Fiber Optic Voltage Conditioner for Structural Health Monitoring
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Solution Overview
Problem
Conventional fiber optic voltage conditioners are too expensive or heavy for real-time structural health monitoring applications, and they do not provide sufficient performance for demanding structural health monitoring tasks, particularly when using optical sensors.
Innovation Solution
A patch structure for a fiber optic cable with an acoustic interface layer to reduce stress wave coupling loss, coupled with a fiber optic voltage conditioner that includes a tunable light source to provide a narrowband light signal for optical communication, allowing for efficient fiber optic voltage conditioning and integration with fiber Bragg grating sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fiber optic voltage conditioners are used, then sufficient performance for structural health monitoring is achieved, but the system becomes too expensive and heavy
Solution Approach 1:
The patent replaces conventional electronic voltage conditioners with an optical-based fiber optic voltage conditioner that uses optical sensors (Fiber Bragg Grating sensors) and optical signal processing. This substitution of mechanical/electronic systems with optical systems achieves the desired performance while significantly reducing weight and cost, as optical components are inherently lighter and can be integrated more compactly into the monitoring system.
2Reliability
If conventional fiber optic voltage conditioners are used, then sufficient performance for structural health monitoring is achieved, but the system becomes too expensive
Solution Approach 1:
The fiber optic voltage conditioner is designed with multi-functionality, capable of measuring multiple parameters simultaneously including voltage, strain, temperature, and acoustic emissions through a single integrated optical sensor system. This universal approach eliminates the need for separate sensors and conditioners for each parameter, thereby reducing overall system cost while maintaining sufficient performance across all measurement functions.
Solution Approach 2:
The patent uses Fiber Bragg Grating (FBG) sensors that can be mass-produced through standard fiber optic manufacturing processes. These optical sensors can be replicated and multiplexed along a single fiber cable, allowing multiple measurement points to be monitored using identical, cost-effective optical components rather than expensive electronic sensors, thus reducing overall system cost.
3Measurement precision
If optical sensors are used for structural health monitoring, then high performance is achieved, but fiber optic voltage conditioning becomes complex and costly
Solution Approach 1:
The patent extracts the voltage conditioning function from complex electronic circuitry and implements it directly through optical domain processing using Fiber Bragg Grating sensors. The FBG sensors inherently provide wavelength-based measurement that is naturally immune to electromagnetic interference, eliminating the need for complex electronic shielding, grounding, and signal conditioning circuits, thereby simplifying the overall voltage conditioning system while maintaining high measurement precision.
4Productivity
If Fiber Bragg Grating sensors are used, then real-time structural health monitoring is achieved, but stress wave coupling loss occurs at the interface
Solution Approach 1:
The patent introduces an acoustic interface layer as an intermediary between the fiber optic sensor and the host structure surface. This intermediate layer serves as an acoustic impedance matcher that improves the coupling of stress waves from the structure into the fiber optic sensor, thereby reducing energy loss and enhancing the real-time monitoring capability for acoustic emissions and vibration measurements.
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 solution enables effective fiber optic voltage conditioning, reducing the weight and cost of the system while providing high-performance structural health monitoring capabilities, including real-time load, vibration, and acoustic emission measurements, and can be used for various applications such as monitoring helicopter blades, wind turbines, and other rotating objects.
Implementation Method 1
An acoustic interface layer is coupled to a surface of the housing to reduce stress wave coupling loss at an interface between the at least one fiber optic sensor and a host structure surface
Implementation Method 2
The fiber optic voltage conditioner includes a tunable light source having a broadband light source or a gain medium configured to provide a narrowband light signal from a broadband light signal for providing to the fiber optic cable
Implementation Method 3
the fiber optic voltage conditioner is coupled for optical communication to a fiber optic cable having a Fiber Bragg Grating sensor
Data Source
AI summary
Apparatuses relate generally to a fiber optic cable. In such an apparatus, a housing has a channel or bore for receipt of a portion of the fiber optic cable having a fiber optic sensor. An acoustic interface layer is coupled to a surface of the housing to reduce stress wave coupling loss at an interface between the fiber optic sensor and a host structure surface. In another such apparatus, a patch structure is for a fiber optic cable coupled to a fiber optic voltage conditioner. In yet another such apparatus, a fiber optic voltage conditioner is coupled for optical communication to a fiber optic cable having a Fiber Bragg Grating sensor. The fiber optic voltage conditioner includes a tunable light source having a broadband light source or a gain medium configured to provide a narrowband light signal from a broadband light signal for providing to the fiber optic cable.