Spherical Surface Acoustic Wave Gas Analyzer
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Solution Overview
Problem
Current gas chromatographs are large and cumbersome, limiting their miniaturization and sensitivity, especially when detecting multiple gases simultaneously, and struggle to accurately measure poorly soluble gases like nitrogen and methane, which requires complex and large apparatus.
Innovation Solution
A portable gas analyzer utilizing a spherical surface acoustic wave device with a separation column and reaction parts that generate nondiffracting surface acoustic waves, allowing multiple roundtrips and amplifying physical quantity changes, enabling high-accuracy detection of various gases by measuring velocity and attenuation independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a gas chromatograph is miniaturized, then the device size is reduced, but the sensitivity and measurement accuracy deteriorate
Solution Approach 1:
The patent employs a spherical surface acoustic wave device where surface acoustic waves propagate along the curved surface of a sphere. This spherical geometry enables the waves to travel extended distances (multiple roundtrips) without diffraction loss, as the curvature naturally guides the wave propagation. The spherical shape allows the detector to maintain high sensitivity despite miniaturization, resolving the contradiction between reduced device size and maintained measurement precision.
Solution Approach 2:
The surface acoustic waves in the spherical device can propagate continuously for multiple roundtrips along the spherical surface. This continuous propagation allows the measurement process to accumulate signal information over time, enhancing sensitivity. The waves continuously interact with the gas sample molecules adsorbed on the spherical surface, maintaining the useful detection action throughout multiple cycles, thereby achieving high sensitivity in a compact device.
2Adaptability or versatility
If multiple gases are detected simultaneously, then the detection capability is improved, but the measurement accuracy of individual gases deteriorates
Solution Approach 1:
The patent uses a separation column to segment and separate multiple gas components before they reach the spherical surface acoustic wave detector. The separation column divides the gas mixture into individual components that pass through at different times. This segmentation allows the detector to measure each gas component independently with high accuracy, even when multiple gases are present in the sample, thus maintaining measurement precision while achieving versatile multi-gas detection capability.
Solution Approach 2:
The separation column performs preliminary separation of gas components before they enter the detection chamber. By pre-separating the gases based on their different retention times in the column, the system ensures that individual gas components reach the spherical detector in sequence rather than simultaneously. This preliminary action enables accurate individual measurement of each gas component while maintaining the ability to detect multiple gases.
3Measurement precision
If the propagation distance of surface acoustic waves is increased, then the sensitivity is improved, but the device complexity increases
Solution Approach 1:
The spherical geometry of the surface acoustic wave device naturally guides wave propagation along its surface, enabling extended propagation distances without requiring complex external waveguides or reflection structures. The curvature of the sphere itself provides the necessary path for long-distance wave travel, achieving high sensitivity through multiple roundtrips while maintaining relatively simple device architecture. This eliminates the need for complex additional components that would otherwise be required to achieve long propagation paths.
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 solution allows for the miniaturization of the gas analyzer to a palm-sized device capable of detecting a wide variety of gases with high sensitivity, accurately separating and measuring components based on their pass times and physical property changes, even when multiple gases are present.
Implementation Method 1
a surface acoustic wave generating means capable of generating a surface acoustic wave that propagates along the annular surface
Implementation Method 2
Analyzing the cause, they discovered nondiffracting beams. This is a phenomenon in which surface acoustic waves on a ball are influenced by two effects, i.e., diffraction, as a universal phenomenon of waves, and focusing by the geometric feature of a ball
Implementation Method 3
A gas chromatograph makes use of a phenomenon that when a plurality of gases pass through the inside of a column, e.g., a packed column filled with liquid-coated particles and a capillary column to the inside of which a liquid is applied, the difference in solubility between the gases and the liquid makes a difference in the pass times of the gases
Implementation Method 4
mass loading and elastic loading on a sensitive film 52 due to the influence of gas molecules are measured as changes in frequency (or velocity) of surface acoustic wave
Implementation Method 5
mass loading and elastic loading on a sensitive film 52 due to the influence of gas molecules are measured as changes in frequency (or velocity) of surface acoustic wave
Implementation Method 6
surface acoustic waves on a ball are influenced by two effects, i.e., diffraction, as a universal phenomenon of waves, and focusing by the geometric feature of a ball, and as a result of the balance of them, a narrowly collimated (parallel) beam is naturally formed
Implementation Method 7
surface acoustic waves on a ball are influenced by two effects, i.e., diffraction, as a universal phenomenon of waves, and focusing by the geometric feature of a ball, and as a result of the balance of them, a narrowly collimated (parallel) beam is naturally formed
Data Source
AI summary
A gas analyzer that can be miniaturized and detect a wide variety of gases with high sensitivity, and a method of gas analysis. A separation column is configured so as to pass a sample gas together with a carrier gas through the inside thereof. A surface acoustic wave device has a base material with an annularly continuous annular surface formed of at least a part of a spherical surface; a surface acoustic wave generating means capable of generating a surface acoustic wave that propagates along the annular surface; and a plurality of reaction parts provided along the annular surface so as to change a predetermined physical quantity of the surface acoustic wave in response to the components of the sample gas. The surface acoustic wave device is arranged so that the sample gas passing through the separation column is reacted with the reaction parts. The measuring part can measure a physical quantity of the surface acoustic wave propagating along the annular surface, and the components of the sample gas can be analyzed on the basis of the measured physical quantity.