Optical Hydrogen Sensor Using Polarized Light Detection
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Solution Overview
Problem
Existing hydrogen gas sensors require high temperatures and complex magnetic field configurations, leading to increased costs and safety concerns due to the risk of explosions from electrical components, and they often necessitate the use of magnetic materials which can complicate the sensor design.
Innovation Solution
An optical chemical sensor system that uses a sensing element with a layered structure comprising a chemical sensing layer, an optical interference layer, and a reflection layer, illuminated obliquely to detect changes in p-polarized and s-polarized light, allowing for hydrogen gas detection without the need for high temperatures or magnetic materials, thereby reducing costs and safety risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high temperature operation is used for hydrogen gas sensors, then response speed and cleaning effect are improved, but safety risk increases due to possibility of explosion from electrical components
Solution Approach 1:
The patent replaces electrical heating and detection mechanisms with an optical system. A light source illuminates the sensing element at a specific angle, and optical detectors measure the reflected light intensity. This substitution eliminates electrical components in the hydrogen atmosphere, removing the explosion hazard while maintaining fast response through optical detection methods.
2Measurement precision
If magnetic materials and magnetic field application mechanism are used for hydrogen gas detection, then detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and removes the magnetic field application mechanism and magnetic materials from the sensor system. Instead of using magneto-optical effects requiring complex layered films and magnetic field generators, the invention employs a straightforward optical reflection method where light intensity changes directly indicate hydrogen concentration, dramatically simplifying the device structure.
Solution Approach 2:
The sensing element serves as an optical intermediary that converts hydrogen gas concentration changes into light intensity variations. The sensing film's optical properties change in response to hydrogen adsorption, modulating the reflected light intensity without requiring magnetic materials or complex field application mechanisms.
3Object-affected harmful factors
If optical hydrogen gas sensor is used, then safety is improved by eliminating high temperature and electrical components, but manufacturing cost increases due to complex film configuration
Solution Approach 1:
The patent employs a simplified sensing element structure that can be manufactured more economically. Rather than requiring complex multi-layer magnetic and optical films, the sensing element uses a straightforward sensing film on a substrate, reducing manufacturing complexity and cost while maintaining safety through the all-optical detection approach.
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 system enables sensitive and stable detection of hydrogen gas concentrations using the ratio of reflected p-polarized to s-polarized light intensities, eliminating the need for high-temperature operation and magnetic materials, thus enhancing safety and reducing costs while maintaining high sensitivity and resolution.
Implementation Method 1
a chemical sensing layer configured to change in an optical characteristic in response to contact with a target substance
Implementation Method 2
a reflection layer configured to reflect at least part of incident light
Implementation Method 3
an intermediate layer located between the reflection layer and the chemical sensing layer
Implementation Method 4
The detector device is configured to separately detect p-polarized light and s-polarized light reflected off the sensing element
Data Source
AI summary
A sensor system includes a sensing element, an illumination optical system including a light source, the illumination optical system being configured to obliquely illuminate the sensing element, and a detector device configured to detect light reflected off the sensing element. The sensing element includes a chemical sensing layer configured to change in an optical characteristic in response to contact with a target substance, a reflection layer configured to reflect at least part of incident light, and an intermediate layer located between the reflection layer and the chemical sensing layer. The detector device is configured to separately detect p-polarized light and s-polarized light reflected off the sensing element.