Optical Gas Sensor Using Thin Film Refraction
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Solution Overview
Problem
Existing gas sensors are large, complex, and costly, with limited reliability in detecting inert and elemental gases due to factors like mechanical strength, thermal drift, and humidity, and often require special optics and enclosures.
Innovation Solution
A thin film device that refracts and reflects an incident light beam, with a light-sensing probe detecting positional changes to characterize the ambient environment, using computational logic to compare refractive index responses to determine gas presence and concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional gas sensing methods are used, then gas detection capability is achieved, but device size and complexity increase
Solution Approach 1:
The patent replaces traditional mechanical/chemical gas sensing systems with an optical measurement system. A light source emits light through the gas sample, and a detector measures refractive index changes. This optical substitution eliminates complex mechanical components and chemical reaction systems, achieving simpler device structure while maintaining reliable gas detection capability.
Solution Approach 2:
The patent measures gas composition by detecting changes in refractive index parameter. Different gases have distinct refractive index values, allowing identification and quantification of gas components. This parameter-based approach simplifies the sensing mechanism compared to traditional methods while improving detection reliability for inert and elemental gases.
2Reliability
If traditional gas sensors are used, then gas detection is achieved, but cost increases
Solution Approach 1:
The patent replaces expensive traditional gas sensor systems with a cost-effective optical measurement system. The system uses standard light sources and detectors to measure refractive index, eliminating the need for costly specialized sensors, enclosures, and optics required by conventional methods. This substitution maintains detection reliability while significantly reducing manufacturing costs.
3Reliability
If traditional sensing methods are used, then gas detection is achieved, but sensitivity to inert and elemental gases decreases
Solution Approach 1:
The patent measures gas composition by detecting changes in refractive index parameter. Different gases have distinct refractive index values, allowing identification and quantification of gas components. This parameter-based approach simplifies the sensing mechanism compared to traditional methods while improving detection reliability for inert and elemental gases.
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 approach enables reliable and cost-effective monitoring of reactive, elemental, and inert gases by detecting small changes in the refractive index, improving sensitivity and accuracy, particularly for gases like nitrogen, and can be used in controlled environments such as manufacturing and mining.
Implementation Method 1
A thin film is disposed in a path of and responsive to the incident beam to produce a reflected beam
Implementation Method 2
A thin film is disposed in a path of and responsive to the incident beam to produce a reflected beam
Implementation Method 3
A light-sensing probe is capable of detecting the reflected beam
Data Source
AI summary
An apparatus and associated method using a light source selectively emitting an incident beam. A thin film is disposed in a path of and responsive to the incident beam to produce a reflected beam. A light-sensing probe is capable of detecting the reflected beam. Ambient environment logic responsive to the light-sensing probe compares a position of the reflected beam to an expected position to make a characteristic determination of a selected ambient environment through which the incident beam propagated.