Gas Sensor Temperature Control for Multi-Gas Identification
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Solution Overview
Problem
Existing gas sensors struggle to accurately determine the type and concentration of gases present in a mixture, as they are unable to differentiate between various gases based on environmental changes such as temperature.
Innovation Solution
An electronic device equipped with a gas sensor that has different sensitivities for each type of gas, and a processor that calculates gas concentrations by analyzing output values from different temperature sections, while controlling a heater to adjust the sensor's temperature based on stored temperature control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gas sensor is used to measure gas concentration, then the device complexity is reduced, but the measurement precision deteriorates because it cannot differentiate between various gases in a mixture
Solution Approach 1:
The patent applies dynamics by varying the temperature of the gas sensor over time to create different sensitivity profiles for different gas types. The temperature is dynamically adjusted between a first temperature (higher sensitivity to first gas type) and a second temperature (higher sensitivity to second gas type), enabling the single sensor to differentiate between multiple gas compositions through temporal temperature variation.
Solution Approach 2:
The patent changes the temperature parameter of the gas sensor to alter its sensitivity characteristics. By controlling the sensor temperature to vary between specific values, the system modifies the sensor's response to different gases, allowing identification of gas types and concentrations without requiring multiple sensors.
2Measurement precision
If the gas sensor temperature is continuously varied to identify different gas types, then the measurement precision improves, but the energy consumption increases
Solution Approach 1:
The patent implements periodic action by cycling the heater temperature between a first temperature and a second temperature in repeated intervals. This periodic temperature variation allows the system to achieve comprehensive gas analysis over time while managing energy consumption through structured heating cycles rather than continuous high-temperature operation.
Solution Approach 2:
The system performs preliminary action by pre-heating the gas sensor to a first temperature to detect the presence and concentration of a first gas type before switching to a second temperature for detecting a second gas type. This sequential approach ensures that each gas detection is performed under optimal temperature conditions, improving overall detection 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 device effectively identifies the type and concentration of multiple gases by utilizing temperature-dependent sensitivity and advanced data processing, enhancing accuracy and reducing power consumption.
Implementation Method 1
a heater configured to vary temperature of a gas sensor
Implementation Method 2
resistance changes as a material subject to measurement adsorbed on a surface of the gas sensor is oxidized or reduced
Implementation Method 3
resistance changes as a material subject to measurement adsorbed on a surface of the gas sensor is oxidized or reduced
Data Source
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Figure 2
AI summary
An electronic device is disclosed. The electronic device comprises: a gas sensor having different sensitivities in temperature for each of a plurality of gases; and a processor for calculating a concentration of at least one of a plurality of gases on the basis of an output value of the gas sensor for different temperature sections.