Actuator-Driven Gas Convection in Sensor Containers
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Solution Overview
Problem
Gas sensors in portable communication devices face reduced sensitivity and selectivity due to the buildup of residual gases, which hinders their ability to effectively detect various gas species.
Innovation Solution
A gas-sensing apparatus with a built-in actuator that induces convection within a container housing the gas sensor, using piezo-electric, thermal bi-stable, or shape memory alloy actuators to prevent residual gas buildup by actively circulating gas samples, thereby maintaining sensor sensitivity and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If gas sensors are used in portable communication devices, then environmental monitoring capability is improved, but residual gas buildup reduces sensor sensitivity and selectivity
Solution Approach 1:
The patent introduces a movable substrate that can be actuated to dynamically circulate gas samples over the gas sensor surface. This dynamic movement prevents residual gas accumulation by continuously refreshing the gas environment around the sensor, thereby maintaining sensor performance while enabling portable environmental monitoring applications.
2Reliability
If gas sampling is performed in a closed container, then sensor protection is improved, but gas circulation is restricted leading to residual gas buildup
Solution Approach 1:
The substrate is designed to be movable relative to the gas sensor within the closed container. When actuated, it creates gas circulation patterns that maintain fresh gas contact with the sensor surface while preserving the protective enclosed environment. This resolves the contradiction by enabling both protection and circulation within the same closed system.
Solution Approach 2:
The substrate can be actuated periodically to create cyclic gas circulation patterns. This periodic movement ensures continuous refreshment of the gas environment around the sensor without requiring the container to be open, thereby maintaining both protection and gas circulation efficiency through repeated cycles of substrate movement.
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 actuator-driven convection ensures continuous gas circulation around the sensor, enhancing its sensitivity and selectivity by preventing residual gas accumulation, allowing for accurate detection of diverse gas species, even in miniature devices like smartphones and smart watches.
Implementation Method 1
The actuator is coupled to the substrate and can cause convection of a gas within the container by enabling movements of the substrate in response to an activation signal
Implementation Method 2
using piezo-electric, thermal bi-stable, or shape memory alloy actuators
Data Source
AI summary
A gas-sensing apparatus with gas convection capability includes a gas sensor mounted inside a container, a substrate forming a bottom plate of the container and an actuator. The gas sensor is mounted over a first surface of the substrate internal to the container. The actuator is coupled to a second surface of the substrate external to the container. The actuator can cause convection of a gas within the container by enabling movements of the substrate in response to an activation signal.