Optical Hydrogen Sensor Using Fabry-Perot Interferometer
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Solution Overview
Problem
Conventional electrically operated hydrogen sensors pose a risk of explosion due to the potential for electric sparks, and they lack the sensitivity, accuracy, and selectivity required for detecting colorless, odorless, and tasteless hydrogen gas effectively.
Innovation Solution
An optical sensor system utilizing a fiber Fabry-Perot interferometer with a sensing material that changes volume in response to hydrogen gas, altering the interference wave spectrum, allowing for hydrogen detection without the risk of electric sparks, and providing high sensitivity, accuracy, and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrically operated hydrogen sensor is used, then hydrogen gas can be detected, but an electric spark may occur at or around the sensor which gives a risk of explosion
Solution Approach 1:
The patent replaces the electrical sensing mechanism with an optical interference-based detection system. The fiber Fabry-Perot interferometer uses light waves instead of electrical signals to detect hydrogen gas, eliminating the source of electric sparks while maintaining detection capability through optical path length changes caused by hydrogen interaction with the sensing material.
Solution Approach 2:
The patent changes the detection parameter from electrical signals to optical interference patterns. By monitoring changes in the interference wave spectrum (wavelength, intensity distribution) rather than electrical properties, the system achieves hydrogen detection without generating electric sparks, thus resolving the safety issue while maintaining detection functionality.
2Measurement precision
If conventional electric hydrogen sensors are used, then hydrogen detection is possible, but they lack the sensitivity, accuracy, and selectivity required for detecting colorless, odorless, and tasteless hydrogen gas effectively
Solution Approach 1:
The patent introduces a sensing material layer as an intermediary between the optical detection system and hydrogen gas. This sensing material selectively interacts with hydrogen molecules, converting their presence into measurable optical interference pattern changes. The intermediary material enhances both sensitivity and selectivity by providing a specific chemical or physical interaction mechanism with hydrogen.
Solution Approach 2:
The patent utilizes changes in optical interference patterns (analogous to color changes) to detect hydrogen gas. The interference wave spectrum exhibits characteristic changes in wavelength and intensity distribution when hydrogen interacts with the sensing material, providing a measurable optical signal that enables accurate and selective detection without relying on electrical properties.
3Reliability
If an optical sensor with fiber Fabry-Perot interferometer is used, then hydrogen gas can be detected without electric spark risk, but the device structure becomes more complex
Solution Approach 1:
The patent implements a nested structure where the sensing material is integrated within the interferometer cavity, and the entire optical sensor is coupled to an optical fiber. The fiber Fabry-Perot interferometer itself is nested within a compact housing with the sensing material layer positioned between reflective surfaces. This nesting approach reduces overall device size and simplifies integration while maintaining the complex optical functionality.
Solution Approach 2:
The optical fiber serves multiple functions: it acts as both the light transmission medium and the coupling mechanism to the interferometer, while the sensing material performs both hydrogen detection and optical path modulation. The interferometer structure simultaneously provides optical interference generation and serves as the sensing cavity. This multi-functionality reduces the number of separate components needed.
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 optical sensor system effectively detects hydrogen gas with the same level of sensitivity and speed as conventional electronic sensors, without the risk of explosion, and operates independently of the surrounding environment, with a simple and economical configuration.
Implementation Method 1
a sensing material that expands and contracts by reacting with hydrogen gas
Implementation Method 2
an interference wave formed by repeated reflection and transmission of light between a first reflection surface formed between the cavity and the optical fiber and a second reflection surface formed between the cavity and the support layer
Implementation Method 3
a sensor module configured to form an interference wave according to a Fabry-Perot interferometer with respect to light that moves through the optical fiber
Data Source
AI summary
Embodiments relate to an optical sensor for sensing hydrogen gas, which includes an optical fiber through which light moves; a ferrule formed at one end of the optical fiber to surround the optical fiber; and a sensor module configured to form an interference wave according to a Fabry-Perot interferometer with respect to light that moves through the optical fiber, wherein the sensor module includes a sensing material that expands and contracts by reacting with hydrogen gas, and spectrum periodicity of the interference wave changes according to a volume change of the sensing material, and a hydrogen gas detection system including the optical sensor.