Optical Fiber Temperature Measurement Noise Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing temperature measurement devices using back-scattering light in optical fibers face challenges in accurately measuring temperature distribution due to noise interference, particularly when the optical fiber path is bent or when using single-end methods, which degrade measurement accuracy and introduce noise.
Innovation Solution
A temperature measurement device that includes an optical fiber with a light source, a measurer to detect temperature distribution based on back-scattering light, and a corrector that applies a filter to reduce noise by comparing temperature data from different regions or ends of the optical fiber, using a low-pass filter or adaptive filter to suppress high-frequency noise components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If back-scattering light method is used for temperature measurement, then temperature distribution can be measured along optical fiber path, but noise interference degrades measurement accuracy
Solution Approach 1:
The patent creates a virtual copy of the temperature distribution by measuring from both ends of the optical fiber and combining the measurements. The mirror-image processing generates a synthetic temperature profile that cancels out noise components, effectively using the fiber itself to create a reference copy for noise cancellation.
Solution Approach 2:
The patent converts the harmful noise interference into a beneficial filtering mechanism. By processing temperature measurements from both ends and creating mirror images, the system identifies and eliminates noise components, transforming the problematic noise into useful information for improving measurement accuracy.
2Device complexity
If optical fiber path is bent or single-end method is used, then device complexity is reduced, but measurement accuracy deteriorates due to increased noise
Solution Approach 1:
The patent applies mirror-image processing to create a virtual copy of the temperature distribution from the opposite end. This copying approach allows the system to maintain simplicity while achieving noise cancellation, as the processing is performed computationally rather than requiring additional physical measurement equipment.
Solution Approach 2:
The patent inverts the measurement approach by measuring from both ends of the optical fiber and processing the data in reverse (mirror-image). This inversion strategy enables noise cancellation without increasing physical device complexity, as the dual-end measurement approach is processed through computational mirroring.
3Measurement precision
If filter is applied to reduce noise, then measurement accuracy is improved, but high-frequency temperature variations may be suppressed
Solution Approach 1:
The patent uses mirror-image copying to create a reference temperature profile that contains the same high-frequency variations. By combining the original and copied profiles, the system preserves high-frequency temperature information while canceling out noise, avoiding the information loss that would occur with traditional filtering.
Solution Approach 2:
The patent converts the potential loss of high-frequency information into a benefit by using the mirror-image processing to identify and preserve genuine temperature variations. The method distinguishes between noise and actual high-frequency temperature changes, retaining the latter while eliminating the former.
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 effectively reduces noise interference, enhancing temperature measurement accuracy and resolution by canceling out noise components, resulting in smoother temperature profiles and reduced standard deviation along the optical fiber path.
Implementation Method 1
an optical fiber that is arranged along a predetermined path; a light source configured to input a light into the optical fiber
Implementation Method 2
a measurer configured to measure temperature distribution information in an extension direction of the optical fiber based on a back-scattering light from the optical fiber
Data Source
AI summary
A temperature measurement device includes: an optical fiber that is arranged along a predetermined path; a light source configured to input a light into the optical fiber; a measurer configured to measure temperature distribution information in an extension direction of the optical fiber based on a back-scattering light from the optical fiber; and a corrector configured to make a filter for reducing a noise component of temperature distribution information measured by the measurer based on a difference of temperature distribution information between two different regions of the optical fiber in which a common temperature distribution is obtained, and correct the temperature distribution information by applying the filter to the temperature distribution information.