High-Resistance Sensor Structure for Low-Power Force Measurement
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Solution Overview
Problem
Existing force-sensitive sensors face issues with power consumption and measurement accuracy due to variations in trace resistances, leading to calibration drift and cross-channel effects, which result in signal noise and errors.
Innovation Solution
A high-resistance sensor design incorporating low-resistance materials separated by a gap with a high-resistance material positioned within, forming a circuit upon stimulus application, mitigating stray impedances and increasing sensitivity and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low-resistance materials are used for conductors and traces in force-sensitive sensors, then power consumption is reduced, but measurement accuracy deteriorates due to calibration drift and cross-channel effects
Solution Approach 1:
The sensor structure is segmented into distinct layers: a first conductor layer with low-resistance material, a high-resistance sensing layer, and a second conductor layer with low-resistance material. This segmentation allows each layer to perform its specific function optimally - the low-resistance conductor layers minimize power consumption while the high-resistance sensing layer provides accurate force measurements by being more sensitive to deformation.
Solution Approach 2:
The sensor employs a composite structure combining materials with different resistance properties. The conductor layers use low-resistance materials (such as copper or silver) to minimize power consumption, while the sensing layer uses high-resistance material (such as conductive polymer or carbon-based material) that exhibits significant resistance change under force, thereby resolving the contradiction between power efficiency and measurement accuracy.
2Measurement precision
If high-resistance material is used in the sensing circuit, then measurement accuracy and resolution are improved, but power consumption increases
Solution Approach 1:
The sensor structure applies local quality by using high-resistance material specifically in the sensing layer where force detection occurs, while using low-resistance material in the conductor layers for power-efficient signal transmission. The high-resistance sensing layer is positioned between the conductor layers, ensuring that only the critical sensing region has high resistance, thereby maintaining measurement accuracy without excessive power consumption.
Solution Approach 2:
The sensor is segmented into functional zones: power-efficient conductor layers for signal transmission and a high-resistance sensing layer for accurate force detection. This segmentation allows the high-resistance material to be confined to the minimum necessary region, reducing overall power consumption while maintaining measurement accuracy where it is most needed.
3Volume of moving object
If conductor layers are placed close together to form a compact sensor, then device size is reduced, but stray impedance and cross-channel effects increase
Solution Approach 1:
The high-resistance sensing layer acts as an intermediary between the first and second conductor layers. This intermediary layer provides electrical isolation that reduces cross-channel effects and stray impedance, while still allowing mechanical force to transmit through it for sensing. The high-resistance property of this intermediary layer minimizes parasitic electrical interactions between the conductor layers.
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 high-resistance sensor reduces power consumption and enhances measurement accuracy by minimizing cross-channel effects and improving resolution through the use of a high-resistance material in the circuit path.
Implementation Method 1
A high-resistance material is positioned within the gap intermediate the first low-resistance material and the second low-resistance material. The high-resistance material increases the resistance of a circuit formed by contact between the first low-resistance material and the second low-resistance material when the sensor is subject to the stimulus.
Data Source
AI summary
A high-resistance sensor. The sensor includes a first low-resistance material and a second low-resistance material, each connected with a base material. The first low-resistance material and the second low-resistance material are separated by a gap. A stimulus causes the first low-resistance material and the second low-resistance to move toward each other. A high-resistance material is positioned within the gap intermediate the first low-resistance material and the second low-resistance material. The high-resistance material increases the resistance of a circuit formed by contact between the first low-resistance material and the second low-resistance material when the sensor is subject to the stimulus.