Optical-Path-Adjustable Gas Detection Device
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Solution Overview
Problem
Current infrared spectroscopy methods for detecting gas mixtures like C4F7N/CO2 in electrical equipment face challenges due to superimposed interference from high concentrations of background gases, making it difficult to determine optimal optical path lengths for accurate detection, and existing devices lack portability and are costly.
Innovation Solution
An optical-path-adjustable device and method using a movable detector module within an optical gas cell, allowing for the collection of spectral data under varying optical paths to determine the optimal path length and improve detection accuracy, combined with a deep learning model for qualitative and quantitative analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a long optical path length is used to improve detection sensitivity of trace components, then the spectral saturation of background gas increases, making it difficult to detect decomposition components
Solution Approach 1:
The patent implements a movable mirror mechanism that allows dynamic adjustment of the optical path length. The mirror can be positioned at different locations (first position for long path, second position for short path) to adaptively optimize detection conditions based on gas concentration levels, resolving the contradiction between sensitivity and spectral saturation.
2Loss of information
If a short optical path length is used to avoid spectral saturation of background gas, then the detection sensitivity for trace decomposition components is limited
Solution Approach 1:
The movable mirror enables dynamic switching between short and long optical paths. When background gas concentration is high, the mirror positions the beam to traverse a shorter path through the gas cell, avoiding saturation while still allowing detection of trace components through the transmitted light.
3Measurement precision
If conventional infrared spectrometer is used to obtain infrared spectra, then the detection system lacks portability and requires complex gas circuit design, increasing device complexity
Solution Approach 1:
The patent extracts the core spectral detection function from a conventional complex spectrometer and implements it using simplified components: a light source, a movable mirror for optical path control, and a detector. This extraction eliminates the need for complex gas circuits and bulky spectrometer hardware while maintaining detection capability.
Solution Approach 2:
The patent replaces the complex mechanical and optical systems of traditional spectrometers with a simpler configuration using a movable mirror and direct detector arrangement. This substitution maintains spectral analysis capability while dramatically reducing device complexity and improving portability.
4Device complexity
If miniaturized infrared spectrum detection is used to achieve portability, then the detection performance seriously declines and cost increases
Solution Approach 1:
The movable mirror mechanism provides dynamic optical path adjustment that compensates for the miniaturized form factor. By allowing the light beam to traverse extended paths within a compact cell volume through multiple reflections, the system maintains high detection sensitivity despite the reduced physical size.
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 portable detection of complex gas mixtures by optimizing optical path lengths and improving sensitivity, reducing spectral saturation, and enhancing the detection of trace components, while supporting the development of more reliable and cost-effective monitoring systems.
Implementation Method 1
Infrared spectroscopy has the advantages of fast response, high sensitivity, and convenient operation. Compared with methods of chemical detection based on semiconductor sensors and the like, infrared spectroscopy has less cross-interference and will not damage gas samples
Implementation Method 2
a laser light source or a broadband light source combined with a narrow-band filter is used as a detection light source
Data Source
AI summary
Disclosed are a device of complex gas mixture detection based on optical-path-adjustable spectrum detection and a method therefor, and the device includes: a light source configured for generating an incident beam and emitting the incident beam into an optical gas cell; the optical gas cell, including a cavity configured for accommodating a gas sample, and a reflection module group configured for reflecting the incident beam and a track arranged in the cavity, where the track is consistent with a light path of the light beam in the cavity; a detector module that is connected with the track in a relatively movable manner and is configured for receiving light beams and obtaining spectral data, where an optical path is changed by moving the detector module relative to the track; and a data acquisition unit that is configured for acquiring the spectral data obtained by the detector module.