Compressed Sensing Brillouin Fiber Sensor Reducing Measurement Time
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Solution Overview
Problem
Existing Brillouin frequency domain distributed optical fiber sensors require a large number of repeated measurements to achieve high position resolution, which is inefficient and time-consuming.
Innovation Solution
A compressed sensing-based Brillouin frequency domain distributed optical fiber sensor device that uses a complex signal waveform with multiple frequency components, allowing for reduced measurements by leveraging compressed sensing techniques to restore signals from undersampled data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of repeated measurements is increased to improve position resolution, then measurement precision is improved, but measurement time and data acquisition duration increase
Solution Approach 1:
The patent applies compressed sensing theory to perform preliminary signal compression and sampling reduction before actual measurement. By pre-establishing a compressed sensing matrix and using sparsity assumptions about the Brillouin frequency domain signal, the system can reduce the number of required measurements while maintaining position resolution. The measurement matrix is designed in advance to enable reconstruction of the full signal from fewer samples.
Solution Approach 2:
The patent changes the sampling parameter from traditional uniform frequency sampling to compressed sensing-based non-uniform sampling. By transforming the measurement problem into a compressed sensing framework, the system can achieve the same position resolution with fewer measurement points. The signal processing unit reconstructs the full Brillouin frequency domain signal from these reduced measurements using iterative algorithms.
2Measurement precision
If pump light frequency is modulated differently to achieve high position resolution, then measurement precision is improved, but the number of repeated measurements increases
Solution Approach 1:
The system performs preliminary signal compression by designing a compressed sensing measurement matrix that captures the essential features of the Brillouin frequency domain signal. This preliminary action allows the system to achieve high position resolution without requiring exhaustive frequency modulation measurements, thereby improving measurement efficiency.
Solution Approach 2:
The patent creates a compressed copy of the full Brillouin frequency domain signal through compressed sensing. Instead of measuring all frequency components directly, the system measures a compressed version with fewer data points and then reconstructs the full signal. This copying approach maintains position resolution while significantly reducing the number of repeated measurements needed.
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 device significantly reduces the number of repeated measurements required for position resolution, achieving the same distance resolution and maximum measuring distance with fewer measurements, thereby improving efficiency and reducing data acquisition time.
Implementation Method 1
in the case of a method of measuring a physical quantity such as temperature or strain using a Brillouin scattered light scattered in a single-mode optical fiber
Data Source
AI summary
The present invention relates to a compressed sensing-based Brillouin frequency domain distributed optical fiber sensor device, and includes: a probe light generation unit that generates probe light using light output from a light source unit and transmits the probe light through one end of a sensing optical fiber; a compressed sensing light generation unit that generates compressed sensing light having a complex signal waveform, in which a plurality of different frequency signals are compressed, using the light output from the light source unit; an optical circulator that receives the compressed sensing light through an input terminal, transmits the same to an output terminal connected to the other end of the sensing optical fiber, and outputs, to a detection terminal, light scattered in the sensing optical fiber and incident through the output terminal; a light detection unit that detects Brillouin scattered light received through the detection terminal; a compressed sensing signal generation unit that generates a compressed sensing signal so that the compressed sensing light is generated; and a signal processing unit that controls the compressed sensing signal generation unit and calculates a temperature or strain for each position of the sensing optical fiber from a signal output from the light detection unit.