IoT Gas Sensor Heating Element Segmentation for Deformation Control
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Solution Overview
Problem
Conventional gas sensors in IoT devices face challenges with heating element deformation and power consumption, limiting their operating lifetime and thermal efficiency, especially when miniaturized for portable applications.
Innovation Solution
A novel heating element pattern with a top-view design featuring conductors embedded in an insulator over a substrate, with dimensions less than 4 micrometers, reduces displacement and deformation while maintaining thermal efficiency, achieved through specific material choices and etching techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the heating element is miniaturized for portable IoT devices, then the device size is reduced, but the heating element undergoes deformation and displacement
Solution Approach 1:
The heating element is divided into multiple segments separated by insulating gaps, transforming it from a continuous structure to a discontinuous one. This segmentation reduces thermal stress accumulation and prevents deformation while maintaining heating effectiveness in the miniaturized device
Solution Approach 2:
An insulating layer is introduced between the heating element segments and the substrate, acting as a mediator that provides thermal isolation and mechanical support. This intermediary prevents direct thermal contact that would cause deformation while maintaining the compact structure
2Temperature
If the heating element operates at high temperature for effective gas sensing, then the sensing performance is improved, but the power consumption increases
Solution Approach 1:
The heating element is designed to concentrate thermal energy locally at the sensing region rather than uniformly heating the entire structure. This localized heating approach achieves the required high temperature for gas sensing while minimizing overall power consumption
Solution Approach 2:
The heating element operates in periodic cycles, alternating between heating phases and cooling phases. This periodic operation reduces average power consumption while maintaining effective sensing temperature during the heating phases through thermal inertia
3Duration of action of moving object
If the heating element operates continuously for extended periods, then the sensing function is maintained, but the operating lifetime is reduced due to deformation
Solution Approach 1:
The segmented structure allows each section to expand and contract independently during thermal cycles, preventing cumulative deformation that would occur in a continuous heating element. This enables long-term continuous operation without reliability degradation
Solution Approach 2:
The insulating gaps between heating element segments act as pre-designed cushioning spaces that accommodate thermal expansion before deformation occurs. This beforehand cushioning prevents structural failure during extended operation
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 new heating element design enhances the operating lifetime and thermal efficiency of gas sensors in IoT devices by minimizing displacement and power consumption, allowing for effective temperature control in compact portable devices.
Implementation Method 1
a heating element, viewed from top, having a pattern including a plurality of openings, a minimal dimension of the opening being less than about 4 micrometer
Data Source
AI summary
The present disclosure provides a gas sensor. The gas sensor includes a substrate, an insulating layer over the substrate, a conductor layer over and in contact with a top surface of the substrate, and a gas sensing film. The conductor layer includes a conductive pattern having a plurality of openings, and the conductive pattern is embedded in the insulating layer. The gas sensing film is formed over a portion of the conductive pattern.