MOS Hydrogen Sulfide Detector Humidity Compensation
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Solution Overview
Problem
Metal oxide semiconductor-type hydrogen sulfide gas sensors are susceptible to errors caused by changes in environmental humidity and temperature, leading to inaccurate measurements at ppm levels.
Innovation Solution
Incorporating a relative humidity and temperature measurement system to compensate the hydrogen sulfide gas sensor output using an equation that accounts for environmental conditions, ensuring improved accuracy in hydrogen sulfide gas concentration measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If metal oxide semiconductor sensors are used for hydrogen sulfide detection, then the sensor can operate in wide ranging temperatures and dry conditions with long life, but the sensor becomes susceptible to errors caused by changes in environmental humidity and temperature
Solution Approach 1:
The patent incorporates humidity and temperature sensors that continuously monitor environmental conditions and feed this data back to a processor. The processor uses this feedback to dynamically adjust and compensate the hydrogen sulfide sensor readings, eliminating measurement errors caused by environmental variations while preserving the sensor's long operational life
Solution Approach 2:
The patent changes the operational parameters by introducing separate humidity and temperature sensing capabilities. By measuring these environmental parameters independently and using them to compensate the main sensor output, the system maintains measurement accuracy across varying environmental conditions while retaining the robustness and longevity of metal oxide semiconductor sensors
2Measurement precision
If sensor response times and stability are improved to detect low concentrations, then acceptable exposure levels can be decreased, but environmental condition variations become dominant in determining sensor precision
Solution Approach 1:
The patent introduces humidity and temperature sensors as intermediary devices that mediate between the environmental conditions and the hydrogen sulfide sensor. These intermediaries measure the environmental factors and enable compensation calculations, effectively isolating the main sensor from environmental interference and maintaining high detection precision
Solution Approach 2:
By implementing a feedback loop where environmental sensor data continuously adjusts the hydrogen sulfide sensor readings, the system maintains high detection precision even at low concentration levels. The feedback mechanism counteracts environmental interference in real-time, allowing for decreased acceptable exposure levels with confidence in measurement accuracy
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 solution provides enhanced accuracy in hydrogen sulfide gas detection by effectively compensating for humidity and temperature variations, leading to improved precision and reliability in industrial settings.
Implementation Method 1
When hydrogen sulfide gas comes into contact with the gas sensitive material, there is a measurable change in the electrical conductivity
Implementation Method 2
a hydrogen sulfide sensor is constructed as a sandwich of a platinum heater element
Data Source
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AI summary
A hydrogen sulfide gas detector (10) is provided. The detector (10) includes a metal oxide semiconductor-based hydrogen sulfide gas sensor (30) having an electrical characteristic that varies with hydrogen sulfide gas concentration. Measurement circuitry (28) is coupled to the metal oxide semiconductor-based hydrogen sulfide gas sensor (30) to measure the electrical characteristic. A controller (22) is coupled to the measurement circuitry (28) and is configured to receive an indication of the electrical characteristic of the hydrogen sulfide gas sensor (30) as well as an indication of ambient humidity. The controller (22) is configured to provide a compensated hydrogen sulfide gas concentration output based on the indication of the electrical characteristic of the hydrogen sulfide gas sensor (30), an indication of ambient temperature, and the indication of ambient humidity.