Optical Fiber Temperature Measurement ASE Correction
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Solution Overview
Problem
Existing optical fiber temperature distribution measuring devices face challenges in obtaining accurate measurements due to the influence of ASE light intensity variation, which affects the signal light intensity and makes it difficult to perform correct temperature distribution measurements, especially over long distances.
Innovation Solution
The optical fiber temperature distribution measuring device includes an ASE light intensity variation measurement unit and a temperature distribution correction unit that measures and corrects the ASE light intensity variation using an approximate expression calculation, allowing for accurate temperature distribution measurements by flattening the zero level of ASE light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If optical fiber temperature distribution measuring devices use amplified signal light to extend measurement range, then measurement distance is improved, but ASE light intensity variation causes measurement precision to deteriorate
Solution Approach 1:
The patent uses backward Raman scattered light as a feedback signal to measure ASE light intensity variation, then applies this measurement to correct the temperature distribution data. The system continuously monitors the ASE light intensity through Raman scattering and adjusts the temperature calculation accordingly, creating a closed-loop correction mechanism that maintains measurement precision over extended distances.
Solution Approach 2:
The patent introduces backward Raman scattered light as an intermediary to indirectly measure ASE light intensity variation. Instead of directly measuring ASE light, the system uses Raman scattered light which carries information about ASE intensity, then uses this intermediary measurement to correct temperature distribution data, enabling accurate long-distance measurements.
2Device complexity
If optical fiber temperature distribution measuring devices use conventional methods without ASE correction, then device complexity is reduced, but measurement precision deteriorates due to ASE light influence
Solution Approach 1:
The patent makes the temperature distribution measuring device multi-functional by enabling it to both measure temperature distribution and simultaneously measure ASE light intensity variation through backward Raman scattered light. This universal approach allows the same system to perform multiple measurements and apply self-correction without requiring separate dedicated correction equipment.
Solution Approach 2:
The system performs self-correction by using its own backward Raman scattered light measurements to detect and compensate for ASE light intensity variation. The device serves itself by generating the correction data internally through the same measurement path, eliminating the need for external correction systems or additional complexity.
Data Source
AI summary
An optical fiber temperature distribution measuring device includes: an optical fiber as a sensor; a light source for outputting, to the optical fiber, signal light which has been amplified by excitation light; a temperature distribution calculation unit for measuring a temperature distribution along the optical fiber by using backward Raman scattered light from the optical fiber; an ASE light intensity variation measurement unit for measuring an intensity variation of an ASE light generated at the light source; and a temperature distribution correction unit for correcting the temperature distribution based on a measurement result of the ASE light intensity variation measurement unit.