Fiber Optic Backscatter Sensing System With Selective Signal Processing
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Solution Overview
Problem
Traditional backscatter fiber optic sensing systems suffer from low sensitivity and signal fading over time, resulting in reduced performance and high noise levels, despite their cost-effectiveness and reliability advantages over interferometric systems.
Innovation Solution
A fiber optic sensing system that combines backscatter interrogation with high-performance transducers, using coherent light pulses to selectively process backscattered signals from specific regions of optical fibers, thereby enhancing sensitivity and reducing noise by excluding signal processing from non-transducer fiber segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional backscatter interrogation is used to interrogate backscatter optical signals from long lengths of optical fiber, then the system is extremely inexpensive to produce with low parts count, but the output signal fades over time resulting in low sensitivity and high noise levels
Solution Approach 1:
The patent divides the optical fiber into distinct segments: transducer fiber segments that contain the sensing elements and non-transducer fiber segments that do not. The system selectively processes backscattered signals only from the transducer fiber segments, excluding signals from non-transducer segments. This segmentation allows the system to maintain the cost-effectiveness of backscatter interrogation while improving sensitivity by filtering out noise from non-sensing portions of the fiber.
2Device complexity
If traditional backscatter interrogation processes all backscattered signals from the optical fiber, then the system结构简单 (simple structure), but signal fading occurs leading to reduced performance over time
Solution Approach 1:
The patent applies preliminary action by pre-processing the backscattered optical signals to identify and exclude signals originating from non-transducer fiber segments before further analysis. The system uses time-of-flight measurements to determine which segments the light has traversed and selectively processes only those signals from transducer segments. This preliminary filtering prevents signal fading issues from non-transducer portions from degrading system performance over time.
3Ease of manufacture
If backscatter systems use long lengths of optical fiber as simple sensor arrays, then the system is extremely inexpensive to produce, but the output is low sensitivity and scalar in nature
Solution Approach 1:
The patent applies local quality by making different portions of the optical fiber serve different functions. The transducer fiber segments are specifically designed with sensing capabilities (such as FBG elements or other transducer structures) to provide directional, high-sensitivity measurements, while the non-transducer fiber segments serve only as optical transmission paths. This local differentiation allows the system to maintain low manufacturing costs using long fiber lengths while achieving high sensitivity and directional measurement capabilities from the transducer segments.
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 achieves high directional sensitivity, low noise, and cost-effectiveness by processing only relevant backscattered signals, improving scale factor and off-axis sensitivity, while minimizing labor and component costs, thus overcoming the limitations of traditional backscatter systems.
Implementation Method 1
The optical signals may be provided as pulses of highly coherent light (e.g., laser light, having a duration between 1-100 nanoseconds)
Implementation Method 2
an optical backscatter interrogator for interrogating backscatter optical signals from the at least one fiber optic transducer
Implementation Method 3
Samples may be selected, for example, corresponding to light backscattered from the at least one fiber optic transducer based on the optical time of flight
Data Source
AI summary
A fiber optic sensing system is provided. The fiber optic sensing system includes: at least one fiber optic transducer; an optical backscatter interrogator for interrogating backscatter optical signals from the at least one fiber optic transducer; and an optical fiber between the optical backscatter interrogator and the at least one fiber optic transducer.