Elongate Gas Sensor Element With Support Struts
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Solution Overview
Problem
Existing gas sensors on semiconductor substrates have limited sensitivity due to restricted surface area for gas contact and are mechanically weak, which can lead to damage from external shocks.
Innovation Solution
A gas sensor with an elongate sensor element extending across an opening in the substrate, featuring multiple exposed surfaces for increased sensitivity and a support structure with elongate struts to enhance mechanical robustness, allowing for both surface area expansion and structural support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor element is made elongate to increase surface area for gas contact, then sensitivity is improved, but mechanical robustness deteriorates
Solution Approach 1:
The sensor element is configured to extend across an opening in the substrate, utilizing the third dimension (vertical extension across the opening) to increase surface area for gas contact. This dimensional approach allows the sensor element to have both increased sensing surface area and maintained mechanical support through its span across the opening, resolving the contradiction between sensitivity and mechanical robustness.
2Measurement precision
If the sensor element extends across an opening to increase exposed surface area, then sensitivity improves, but structural weakness increases leading to potential damage from external shocks
Solution Approach 1:
A support structure is introduced as an intermediary element to provide mechanical support to the sensor element. The support structure comprises support legs that extend across the opening and are attached to the sensor element, acting as a mediator between the sensor element and the substrate to enhance structural integrity while maintaining the sensor element's extended configuration for increased sensitivity.
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 enhanced surface area for gas contact improves sensitivity, while the support structure prevents mechanical damage, enabling reliable operation in applications like supply chain monitoring and HVAC systems.
Implementation Method 1
a current is passed through the sensor element 4. This causes the sensor element 4 to heat up... the heated sensor element 4 will reach thermal equilibrium at a certain corresponding temperature. This equilibrium temperature can be determined by measuring the resistance of the sensor element 4.
Implementation Method 2
The heater is includes a resistive element 14 through which a current is passed via a pair of electrical terminals 12. The purpose of the heater 14 in this example is to compensate for changes in ambient temperature by acting as a reference resistance.
Data Source
Figure 1~2B
Figure 3A~4C
Figure 5A~5C
AI summary
A gas sensor on a semiconductor substrate. The gas sensor includes an elongate sensor element extending across an opening and has first and second opposed surfaces exposed for contact with a gas to be sensed. The first surface faces away from a major surface of the substrate. The second surface faces toward said major surface. The electrical conductivity of the elongate sensor element is sensitive to a composition and/or concentration of said gas to which the opposed first and second surfaces are exposable. The gas sensor further includes a support structure arranged to increase the mechanical robustness of the gas sensor by supporting the elongate sensor element in the opening.