Displacement Sensor Cover Sheet Elastic Modulus Curvature
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Solution Overview
Problem
Strain sensors can incur irreversible curvature during storage, leading to changes in sensor characteristics that affect detection accuracy.
Innovation Solution
A displacement sensor configuration featuring a base member with a sensor sheet and a detachable cover sheet having a higher elastic modulus than the base member, which suppresses curvature and maintains sensor characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the strain sensor is stored in a curved state, then it can be easily stored and transported, but irreversible curvature remains and detection accuracy deteriorates
Solution Approach 1:
A cover sheet with higher elastic modulus than the base member is provided in advance to prevent curvature formation during storage. The cover sheet acts as a preemptive countermeasure that maintains the sensor sheet in a flat state, preventing irreversible curvature before it can occur.
Solution Approach 2:
The elastic modulus parameter is strategically varied by selecting a cover sheet material with a higher elastic modulus than the base member. This parameter change creates a stiffness differential that suppresses curvature while allowing the sensor to maintain its flat configuration during storage.
2Adaptability or versatility
If the sensor sheet is made flexible to conform to curved surfaces, then it can be easily applied, but it develops irreversible curves during storage
Solution Approach 1:
The sensor system is segmented into functionally distinct components: a flexible sensor sheet for measurement and a rigid cover sheet for structural support. This segmentation allows each component to perform its specialized function—the sensor sheet maintains conformability while the cover sheet provides shape stability during storage.
Solution Approach 2:
The sensor assembly combines materials with different elastic moduli to create a composite structure. The cover sheet material is selected to have higher elastic modulus than the base member, creating a composite system that balances flexibility for application with rigidity for storage stability.
3Reliability
If the cover sheet is made rigid to suppress curvature, then sensor characteristics are maintained, but it becomes difficult to detach and attach
Solution Approach 1:
The elastic modulus of the cover sheet is optimized to be higher than the base member to suppress curvature, but not excessively high to maintain detachability. This parameter optimization achieves a balance where the cover sheet is sufficiently rigid to prevent curvature but not so rigid as to prevent proper attachment and detachment operations.
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 solution effectively prevents curvature and maintains sensor accuracy by using a cover sheet with a higher elastic modulus than the base member, ensuring reliable measurements.
Implementation Method 1
an elastic modulus of the first cover sheet is larger than an elastic modulus of the base member... the cover sheet is less likely to deform than the base member
Data Source
AI summary
A displacement sensor that includes: a sensor unit including a base member having a first main surface and a second main surface opposite the first main surface, and a sensor sheet on the first main surface of the base member, the sensor sheet configured to measure a displacement amount of the base member; and a first cover sheet detachably attached to the sensor sheet on a side thereof opposite to the base member, wherein an elastic modulus of the first cover sheet is larger than an elastic modulus of the base member.