Hybrid Strain Sensor Integration for Flexible High-Sensitivity Measurement
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Solution Overview
Problem
Current strain sensors, particularly in mobile and medical devices, face challenges in achieving high sensitivity due to limitations in Gauge Factor (GF) and the complexity and cost of using semiconductor strain gauges, which are often too rigid and difficult to integrate into compact spaces.
Innovation Solution
A hybrid strain sensing system that integrates semiconductor strain sensing resistors with a signal processing circuit on a substrate, leveraging the high sensitivity of semiconductor materials while incorporating flexibility and miniaturization, suitable for a wide range of applications including consumer electronics and medical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If semiconductor strain gauges are used to achieve high sensitivity, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the semiconductor strain gauge with the signal processing circuit into a single integrated device. The strain gauge elements are fabricated directly on the substrate along with the processing circuitry, eliminating the need for separate components and reducing integration complexity while maintaining high sensitivity measurement capabilities
Solution Approach 2:
The substrate serves multiple functions simultaneously: it acts as the structural base for the strain gauge, the platform for fabricating signal processing circuits, and the mechanical element that deforms under strain. This multi-functionality reduces the number of separate components needed and simplifies the overall device structure
2Measurement precision
If semiconductor strain gauges are used to achieve high sensitivity, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
By integrating the strain gauge and processing circuit on the same substrate using compatible fabrication processes, the patent enables simultaneous manufacturing of both components, reducing assembly steps and manufacturing cost while preserving the high sensitivity of semiconductor strain gauges
Solution Approach 2:
The patent modifies fabrication parameters to ensure compatibility between strain gauge deposition and circuit manufacturing processes, allowing both components to be produced in the same manufacturing line using standard semiconductor fabrication techniques, thereby reducing overall manufacturing cost
3Measurement precision
If rigid semiconductor strain gauges are used to achieve high sensitivity, then measurement precision is improved, but adaptability to flexible substrates deteriorates
Solution Approach 1:
The patent employs thin-film semiconductor strain gauges deposited on flexible substrates. The thin-film structure and flexible substrate combination allows the high-sensitivity semiconductor gauge to conform to curved or flexible surfaces while maintaining its piezoresistive sensing capability
Solution Approach 2:
The patent uses composite structures combining semiconductor material with flexible substrate materials. This composite approach allows the rigid semiconductor strain-sensitive layer to be mounted on flexible support, achieving both high measurement precision and adaptability to various mechanical configurations
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 hybrid system provides enhanced sensitivity and flexibility, enabling accurate strain measurement in compact spaces with reduced manufacturing complexity and cost, suitable for diverse applications from smartphones to medical devices.
Implementation Method 1
When a piezo-resistive material is used in a strain gauge, the conductivity, or resistivity, changes when the material is under stress
Implementation Method 2
by measuring the change of resistance, for example, using a Wheatstone bridge structure shown in FIG. 1c, the local strain, or applied force, may be calculated
Implementation Method 3
Any deformation of the substrate, as shown in FIG. 1b, will induce a change of resistance in the variable resistor
Data Source
AI summary
A hybrid strain sensing system and the method of making such a system provides a thin semiconductor film with strain sensors and signal processing circuits integrated deposited thereon. The semiconductor film may be further processed and then mounted onto a substrate to be used for strain, force, or other related measurements. The system combines the high sensitivity of a semiconductor strain gauge with the high level of integration of semiconductor integrated circuits (IC)s. Both are highly desirable features for applications where miniaturization and/or flexibility are important requirements.