Multi-Gas Optical Analyzer Sequential Filter System
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Solution Overview
Problem
Conventional gas analyzer systems require multiple independent systems and complex operating procedures to detect multiple types of gases in flue gas emissions, leading to inefficiencies in cost, reliability, and maintenance, and struggle with interference in shared optical frequency bands.
Innovation Solution
A multi-component analyzer system that uses a single analytical bench with an optical source, detector, and analyzer to measure absorption of optical energy across multiple frequency bands, accounting for interference by sequentially measuring absorbance in different frequency bands to identify and quantify various gases present in the sample.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple independent conventional gas analyzer systems are used to detect multiple gas types, then measurement capability for different gases is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple gas detection capabilities into a single analyzer system by integrating multiple optical sources covering different frequency bands (e.g., UV, visible, infrared) and multiple detectors into one instrument. This allows simultaneous or sequential measurement of multiple gas types (CO, CO2, NO, NO2, SO2, O2, etc.) using a unified optical path and control system, thereby reducing the need for multiple separate analyzer systems while maintaining comprehensive measurement capability
Solution Approach 2:
The analyzer system is designed with universal functionality to detect multiple gas types through a single instrument. The system incorporates multiple optical sources that can be selectively activated based on the target gas, and multiple detectors that can measure different frequency bands. This multi-functional design allows one system to replace multiple specialized analyzers, reducing overall system complexity and cost
2Measurement precision
If multiple independent gas analyzer systems are deployed, then detection accuracy for specific gases is improved, but loss of time and operational efficiency worsen
Solution Approach 1:
The system enables continuous monitoring of multiple gas types simultaneously through parallel optical paths or rapid sequential measurement. Multiple optical sources and detectors operate concurrently to measure different gases in the same sample stream, eliminating the need to switch between separate analyzer systems and maintaining continuous detection accuracy for all monitored parameters
Solution Approach 2:
The system performs preliminary separation and routing of optical signals for different frequency bands before detection. By pre-configuring the optical path with beam splitters, filters, and dichroic mirrors, the system prepares multiple measurement channels in advance, allowing simultaneous detection of multiple gases without sequential processing delays
3Difficulty of detecting and measuring
If conventional analyzer systems with filter wheels and choppers are used, then frequency band selection is improved, but device complexity and reliability worsen
Solution Approach 1:
The patent replaces mechanical filter wheels and chopper wheels with stationary optical elements including dichroic mirrors, beam splitters, and fixed optical filters. These stationary components direct different frequency bands to appropriate detectors without requiring moving parts, thereby simplifying the mechanical structure, reducing maintenance requirements, and improving system reliability while maintaining the ability to select and measure specific frequency bands
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 detection and quantification of multiple gas types in a single system, reducing the need for multiple analyzers and improving reliability and cost-effectiveness by mitigating interference through sequential measurement and analysis of optical absorption across multiple frequency bands.
Implementation Method 1
Each of the different types of gases emitted by a smokestack has unique light absorption characteristics. For example, each gas type can absorb different optical frequencies.
Implementation Method 2
One way to identify a type of gas present in an unknown gas sample is the application of Beer's law. In general, Beer's law defines a relationship that relates the absorption of light to properties of the material through which the light is traveling.
Data Source
AI summary
A gas analyzer system includes an optical source, an optical filter assembly, a controller, and an analyzer. The optical source generates an optical signal. The optical filter assembly includes different optical filters in which to filter the optical signal. During operation, the controller selects sequential application of each of the different optical filters in a path of the optical signal to modulate the optical signal using different frequency bands of optical energy. The modulated optical signal passes through an unknown sample. Based on absorption of the optical signal by the sample gas at different frequencies, the optical analyzer detects which types of multiple different gases are present in the sample.