Optical Fiber Measurement Device Brillouin Gain Spectrum Segmentation
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Solution Overview
Problem
Existing BOCDR-type optical fiber characteristic measurement devices face challenges in accurately measuring large strains and temperature changes due to the dominance of the background light spectrum in the Brillouin gain spectrum, leading to erroneous measurements.
Innovation Solution
The proposed solution involves an optical fiber characteristic measurement device that obtains both a first Brillouin gain spectrum with a narrow spectral width and a second Brillouin gain spectrum with a wider spectral width, allowing for the differentiation between foreground and background light spectra and accurate measurement of strain and temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single Brillouin gain spectrum is obtained using conventional BOCDR methods, then the measurement process is simple, but the measurement precision deteriorates when large strains or temperature changes occur due to background light spectrum dominance
Solution Approach 1:
The patent segments the Brillouin gain spectrum acquisition into multiple spectra with different spectral widths (narrow and wide). By obtaining both a first Brillouin gain spectrum with a first spectral width and a second Brillouin gain spectrum with a second spectral width, the system can differentiate between foreground and background light spectra, resolving the measurement precision issue without excessive complexity
Solution Approach 2:
The patent changes the spectral width parameter of the incident light to acquire different Brillouin gain spectra. By adjusting the spectral width parameter, the system can obtain spectra that are suitable for different measurement conditions, enabling accurate strain and temperature measurements while maintaining manageable system complexity
2Adaptability or versatility
If the spectral width of incident light is increased to capture background light spectrum, then the measurement coverage improves, but the measurement precision deteriorates due to background light dominance
Solution Approach 1:
The patent segments the measurement approach by obtaining multiple Brillouin gain spectra with different spectral widths. This allows the system to capture both foreground and background light spectra characteristics, enabling accurate differentiation and measurement across various strain and temperature conditions
Solution Approach 2:
The patent adds a dimension to the measurement by acquiring spectra at multiple spectral widths. This dimensional expansion allows the system to analyze the relationship between foreground and background light spectra, improving both measurement coverage and precision simultaneously
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 approach enables precise measurement of large strains and temperature changes without errors, improving the accuracy of optical fiber characteristic measurements.
Implementation Method 1
causes pump light which is frequency-modulated light to be incident from one end of an optical fiber under test, and detects the result obtained by causing Brillouin scattered light emitted from the one end of the optical fiber under test and reference light (light of which the frequency is modulated in the same manner as the pump light) to interfere with each other
Implementation Method 2
detects the result obtained by causing Brillouin scattered light emitted from the one end of the optical fiber under test and reference light (light of which the frequency is modulated in the same manner as the pump light) to interfere with each other
Data Source
AI summary
An optical fiber characteristic measurement device (1) includes a light detector (16) configured to detect Brillouin scattered light (LS) obtained by causing light to be incident on an optical fiber (FUT); a signal processor (18b) configured to obtain, on the basis of a detection signal (S1) which is output from the light detector, a first Brillouin gain spectrum (B1) which is a spectrum of the Brillouin scattered light obtained in a case where a spectral width of the light incident on the optical fiber is a first width and a second Brillouin gain spectrum (B2) which is a spectrum of the Brillouin scattered light obtained in a case where the spectral width of the light incident on the optical fiber is a second width larger than the first width; and a measurer (18c) configured to measure characteristics of the optical fiber on the basis of the first Brillouin gain spectrum and the second Brillouin gain spectrum.