Retractable Filter Enclosure for Gas Sensor Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electronic nose devices face gas sensor degradation due to aging and atmospheric changes, leading to decreased performance and reliability, with existing solutions like vacuum storage and filters being ineffective or impractical.
Innovation Solution
A protective enclosure for gas sensors that includes an inlet, outlet, and filters, where the gas is unfiltered during measurement to prevent contamination, and filtered during idle periods to remove deleterious compounds, using valves to control gas flow and prevent external contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filters are used to remove deleterious gases during sensing measurements, then sensor degradation is reduced, but analytes of interest are also filtered out leading to loss of detection capability
Solution Approach 1:
The filter is made movable between two positions: retracted during measurement mode to allow unfiltered gas access to the sensor, and extended during storage mode to filter deleterious compounds. This dynamic positioning resolves the contradiction by allowing the system to have both filtered and unfiltered access to the sensor depending on operational state.
Solution Approach 2:
The system alternates between measurement mode (no filtering) and storage/conditioning mode (filtering active) in periodic cycles. During measurement, the filter is retracted; during idle periods, the filter is positioned to remove deleterious compounds from the gas atmosphere surrounding the sensor.
2Duration of action of stationary object
If sensors are stored under vacuum to prevent degradation, then sensor lifespan is extended, but bulky expensive equipment is required
Solution Approach 1:
The patent extracts the harmful vacuum requirement by replacing it with a chemical filtering approach. Instead of using vacuum equipment to remove all gases, a filter selectively removes only deleterious compounds while allowing benign gases to remain, eliminating the need for bulky vacuum equipment.
Solution Approach 2:
The system changes the approach from physical parameter control (vacuum pressure) to chemical parameter control (gas composition filtering). By using filters to alter the chemical composition of the gas atmosphere rather than changing physical pressure conditions, the system achieves sensor protection without vacuum equipment.
3Reliability
If continuous filtering is applied to protect sensors, then sensor degradation is prevented, but measurement accuracy decreases due to filter interference
Solution Approach 1:
The system uses periodic switching between measurement mode (filter retracted, no interference) and protection mode (filter extended, degradation prevented). This periodic action ensures that filtering is applied only when measurement is not occurring, thus maintaining both sensor protection and 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 enclosure effectively prolongs the lifespan of gas sensors by preventing degradation during idle periods, allowing for accurate and reliable gas sensing without the need for bulky equipment, thus enhancing the performance and reliability of electronic nose devices.
Implementation Method 1
the at least one filter removes the at least one deleterious compound from the additional influx of the gas
Implementation Method 2
the at least one filter removes the at least one deleterious compound from the additional influx of the gas
Data Source
AI summary
A small-sized, portable enclosure protects a gas sensor against degradation due to environmental exposure and changes in atmospheric conditions. The protective enclosure includes an inlet for introduction of a gas into the enclosure, an outlet for release of the gas upon completion of a sensing run, and at least one retractable filter that removes from the inflowing gas deleterious compounds that can compromise the integrity of the sensor or cause the sensor to degrade over time. The enclosure does not include any filters during the measurement phase of the sensing run in order to allow the gas sensor to accurately measure an unmodified gas mixture and/or analyte.