi-channel sensing capability is achieved, but the system complexity and cost increase due to high-speed pulse modulators, frequency modulators, and high-bandwidth measurement systems
Solution Approach 1:
The patent extracts and removes the complex high-speed pulse modulators, frequency modulators, and high-bandwidth measurement systems from the traditional interrogation system, replacing them with a simplified direct detection approach that uses standard photodetectors and basic signal processing to achieve multi-channel sensing capability
Solution Approach 2:
The patent replaces expensive, complex modulator components with cheaper, simpler photodetector-based detection systems that can achieve the same multi-channel sensing function at lower cost and reduced system complexity
2Productivity
If traditional TDM and FDM techniques are used for sensor interrogation, then multi-channel sensing is enabled, but the measurement system becomes complicated requiring high-speed pulse modulators and frequency modulators
Solution Approach 1:
The patent substitutes the mechanical/electronic modulator systems (pulse modulators and frequency modulators) with an optical-based direct detection system using photodetectors and interferometric measurement techniques, thereby maintaining interrogation capability while eliminating the need for complex modulator hardware
Solution Approach 2:
The patent introduces an optical field as an intermediary medium, using optical interference patterns and photodetector signals to transmit sensor information without requiring complex electrical modulators, thus simplifying the measurement system while preserving multi-channel interrogation ability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system simplifies the demodulation process, reduces costs, and increases spatial resolution to the millimeter level, making it suitable for micro-scale quasi-distributed sensing systems.
Implementation Method 1
The interfering signal generated from the reflection light after passing through the optical frequency domain reflector is detected by the balanced detector
Implementation Method 2
an optical frequency domain reflector comprises a first optical path and a second optical path with a frequency shifter arranged on one or both of the optical paths
Implementation Method 3
The interfering signal generated from the reflection light after passing through the optical frequency domain reflector is detected by the balanced detector
Data Source
AI summary
A demodulation system for 3D-matrix multi-channel fiber optic sensing includes a wavelength swept optical source that generates an incident light, an optical frequency domain reflector and a balanced detector connected with the wavelength swept optical source through a fiber circulator. The optical frequency domain reflector includes a first optical path and a second optical path with a frequency shifter arranged on one or both of the optical paths. The optical frequency domain reflector outputs incident light to an optical switch module. The optical switch module selectively transmits the incident light to a sensor network as well as transmits the reflection light from the sensor network to the optical frequency domain reflector.