Optical Fiber Hydrogen Sensing With Thermal Compensation
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Solution Overview
Problem
Hydrogen presence in oil and gas recovery, fluid sequestration, and hydrogen storage systems can degrade metal components and reduce the effectiveness of optical communication in optical fibers, necessitating a method to detect hydrogen presence, quantity, and history to implement preventative measures.
Innovation Solution
A system and method using an optical fiber with a light source, sensor, and processor to measure temperature and signal loss profiles, determining hydrogen partial pressure by comparing calibrated and measured signal characteristics, and using proportionality constants to calculate hydrogen pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical fiber is used for sensing and communication in hydrogen environments, then optical signal transmission is enabled, but the optical signal strength is reduced due to hydrogen-induced darkening
Solution Approach 1:
The patent uses an intermediary substance (hydrogen-absorbing material coating the optical fiber) that mediates between the hydrogen environment and the optical fiber. This coating absorbs hydrogen and transfers it to the fiber, enabling detection while maintaining signal transmission capability through compensation mechanisms.
Solution Approach 2:
The patent changes the operational parameters by measuring signal characteristics at multiple wavelengths and using temperature compensation. By monitoring how signal loss varies with wavelength and temperature, the system can distinguish between hydrogen-induced attenuation and temperature-induced attenuation, maintaining accurate sensing despite signal strength reduction.
2Measurement precision
If temperature compensation is implemented to improve hydrogen detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The optical fiber system performs multiple functions simultaneously: it serves as both the sensing element and the communication medium, and the same fiber can measure both temperature and hydrogen concentration. This multi-functionality reduces the need for separate dedicated sensors, thereby limiting the increase in device complexity despite the need for temperature compensation.
Solution Approach 2:
The system implements feedback by continuously monitoring the optical signal characteristics and using this information to compensate for temperature effects. The measured signal strength and spectral characteristics provide feedback that allows the system to adjust and maintain accurate hydrogen detection despite temperature variations, achieving high measurement precision through software-based compensation rather than additional hardware.
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
Accurately detects hydrogen partial pressure and presence, enabling proactive measures against hydrogen-induced degradation in systems like boreholes, pipelines, and hydrogen storage facilities.
Implementation Method 1
A calibration signal characteristic is obtained along an optical fiber in an absence of hydrogen
Implementation Method 2
Optical fibers that are used in these systems for optical communication of sensing can darken in the presence of hydrogen
Data Source
AI summary
A system and method for determining a partial pressure of hydrogen in a volume. A response is measured of a section of an optical fiber disposed in the volume to a parameter of the volume. A partial pressure of hydrogen in the volume is determined from the response of the optical fiber to the parameter. The presence of hydrogen in the volume is determined from the partial pressure of hydrogen.