Variable Pulse Voltage Waveform Gas Sensor
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Solution Overview
Problem
Current gas detecting techniques using metal oxide semiconductor technology face challenges such as signal drift due to environmental factors and difficulties in accurately detecting gas mixtures, leading to inaccurate concentration determination and high costs, with existing solutions either lacking precision or increasing detection time and cost.
Innovation Solution
A gas detecting system that employs a database to store characteristic signals, a voltage unit to output a variable pulse voltage waveform, a detecting unit to react with gas molecules, and a processing unit to perform dimensionless calculations, producing a relative signal unaffected by environmental factors, allowing for accurate analysis and detection of target gases and their concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If metal oxide semiconductor sensors are used for gas detection, then low cost and rapid measurement are achieved, but signal drift occurs due to environmental factors such as temperature and humidity
Solution Approach 1:
The patent applies parameter changes by implementing a variable pulse voltage waveform that dynamically adjusts the heating voltage applied to the sensor. The voltage varies over time according to a predetermined waveform pattern, which changes the temperature profile of the metal oxide semiconductor sensor. This dynamic parameter adjustment eliminates the influence of environmental factors like temperature and humidity on the sensing signal, thereby resolving the contradiction between measurement precision and signal stability
Solution Approach 2:
The patent implements periodic action through the use of a variable pulse voltage waveform that applies heating voltage in periodic pulses rather than continuously. The voltage is applied in cycles with specific on/off patterns, creating periodic heating action. This periodic stimulation allows the sensor to operate in a controlled thermal cycle that eliminates environmental interference while maintaining reliable and drift-free detection signals
2Measurement precision
If conventional detection methods are used for gas mixtures in the same group, then detection is possible, but accurate concentration determination and mixing ratio identification are difficult
Solution Approach 1:
The patent uses parameter changes by applying variable pulse voltage waveforms with different characteristics to elicit distinct response patterns from different gas types. By changing the voltage parameters and analyzing the temporal characteristics of the sensor response, the system can differentiate between gases in the same group (e.g., methanol and ethanol) and accurately determine their concentrations and mixing ratios without requiring complex additional equipment
3Measurement precision
If existing gas detecting technology is implemented, then gas detection is achieved, but bulky and costly testing equipment is required, resulting in increased detection time and cost
Solution Approach 1:
The patent applies self-service by making the metal oxide semiconductor sensor perform multiple functions through variable voltage stimulation. The same sensor that detects gas presence also determines concentration and identifies gas types when subjected to the variable pulse voltage waveform. This eliminates the need for separate testing equipment, reducing device complexity while maintaining detection capability and enabling real-time analysis
Solution Approach 2:
The patent implements universality by designing a system where a single sensor platform can detect multiple types of gases, determine their concentrations, and identify mixing ratios through the use of variable pulse voltage waveforms. The system performs multiple detection functions simultaneously with one device, eliminating the need for bulky specialized equipment and reducing both cost and detection time
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 system effectively eliminates the influence of environmental factors, enabling precise detection and analysis of target gases and their concentrations, reducing costs and detection time, and allowing for real-time analysis, making it user-friendly and suitable for daily applications.
Implementation Method 1
a detecting unit for increasing its own temperature based on the variable pulse voltage waveform outputted by the voltage unit to react with gas molecules from a particular space
Implementation Method 2
the metal oxide film in the heating process reacts with the gas molecules in the environment, thereby changing the resistance of the metal oxide film to output a corresponding sensing signal
Data Source
AI summary
A gas detecting system, device and method use a variable pulse voltage waveform to increase the temperature of a detecting unit of the gas detecting system so it reacts with gas molecules from a particular space, and outputs a sensing signal. A processing unit of the gas detecting system then performs calculations on the sensing signal, such that an analysis unit may determine the presence of a target gas in the particular space, and further the composition and concentration of the target gas within the particular space, thus providing a detection that is accurate, rapid and convenient.