Gas Sensor Encapsulant Removal for Storage Stability
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Solution Overview
Problem
Gas sensors are susceptible to changes in electrical properties due to toxic gases, moisture, and UV rays during long-term storage, which affects their sensitivity and selectivity, and existing solutions like moisture filters have limited lifespan and require frequent replacement.
Innovation Solution
A gas sensor design that includes a heater with a detection material coated by an encapsulant, which can be thermally decomposed before use to protect the sensor from environmental interference, ensuring stability and reliability during storage and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is used to adsorb moisture at the gas inlet port, then humidity stability of the gas sensor is improved, but the filter has limited lifespan and requires frequent replacement
Solution Approach 1:
The encapsulant is applied to the detection material before the sensor is deployed, providing protective action in advance. This preliminary protection prevents poisoning during storage without requiring a separate filter component that would need replacement.
Solution Approach 2:
The harmful effect of moisture and toxic gases is isolated from the detection material by extracting it into a separate encapsulant layer. This allows the detection material to remain protected during storage while enabling gas detection when needed.
2Duration of action of stationary object
If a gas sensor is stored for a long time, then the sensor remains ready for use, but the electrical properties change due to poisoning by toxic gases, moisture or UV rays
Solution Approach 1:
The encapsulant provides preliminary protection against poisoning factors (toxic gases, moisture, UV rays) before the sensor is activated. This preemptive measure prevents degradation during storage, maintaining electrical property stability throughout the storage period.
Solution Approach 2:
The physical state of the encapsulant changes from intact (during storage) to decomposed (during operation). By controlling the thermal decomposition temperature, the system transitions between protected storage mode and active detection mode, maintaining reliability throughout.
3Reliability
If an encapsulant is coated on the detection material to protect from poisoning, then stability during storage is improved, but the encapsulant must be removed before operation
Solution Approach 1:
The heater, which is already an integral component of the gas sensor for heating the detection material, serves a dual function: it removes the encapsulant through thermal decomposition and then heats the detection material for gas sensing. This self-service approach eliminates the need for separate removal mechanisms.
Solution Approach 2:
The encapsulant undergoes thermal decomposition (a chemical phase transition) when heated to a specific temperature range. This phase transition automatically removes the protective layer when the heater is activated, simplifying the operational procedure while maintaining storage stability.
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 encapsulant protects the detection material from poisoning effects during storage, allowing for reliable operation and extending the lifespan of gas sensors by removing the encapsulant when needed, thereby maintaining sensitivity and selectivity.
Implementation Method 1
heating the heater to remove the encapsulant from the detection material when the gas sensor is operated
Implementation Method 2
employs a dedicated heater for a smooth oxidation/reduction reaction of a detection gas and a detection material
Implementation Method 3
determine a concentration of a detection gas by using a degree by which a resistance of a detection material such as a metal oxide, a polymer and a carbon nano tube is changed during an oxidation/reduction reaction
Data Source
AI summary
Disclosed are a gas sensor, and a method of manufacturing and using the same. The method includes: forming a detection material on a heater; coating an encapsulant on the detection material; and heating the heater to remove the encapsulant from the detection material when the gas sensor is operated.