Odor Sensor Cleaning Cycle for Measurement Accuracy
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Solution Overview
Problem
Existing odor sensors face challenges in accurately measuring odors due to non-uniform gas mixing, temperature, and humidity variations, leading to decreased measurement accuracy as previous odor particles are not properly desorbed from the sensor surface, affecting the adsorption of new gas particles.
Innovation Solution
A device and method that supply cleaning air to eliminate previous odor particles and heat or cool the odor sensor to facilitate desorption and adsorption, improving measurement accuracy by ensuring the surface is clear and optimized for new gas interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If odor measurement is performed for a predetermined time, then odor data can be obtained, but the odor measurement target gas particles may not be uniformly mixed in the air, causing measurement accuracy to deteriorate
Solution Approach 1:
The patent implements periodic action by alternating between measurement mode and cleaning mode in a cyclic manner. The odor sensor performs measurement for a predetermined time, then switches to cleaning mode to desorb accumulated gas particles, and returns to measurement mode. This periodic switching ensures uniform mixing of gas particles with the sensor surface while maintaining measurement accuracy over extended periods.
Solution Approach 2:
The patent changes the operational parameters of the odor sensor by switching between measurement and cleaning states. During cleaning mode, the sensor operates at different conditions (such as adjusted temperature or electrical parameters) to facilitate desorption of gas particles, then returns to measurement parameters. This parameter change enables the sensor to maintain high measurement accuracy despite continuous operation.
2Measurement precision
If odor measurement target gas particles are adsorbed to the surface of the odor sensor, then odor measurement can be performed, but the previously adsorbed gas particles cannot be properly desorbed, causing measurement accuracy to deteriorate
Solution Approach 1:
The patent uses periodic action by implementing a cycle of measurement followed by cleaning. After gas particles are adsorbed during measurement, the system switches to cleaning mode where the odor sensor surface is heated or treated to desorb residual particles. This periodic measurement-cleaning cycle prevents accumulation of harmful residual gas particles while maintaining continuous measurement capability.
Solution Approach 2:
The patent utilizes phase transitions or state changes to facilitate desorption of gas particles from the sensor surface. During cleaning mode, the odor sensor undergoes a state change (such as temperature increase) that transforms the adsorbed gas particles from a bound state to a free state, enabling their removal. This phase transition approach effectively eliminates residual gas particle interference.
3Productivity
If the odor sensor operates continuously, then odor data can be collected, but temperature and humidity variations cause measurement accuracy to vary
Solution Approach 1:
The patent implements periodic action by switching between measurement mode and cleaning mode. During measurement mode, the sensor continuously collects odor data. During cleaning mode, the sensor performs desorption and stabilization to compensate for temperature and humidity variations. This periodic switching maintains high productivity while ensuring measurement accuracy by periodically resetting the sensor state.
Solution Approach 2:
The patent employs feedback mechanisms where the system monitors temperature and humidity conditions and adjusts operation accordingly. The controller receives feedback about environmental conditions and modulates the measurement and cleaning cycles to compensate for variations, ensuring consistent measurement accuracy while maintaining continuous data collection.
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 effectively enhances measurement accuracy by ensuring previous odor particles are desorbed and new particles are easily adsorbed, improving the reliability of odor detection and analysis.
Implementation Method 1
supply cleaning air into the odor sensor chamber to eliminate previous odor measurement target gas particles... heat the odor sensor to easily desorb previous odor measurement target gas particles from the surface of the odor sensor
Implementation Method 2
odor measurement target gas particles are adsorbed to a surface of the odor sensor... the odor measurement may be performed while outputting an electrical signal when the odor measurement target gas particles are adsorbed to the surface of the electrochemical odor sensor
Data Source
AI summary
An embodiment device for measuring an odor includes an odor sensor chamber including a cleaning air supply port and a gas inlet port provided at a first side portion and a gas discharge port provided at a second side portion, an odor sensor mounted in the odor sensor chamber, a first valve mounted in the cleaning air supply port, a second valve mounted in the gas inlet port, a third valve mounted in the gas discharge port, a heater mounted in the odor sensor chamber, a cooler mounted in the odor sensor chamber, and a controller configured to perform control to open or close the first valve, the second valve, and the third valve and to turn on or off the heater and the cooler.