Pulse Laser Optical Fiber Sensor System for Multi-Point Measurement
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Solution Overview
Problem
Existing optical fiber sensor systems using optical fiber gratings face complex analysis of response light for measuring physical quantities across multiple sensing points, making it difficult to efficiently measure and analyze data.
Innovation Solution
An optical fiber sensor system employing a pulse laser generator, which includes a pulse laser generator, a main optical coupler, a reference optical fiber, a multi-point sensing optical fiber unit, an optical detection unit, and a diagnosis processing unit, facilitating the measurement of physical quantities across multiple points by simplifying light analysis through the use of a pulse laser and dispersion compensation scanning unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical fiber grating is used to measure deformation, then measurement capability for multiple points is achieved, but analysis of response light becomes complex
Solution Approach 1:
The patent changes the light source parameter from continuous wave to pulsed laser, and introduces time delay as a new parameter to identify different sensing points. This allows multiple measurement points to be distinguished by their response time rather than requiring complex wavelength analysis, thereby simplifying the analysis process while maintaining multi-point measurement capability
Solution Approach 2:
The patent employs periodic pulsed laser illumination to sequentially excite different sensing points along the optical fiber. Each sensing point reflects light at different time intervals, creating a time-coded response that simplifies identification and analysis compared to simultaneous continuous wavelength analysis
2Measurement precision
If optical fiber grating method is used, then physical quantity measurement is enabled, but response light analysis becomes complex
Solution Approach 1:
The patent introduces time delay as an intermediary parameter to mediate between the physical quantity measurement and the detection process. Instead of directly analyzing complex wavelength shifts, the system uses time-delayed reflections from pulsed laser to encode spatial information, making the detection process simpler while preserving measurement precision
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 enables simplified analysis of light input to the optical detection unit, allowing for efficient measurement of physical quantities across multiple points, thereby simplifying the analysis process and improving data collection efficiency.
Implementation Method 1
an optical fiber resonator that forms a ring type resonator using the optical fiber so that light supplied from the pumping light source resonates while being circulated through the amplification optical fiber
Implementation Method 2
an amplification optical fiber doped with ytterbium or erbium that amplifies light made incident from the pumping light source
Implementation Method 3
a main optical coupler that receives the pulse laser light generated and outputted from the pulse laser generator from a first input terminal, branches the received light to a first output terminal and a second output terminal to output the branched light
Implementation Method 4
a reference optical fiber that is connected to the first output terminal and reflects light input through the main optical coupler to provide a reference optical signal
Implementation Method 5
an optical detection unit that converts an optical signal input through the third output terminal into an electrical signal
Implementation Method 6
a dispersion compensation scanning unit that is coupled to both ends of the optical fiber resonator to compensate for dispersion of input light so that a pulse width is adjusted narrow
Data Source
AI summary
Disclosed are a pulse laser generator and an optical fiber sensor system using the same. The optical fiber sensor system includes a main optical coupler that receives pulse laser light generated from a pulse laser generator from a first input terminal, branches the light to first and second output terminals to output, and outputs, through a third output terminal, light input reversely from the first and second output terminals, a reference optical fiber that is connected to the first output terminal, a multi-point sensing optical fiber unit that is connected to the second output terminal, and in which optical fibers are connected in series or in parallel corresponding to a plurality of sensing points, an optical detection unit that is connected to the third output terminal, and a diagnosis processing unit that detects a change of the physical quantity for the sensing points from signals from the optical detection unit.