Resistance Gas Sensor Modulation for Selectivity
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Solution Overview
Problem
Resistance gas sensors have limited selectivity, which is influenced by operating temperature and UV radiation, making them less effective for detecting multiple gases, especially in low concentrations, and require multiple sensors or lengthy thermal stabilization.
Innovation Solution
A method using combined changes in operating temperature and UV radiation wavelengths to modulate the properties of a single resistance gas sensor, allowing for increased sensitivity and selectivity by independently controlling temperature and UV exposure to enhance gas detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single resistance gas sensor is used, then device complexity and energy consumption are reduced, but selectivity and sensitivity for detecting multiple gases deteriorate
Solution Approach 1:
The patent applies dynamics by making the sensor properties adjustable through real-time modulation of operating temperature and UV radiation exposure. The sensor transitions between different operational states to detect various gases, replacing the need for multiple fixed-function sensors. This is achieved by dynamically changing the sensor's response characteristics through controlled thermal and photonic stimulation.
Solution Approach 2:
The patent utilizes parameter changes by systematically varying operating temperature and UV radiation intensity to modulate the sensor's sensitivity and selectivity. Different gas components are detected by adjusting these parameters to specific ranges, allowing a single sensor to perform the function of multiple sensors with fixed characteristics. The sensor's electrical resistance response is measured under different parameter combinations to identify various gases.
2Measurement precision
If operating temperature is increased to improve sensitivity, then gas detection sensitivity improves, but thermal stabilization time increases
Solution Approach 1:
The patent applies preliminary action by pre-heating the sensor to the required operating temperature before gas measurement begins. This ensures the sensor is already thermally stabilized when detection is needed, eliminating delays during actual operation. The system performs thermal conditioning in advance so that when gas samples are introduced, the sensor is ready to provide immediate, accurate readings without requiring stabilization time during measurement.
3Adaptability or versatility
If metal doping is applied to improve selectivity, then sensor selectivity improves, but manufacturing complexity increases
Solution Approach 1:
The patent replaces the mechanical/chemical approach of metal doping with a field-based approach using UV radiation and thermal modulation. Instead of physically modifying the sensor material during manufacturing to achieve selectivity, the system uses external energy fields (UV light and heat) to dynamically control sensor response. This substitution eliminates complex doping processes while achieving comparable or superior selectivity through non-invasive parameter control.
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
This approach enables high sensitivity and selectivity in detecting multiple gases using a single sensor, reducing energy consumption and system complexity while maintaining efficient gas detection, similar to arrays of sensors.
Implementation Method 1
The photocatalytic effect present in the gas-sensing layer is monitored in the gas sensor... UV radiation supplies additional energy, which in one of the observed mechanisms causes the formation of oxygen photoions
Implementation Method 2
The operating temperature of the sensor influences the rate of adsorption and desorption... at least two temperature changes are required, e.g. from room temperature to a higher temperature
Data Source
Figure 1~2
AI summary
The invention refers to the method of measurement of gas by recording the direct current resistance from a resistance gas sensor and a system for implementing this method. It uses a gas sensor (RS) in the form of two metal electrodes and a gas-sensing layer between them, while the operation of the gas sensor (RS) is modulated by a combination of at least two changes of temperature of the gas-sensing layer of the resistance gas sensor (RS) using the heating device (RH) supplied by the first modulated source of voltage (Ul) and simultaneous exposure of the gas-sensing layer to UV radiation, which is emitted by at least one source of UV radiation (DUV) supplied by the second modulated source of voltage (U2). At least two changes in temperature and at least one UV radiation wavelength are used, while measuring the resistance between the two electrodes with a known method.