Optical Hydrogen Sensor Laminate Magneto-Optical Detection
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Solution Overview
Problem
Conventional hydrogen gas sensors face challenges such as high operating temperatures, risk of ignition due to electrical circuits, and instability in detection signals due to light source fluctuations and dust interference, particularly in detecting hydrogen gas leaks safely and accurately.
Innovation Solution
An optical detection type chemical sensor with a laminate structure on a transparent substrate, comprising a chemical detection layer, an optical interference layer, and a half mirror layer, utilizing a magnetic material to enhance the magneto-optical effect through multiple reflection, allowing for stable detection of hydrogen gas without electrical risks and signal fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrical sensors (contact combustion, semiconductor, gas thermal conduction) are used to detect hydrogen gas, then detection sensitivity and response speed are improved, but the risk of ignition due to electrical circuits increases
Solution Approach 1:
The patent replaces electrical detection mechanisms with an optical detection system. A light source emits light through a laminate structure containing a hydrogen detection layer, and a photodetector measures changes in light transmission or reflection when hydrogen gas is present. This optical system eliminates electrical circuits in the detection path, removing the ignition risk while maintaining high detection sensitivity through optical property changes of the detection layer.
2Object-affected harmful factors
If optical detection methods using light transmission or reflection are used, then the risk of ignition is reduced, but detection signal stability deteriorates due to light source fluctuations and dust interference
Solution Approach 1:
The patent introduces a laminate structure with multiple layers as an intermediary between the light source and the hydrogen detection process. The laminate includes a hydrogen detection layer with specific optical properties, and additional layers that control light transmission and reflection. This intermediary structure converts light source intensity fluctuations into consistent optical path changes, stabilizing the detection signal while maintaining the safety advantages of optical detection.
Solution Approach 2:
The patent utilizes changes in optical parameters (transmission, reflection, absorption) of the hydrogen detection layer when it interacts with hydrogen gas. By measuring these parameter changes rather than direct light intensity, the system achieves stable detection signals that are insensitive to light source fluctuations. The laminate structure is designed to enhance these parameter changes through multiple reflections and transmissions.
3Speed
If high operating temperatures (200°C or greater) are applied to improve response speed and cleaning effect, then response time is reduced, but energy consumption and device complexity increase
Solution Approach 1:
The patent replaces thermal processing with optical detection. Instead of heating the detection layer to accelerate hydrogen interaction and improve response time, the system uses optical methods to detect hydrogen at room temperature. The hydrogen detection layer is designed with optical properties that change in response to hydrogen gas at ambient conditions, eliminating the need for high-temperature operation while maintaining fast response through direct optical measurement.
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 sensor provides high sensitivity and stability in detecting hydrogen gas concentrations, operating at room temperature with reduced noise and complexity, enabling safe and accurate detection of hydrogen gas leaks.
Implementation Method 1
an optical detection type chemical sensor that relies on the magneto-optical effect in a laminate including a chemical detection layer, a half mirror layer, and an optical interference layer
Implementation Method 2
multiple reflection occurring in the laminate intensifies the magneto-optical effect
Data Source
AI summary
An optical detection type chemical sensor includes a light source, a detection element and a photodetector. The detection element is constituted of a laminate in which a multilayer film including a chemical detection layer, an optical interference layer, and a half mirror layer is formed on a transparent substrate. At least one of the layers includes a magnetic material. Light from the light source is applied to the detection element under the condition that the light enters inside of the detection element from the rear surface of the transparent substrate on which the laminate is not formed and multiple reflection occurring in the laminate intensifies the magneto-optical effect. A subject is detected by using the photodetector to detect a magneto-optical signal indicating a change in reflected light from the laminate resulting from a change in an optical property resulting from a reaction in the chemical detection layer.