Differential Hydrogen Gas Sensor for Temperature Error Compensation
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Solution Overview
Problem
The challenge in the field of electromobility is the safe and reliable detection of hydrogen leaks outside hydrogen stores and fuel cell systems in vehicles, given the exothermic nature of hydrogen with low ignition energy, necessitating precise gas sensing technologies.
Innovation Solution
A differential gas sensor comprising two sensor components, one selectively detecting a target gas and the other measuring total gas pressure, with a circuit to determine the difference between their output signals, ensuring accurate hydrogen detection by compensating for temperature influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor component is used to detect hydrogen, then the device complexity is reduced, but temperature errors affect measurement precision
Solution Approach 1:
The sensor is divided into two separate sensor components: a first sensor component that is selective to hydrogen and a second sensor component that is not selective to hydrogen. This segmentation allows each component to perform a specific function, with the first component detecting hydrogen and the second component measuring total pressure, thereby eliminating temperature errors through differential measurement.
Solution Approach 2:
The second sensor component acts as an intermediary that measures the total pressure and environmental conditions, allowing the circuit to compensate for temperature effects and other interference factors. This intermediary measurement enables accurate hydrogen detection by providing reference data for error correction.
2Measurement precision
If a differential design with two sensor components is used, then measurement precision is improved by eliminating temperature errors, but device complexity increases
Solution Approach 1:
The two sensor components are integrated into a single sensor housing with a common membrane structure, allowing them to share mechanical support and environmental exposure. This merging reduces the overall complexity compared to using two completely separate sensors, while still maintaining the differential measurement capability for improved precision.
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 differential design effectively eliminates temperature errors and provides precise hydrogen detection, enabling safe monitoring of hydrogen levels in environments where it is stored or transported.
Implementation Method 1
the first sensor component (10) has a first cavity (11) and a first layer (13) arranged between the first cavity (11) and the environment, wherein the first layer (13) is selectively permeable to hydrogen
Implementation Method 2
the first sensor element (410) is pressure-sensitive and arranged in the first cavity (411), wherein a partial pressure of the surrounding hydrogen changes the film stress of the functional layer (412) and this results in bending of the pressure-sensitive membrane (410)
Implementation Method 3
a circuit (101) determining a difference between the first output signal and the second output signal
Data Source
AI summary
A differential gas sensor includes a first sensor component to selectively detect a first gas present in the environment and to supply a first output signal, a second sensor component configured to supply a second output signal, and a circuit configured to determine a difference between the first output signal and the second output signal.