Optical Gas Sensor Head With Ellipsoidal Cavity
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Solution Overview
Problem
Current gas sensors face challenges in achieving high sensitivity and selectivity for detecting various gas species, including greenhouse gases and toxic substances, especially in harsh environments, and require improvements in durability and accuracy for field applications.
Innovation Solution
The design of an optical gas sensor with a sensor head featuring a light source cavity, optical device cavity, and ellipsoidal cavity, which includes a receiving device cavity, allowing for precise measurement of gas impurities using a quartz-enhanced photo-acoustic spectroscopic (QEPAS) method, where light is directed through a quartz tuning fork to stimulate gas molecules, causing a change in resonant frequency proportional to gas concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional gas sensor designs are used, then device simplicity is maintained, but measurement precision and sensitivity are insufficient for detecting trace gas impurities
Solution Approach 1:
The sensor head is divided into multiple functional cavities (light source cavity, optical device cavity, ellipsoidal cavity, receiving device cavity) that are spatially segmented within a single integrated body. This segmentation allows each component to be optimally positioned and function independently, achieving high measurement precision while maintaining manufacturing simplicity through single-piece construction.
Solution Approach 2:
The patent transitions from linear or planar optical paths to a three-dimensional ellipsoidal cavity configuration. The ellipsoidal geometry creates multiple light reflection paths between the two focal points, increasing the effective optical path length and interaction volume with gas molecules, thereby enhancing detection sensitivity without proportionally increasing device volume.
2Measurement precision
If standard optical paths are used, then device simplicity is maintained, but light-gas interaction efficiency is insufficient for high sensitivity detection
Solution Approach 1:
The optical cavity is designed with an ellipsoidal geometry instead of conventional linear or rectangular paths. This curved geometry ensures that light rays originating from one focal point reflect off the ellipsoidal surface and converge at the second focal point, creating multiple interaction opportunities with gas molecules and significantly enhancing light-gas interaction efficiency for trace impurity detection.
3Reliability
If simple cavity configurations are used, then manufacturing ease is maintained, but sensitivity to corrosive environments and long-term durability are insufficient
Solution Approach 1:
The sensor head body is designed as a single integrated piece containing all optical cavities and channels, eliminating the need for multiple separate components that would require assembly. This segmentation approach simplifies manufacturing through single-piece fabrication while ensuring hermetic sealing against corrosive environments, thereby improving reliability without compromising ease of manufacture.
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
This configuration enhances the sensitivity and accuracy of gas detection, enabling precise measurement of impurities and compliance with stringent standards, while being resistant to corrosive environments and maintaining long-term functionality.
Implementation Method 1
optical gas sensor with a sensor head featuring a light source cavity, optical device cavity, and ellipsoidal cavity, which includes a receiving device cavity, allowing for precise measurement of gas impurities using a quartz-enhanced photo-acoustic spectroscopic (QEPAS) method
Implementation Method 2
quartz-enhanced photo-acoustic spectroscopic (QEPAS) method, where light is directed through a quartz tuning fork to stimulate gas molecules, causing a change in resonant frequency proportional to gas concentration
Implementation Method 3
light is directed through a quartz tuning fork to stimulate gas molecules, causing a change in resonant frequency proportional to gas concentration
Data Source
AI summary
A sensor head is described herein. The sensor head can include a first piece, where the first piece can include a body having an outer surface and an inner surface. The first piece can also include a light source cavity disposed in the body at the inner surface. The first piece can further include an optical device cavity disposed in the body at the inner surface. The first piece can also include an ellipsoidal cavity disposed in the body at the inner surface, where the ellipsoidal cavity is disposed adjacent to the optical device cavity. The first piece can further include a receiving device cavity disposed in the body adjacent to the inner surface that forms the ellipsoidal cavity. The first piece can also include at least one channel disposed in the body.