Distributed Optical Fiber Sensor Simultaneous Strain Temperature
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Solution Overview
Problem
Current distributed optical fiber sensors using the Brillouin scattering phenomenon can only measure either strain or temperature simultaneously, but not both independently with high spatial resolution due to limitations in spatial resolution and the inability to distinguish between strain and temperature changes.
Innovation Solution
A distributed optical fiber sensor system that combines Brillouin and Rayleigh scattering phenomena to measure both strain and temperature simultaneously and independently, utilizing a Brillouin measuring unit, a Rayleigh measuring unit, and a calculation unit to process frequency shifts from both phenomena for precise spatial resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Brillouin scattering phenomenon is used for measurement, then strain and temperature can be detected, but only one parameter can be measured simultaneously with high precision
Solution Approach 1:
The patent combines Brillouin scattering measurement and Rayleigh scattering measurement into a single optical fiber sensor system. By merging these two measurement methods, the system can simultaneously determine both strain and temperature independently, resolving the limitation of measuring only one parameter at a time while maintaining high precision for both parameters
Solution Approach 2:
The patent uses a composite measurement approach by combining information from two different scattering phenomena (Brillouin and Rayleigh). This composite measurement strategy allows the system to extract both strain and temperature data from the optical fiber, effectively creating a multi-functional sensing capability from a single sensor system
2Measurement precision
If spatial resolution is improved, then measurement accuracy increases, but the ability to distinguish between strain and temperature changes deteriorates
Solution Approach 1:
The patent segments the measurement information by utilizing two distinct scattering phenomena (Brillouin and Rayleigh) that provide different information about the optical fiber's state. By segmenting the measurement approach in this way, the system can independently determine both strain and temperature without losing the ability to distinguish between them, even at high spatial resolutions
3Device complexity
If single scattering phenomenon is used, then measurement system is simple, but measurement versatility is limited
Solution Approach 1:
The patent makes the optical fiber sensor multi-functional by enabling it to perform both Brillouin scattering measurement and Rayleigh scattering measurement. This universal sensor can detect both strain and temperature independently, transforming a single optical fiber into a multi-parameter sensing device without requiring separate sensors for each parameter
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
Enables simultaneous and independent measurement of strain and temperature with high spatial resolution, improving measurement precision and accuracy by leveraging the distinct frequency shifts from Brillouin and Rayleigh scattering.
Implementation Method 1
measuring a Brillouin frequency shift amount caused by a strain and a temperature generated in the optical fiber by using a Brillouin scattering phenomenon
Implementation Method 2
measuring a Rayleigh frequency shift amount caused by the strain and temperature generated in the optical fiber by using a Rayleigh scattering phenomenon
Data Source
AI summary
The present invention provides a distributed optical fiber sensor capable of measuring the strain and temperature of an object to be measured simultaneously and independently with high spatial resolution. A distributed optical fiber sensor FS is a distributed optical fiber sensor which uses an optical fiber 15 as a sensor, and a strain and temperature detector 14 measures a Brillouin frequency shift amount caused by a strain and a temperature generated in the optical fiber 15 by using a Brillouin scattering phenomenon, measures a Rayleigh frequency shift amount caused by the strain and temperature generated in the optical fiber 15 by using a Rayleigh scattering phenomenon, and calculates the strain and temperature generated in the optical fiber 15 from the measured Brillouin frequency shift amount and Rayleigh frequency shift amount.