Close-Coupled Laser Analyzer for Multi-Compound Gas Detection
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Solution Overview
Problem
Existing gas analysis systems are inefficient, bulky, and prone to cross-interference effects, particularly when measuring multiple compounds, requiring multiple instruments and being sensitive to atmospheric impurities.
Innovation Solution
A compact laser detection system with a close-coupling arrangement of lasers, optical components, and detectors within a sealed sample chamber, minimizing exposure to atmospheric air and using pulsed laser beams to reduce interference, allowing simultaneous measurement of multiple gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate continuous emission monitoring instruments are installed to measure multiple compounds, then measurement capability for multiple compounds is improved, but device complexity and space requirements worsen
Solution Approach 1:
The patent implements a single laser detection system capable of measuring multiple gas compounds (CO2, CO, CH4, H2O, O2, NO, NO2, SO2) by using multiple lasers with different wavelengths and detectors. The system uses a common optical path and shared components to achieve multi-functionality, eliminating the need for multiple separate instruments while maintaining measurement capability for various compounds
2Volume of moving object
If optical cells and optical components are arranged to make the system compact, then system size is reduced, but alignment precision and measurement reliability worsen
Solution Approach 1:
The patent places the optical cell inside the laser housing, creating a nested arrangement where the optical cell is contained within the same housing as the laser source. This integration minimizes the overall system volume while maintaining proper optical alignment, as the optical path is contained within the sealed housing and does not require external alignment mechanisms
3Measurement precision
If purge systems or chemical scrubbers are used to address cross-interference from atmospheric air, then measurement accuracy for atmospheric impurities is improved, but device complexity and utility requirements worsen
Solution Approach 1:
The patent extracts the optical path from the external atmospheric environment by sealing it within the laser housing. The optical cell is contained inside the housing with the laser, creating a closed optical path that prevents atmospheric air from entering and causing cross-interference. This eliminates the need for purge systems or chemical scrubbers while maintaining measurement accuracy for atmospheric impurities
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 provides reliable, compact, and efficient multi-compound gas analysis with reduced interference, enabling accurate measurement of gases like ethylene, H2, N2, CO2, and O2, without the need for additional purge systems or complex software corrections.
Implementation Method 1
a laser detection system for detecting the presence or amounts of specified gases, for example a system for gas analysis based on laser absorption spectroscopy
Data Source
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AI summary
A laser detection system comprising a sample chamber configured to receive and contain a volume of sample gas; one or more lasers within at least one laser housing, wherein each laser is configured to produce a respective laser beam for excitation of one or more different materials in the sample gas and the one or more lasers are outside the sample chamber; a detector apparatus for detecting light output from the sample chamber; a first optical interface to the sample chamber having at least one window that is at least partially transparent to the laser beams from the one or more lasers, wherein the at least one laser housing is positioned in a close-coupling arrangement relative to the at least one window of the first optical interface such that, in use, the laser beams are substantially unmodified by passage between the laser housing and the at least one window.