Fiber Bragg Grating Sensor Identification in PON Gas Monitoring
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Solution Overview
Problem
In optical fiber-based remote gas leakage monitoring systems, identifying individual gas sensors in a PON setting is challenging due to similar round-trip times and overlapping probe signals from multiple sensors, limiting the system's capability and applicability in existing network infrastructures.
Innovation Solution
The use of fiber Bragg gratings with distinct grating patterns at each sensor head allows for differentiation of probe signals by reflecting specific wavelengths, enabling the analyzer to identify multiple sensors within the network, even when distances and signal paths are similar, by converting optical signals to electrical form for processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple gas sensors are deployed in a PON network, then the monitoring coverage is improved, but the sensor identification becomes difficult due to similar round-trip times and overlapping probe signals
Solution Approach 1:
The patent assigns different local qualities (distinct grating patterns) to each sensor's fiber Bragg grating, enabling individual identification. Each sensor reflects probe signals at specific wavelengths determined by its unique grating pattern, allowing the analyzer to distinguish between multiple sensors even when their round-trip times are similar, thus maintaining both monitoring coverage and identification accuracy
Solution Approach 2:
The patent transitions from one-dimensional identification (based on round-trip time only) to multi-dimensional identification by incorporating wavelength as an additional dimension. The fiber Bragg grating reflects probe signals at specific wavelengths, creating a two-dimensional identification space (time + wavelength) that enables precise sensor identification in multi-sensor PON networks
2Reliability
If one optical fiber line is used for one sensor, then the sensor identification problem is avoided, but the network infrastructure utilization is severely limited
Solution Approach 1:
The patent makes the optical fiber line universal by enabling it to serve multiple sensors simultaneously through wavelength division multiplexing. The fiber Bragg grating at each sensor reflects specific wavelengths, allowing multiple sensors to share the same fiber infrastructure while maintaining reliable identification, thus achieving both high reliability and versatile network utilization
Solution Approach 2:
The patent changes the wavelength parameter of the probe signal to enable multiple sensors to operate on the same fiber. By assigning different reflection wavelengths to each sensor's fiber Bragg grating, the system transforms a single-parameter (time) identification system into a multi-parameter (time + wavelength) system, allowing efficient use of existing fiber infrastructure
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
This solution allows for accurate identification and monitoring of multiple gas sensors, enabling continuous and cost-effective methane gas leakage detection without inducing monitoring point identification errors, suitable for existing PON infrastructure with reduced maintenance and installation complexity.
Implementation Method 1
The use of fiber Bragg gratings with distinct grating patterns at each sensor head allows for differentiation of probe signals by reflecting specific wavelengths
Implementation Method 2
the probe signal from the sensor can be converted from optical to electrical form to be processed by the analyzer
Data Source
AI summary
An analyzer operable with an optical network is responsive to a probe signal reflected by a sensor in the network to convey information about targeted matter in air in the sensor. Multiple sensors at different locations in the network can be associated with respective selective optical wavelength filtering thereby enabling the analyzer to associated respective ones of the sensors.