Single-Fiber LIBS Probe for Vacuum Degree Detection
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Solution Overview
Problem
Current online detection methods for vacuum degree in vacuum arc-extinguishing chambers are lacking, as existing fiber LIBS systems suffer from low laser power, low transmission efficiency, and high noise interference, leading to low measurement accuracy.
Innovation Solution
An online vacuum degree detection system based on single-fiber laser-induced breakdown spectroscopy (LIBS) is developed, which includes a laser device, fiber coupler, single fiber, LIBS probe, dichroscope, achromatic instrument, collection fiber, spectrometer, ICCD camera, and processor to improve laser focusing, stability, and reduce noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fiber LIBS system is used for remote online detection, then detection accessibility and adaptability are improved, but laser transmission power and spectral signal-to-noise ratio decrease
Solution Approach 1:
The system divides the optical fiber into multiple segments: transmission fiber for delivering laser energy, collection fiber for gathering plasma emission, and probe fiber for localized plasma generation. This segmentation allows optimization of each fiber segment's function, maintaining laser power while enabling remote detection access.
Solution Approach 2:
The patent introduces a probe structure as an intermediary between the fiber endpoint and the vacuum chamber wall. The probe concentrates laser energy at its tip to generate plasma, while the collection fiber collects emission from this localized plasma region. This intermediary structure compensates for laser power loss during transmission and enhances spectral signal-to-noise ratio.
2Adaptability or versatility
If fiber LIBS system is used for remote online detection, then detection accessibility and adaptability are improved, but spectral signal-to-noise ratio decreases
Solution Approach 1:
The system concentrates laser energy and plasma emission collection in a localized region at the probe tip or fiber endpoint within the vacuum chamber. By focusing the laser through the fiber to a small spot and collecting plasma emission from this localized region, the system enhances spectral signal intensity and improves signal-to-noise ratio despite the remote detection configuration.
Solution Approach 2:
The patent employs curved or focused fiber configurations, where the collection fiber is positioned to optimally collect plasma emission from the generation region. This curved geometry enhances the collection efficiency of spectral signals, improving the signal-to-noise ratio for remote online detection applications.
3Measurement precision
If offline detection methods are used, then detection accuracy can be maintained, but equipment must be taken out of running state
Solution Approach 1:
The patent replaces traditional mechanical offline detection methods with an optical-based fiber LIBS system. By using laser-induced plasma and collecting spectral emission through optical fibers, the system enables non-contact, online measurement of vacuum degree without requiring mechanical access or equipment shutdown, thus maintaining detection accuracy while improving equipment availability.
Solution Approach 2:
The fiber LIBS probe is designed to perform multiple functions: laser transmission, plasma generation, and spectral emission collection, all through a single integrated probe structure. This multi-functional design enables continuous online monitoring of vacuum degree in various vacuum switch types without requiring different detection systems, maintaining measurement precision across applications while ensuring continuous operation.
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 achieves high repeatability and accuracy in vacuum degree detection by enhancing plasma imaging and spectral signal-to-noise ratio, allowing for remote online monitoring of vacuum switch equipment even in harsh environments.
Implementation Method 1
an online vacuum degree detection system and method based on single-fiber laser-induced breakdown spectroscopy
Implementation Method 2
a laser device, which generates laser that excites the laser through fiber induced breakdown spectroscopy
Implementation Method 3
the plasma is subjected to self-emission imaging and enters the fiber coupler via the LIBS probe
Implementation Method 4
a dichroscope, which is arranged on the fiber coupler to separate the laser from the plasma
Data Source
AI summary
Disclosed are an online vacuum degree detection system and method based on single-fiber laser-induced breakdown spectroscopy. In the system, a laser device generates laser that excites the laser through fiber induced breakdown spectroscopy; a fiber coupler couples and injects the laser; a single fiber is connected to the fiber coupler to transmit the laser; one end of an LIBS probe is connected to the single fiber, and the other end of the LIBS probe extends into a vacuum arc-extinguishing chamber; the laser is induced by the LIBS probe to generate plasma, and the plasma is subjected to self-emission imaging and enters the fiber coupler via the LIBS probe; a dichroscope is arranged on the fiber coupler to separate the laser from the plasma; a processor is connected to a camera and a spectrometer.