Micropillar Sensor Assembly for Force Detection
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Solution Overview
Problem
Existing micropillar sensors are fragile and prone to contamination, making them insensitive to small external changes and not robust, limiting their use due to the need for large forces to induce observable movement and the susceptibility of liquid crystal materials to contamination.
Innovation Solution
A sensor assembly comprising a light source, a modulation layer with perpendicular sets of micropillars, and detectors to determine the magnitude and direction of external forces by measuring changes in light intensity as the micropillars bend in response to forces, using piezo-electric materials and a controller to process the signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid crystal material is used to surround micropillars for light modulation, then light transmission can be controlled to produce signals, but the sensor becomes fragile and susceptible to contamination
Solution Approach 1:
The patent removes the liquid crystal material from the sensor structure, extracting the problematic component that caused fragility and contamination susceptibility while retaining the core micropillar light modulation mechanism. This eliminates the harmful effects associated with liquid crystal contamination.
Solution Approach 2:
The patent employs a simpler, more robust micropillar structure without fragile liquid crystal materials, effectively replacing complex, contamination-prone components with a more durable alternative that can withstand harsher environments and repeated use.
2Measurement precision
If large forces are required to induce observable micropillar movement, then signal production is enabled, but sensitivity to small external changes is reduced
Solution Approach 1:
The patent utilizes optical properties and light interaction changes (analogous to color changes) as micropillars respond to forces, enabling detection of small deformations through optical signal variations rather than requiring large physical displacements. The light modulation detects subtle changes in micropillar position or shape.
Solution Approach 2:
The patent employs light as a probe to detect micropillar responses, where even small mechanical deformations caused by minimal forces can be amplified and detected through optical interference or light path changes, enhancing sensitivity to small external stimuli.
3Measurement precision
If liquid crystal material is used for light modulation, then light transmission control is achieved, but the sensor becomes insensitive to small external changes when contaminated
Solution Approach 1:
The patent removes the liquid crystal material that caused contamination issues and subsequent loss of sensitivity, eliminating the root cause of the problem while preserving the micropillar-based light modulation capability for detecting external changes.
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 sensor assembly effectively measures both the magnitude and direction of external forces with high sensitivity and robustness, overcoming the limitations of fragile and contaminated micropillar sensors by using a piezo-electric material-based light modulation layer and precise light detection.
Implementation Method 1
using piezo-electric materials and a controller to process the signals
Implementation Method 2
measuring changes in light intensity as the micropillars bend in response to forces
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A sensor assembly includes a light source, a modulation layer, and at least one detector. The modulation layer includes a plurality of micropillars each having a fixed end and a free end. The fixed ends are each adjacent to the light source. The at least one detector is adjacent to the free ends of the plurality of micropillars. The detector is configured to detect light emitted from the light source.