Segmented Optical Gas Concentration Measurement for Trace Detection
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Solution Overview
Problem
Existing gas analysis methods, such as chromatography, mass spectroscopy, and electrochemical-based systems, are expensive, complex, and unsuitable for real-time analysis, while optical gas analyzers face limitations in detecting small concentrations due to limited optical beam length and beam divergence issues.
Innovation Solution
A system using a series of electronically linked light sensors and sources to pass light through a sample multiple times, measuring cumulative intensity changes to determine adsorption and concentration, allowing for extended optical length without physical constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single optical beam is used in conventional gas analyzers, then the device structure is simple, but the detection precision for small gas concentrations is insufficient due to limited optical beam length
Solution Approach 1:
The optical measurement system is segmented into multiple independent light sources and light sensors arranged in series. Each light source-sensor pair acts as an independent measurement unit, and their effects are cumulative. This segmentation allows extending the effective optical path length without requiring a single extremely long beam, thereby improving detection precision for small gas concentrations while maintaining manageable device complexity.
2Measurement precision
If the optical beam length is extended to detect small concentrations, then the measurement precision improves, but beam divergence increases causing measurement errors
Solution Approach 1:
By dividing the optical path into multiple short-segment measurements rather than one long continuous beam, the patent avoids beam divergence accumulation. Each segment uses a short optical path where divergence is minimal, yet the cumulative effect of multiple segments provides the equivalent sensitivity of a long path, eliminating the harmful divergence effect.
Solution Approach 2:
The patent introduces intermediate light sensors that act as mediators between light sources. Each sensor receives light from its corresponding source, measures the intensity change due to gas absorption, and effectively resets the optical path for the next segment. This intermediary approach prevents direct propagation of a long beam that would suffer from divergence.
3Measurement precision
If chromatography or mass spectroscopy is used, then the measurement precision is high, but the device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex mechanical separation systems (chromatography columns, mass spectrometers) with a simplified optical measurement system. By using multiple light source-sensor pairs to achieve high measurement precision through cumulative optical absorption measurements, the system eliminates the need for expensive and complex chromatographic or mass spectrometric equipment while maintaining high detection accuracy.
4Measurement precision
If electrochemical sensors are used, then the sensitivity is high, but frequent calibration and servicing are required
Solution Approach 1:
The optical system uses stable light sources (such as LEDs or laser diodes) and light sensors with inherently stable characteristics that do not require frequent calibration. The system essentially serves itself by relying on the fundamental physical law of light absorption, which is consistent and reproducible, eliminating the need for regular calibration and servicing that electrochemical sensors require.
Solution Approach 2:
The patent changes the measurement parameter from electrochemical reactions (which drift and require calibration) to optical absorption parameters (which are based on fundamental constants). By measuring light intensity changes at specific wavelengths absorbed by the gas, the system achieves stable, drift-free measurements that do not require frequent calibration, improving ease of 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
Enables accurate and stable detection of small gas concentrations with quick response times, overcoming space limitations and beam divergence issues, and requiring minimal maintenance.
Implementation Method 1
direct optical measurement of gas components by adsorption of light at various wavelengths
Data Source
AI summary
A method for measuring component concentration in a sample, the method constituted of: passing light through a sample from a first light source to a first light sensor; measuring a first light intensity of light received at the first light sensor; passing light through the sample from a second light source to a second light sensor at the first light intensity; measuring a second light intensity of light received at the second light sensor; determining an adsorption level based on a difference in intensity from light emitted from the first light source and the second light intensity; and calculating a component concentration in the sample based on the adsorption level and a total optical length of light passed between the first light source and sensor and the second light source and sensor.