Passive Curvature Sensor Using Interference Fringes
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Solution Overview
Problem
Conventional curvature sensors require an electrical or light source, leading to energy dissipation and inability to sense curvature variations remotely.
Innovation Solution
A non-energy dissipating curvature sensing device comprising a flexible outer and inner transparent layers with spacers, utilizing ambient light to detect curvature variations by producing interference fringes when pressed against a sample, allowing remote operation without energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional curvature sensors use electrical or light sources to sense curvature variation, then measurement capability is improved, but energy dissipation occurs and remote sensing becomes impossible
Solution Approach 1:
The curvature sensing device utilizes ambient light already present in the environment rather than requiring its own light source. The transparent layers and spacers create an interference pattern system that passively detects curvature changes using external light, enabling the device to sense curvature without consuming energy for illumination.
Solution Approach 2:
The patent replaces active optical components (light sources, cameras) with a passive optical interference system. By using transparent layers with different refractive indices and spacing elements, the device creates interference fringes that directly indicate curvature changes, eliminating the need for energy-consuming electrical or optical active components.
2Measurement precision
If conventional curvature sensors use electrical or light sources, then curvature detection is enabled, but remote operation becomes impossible
Solution Approach 1:
The device leverages ambient light from the environment as its operating resource, requiring no internal power source or active illumination components. This passive operation mode enables the sensing device to function remotely without requiring electrical connections or energy supply infrastructure at the measurement location.
3Measurement precision
If transparent layers are pressed against the sample to conform to the surface, then curvature measurement accuracy is improved, but device structure complexity increases
Solution Approach 1:
The patent employs flexible transparent layers that can be pressed against the sample surface to conform to its curvature. These thin film structures naturally adapt to surface geometry when applied, providing accurate surface following without requiring complex mechanical adjustment mechanisms or rigid structures.
Solution Approach 2:
The spacers act as intermediary elements between the transparent layers, maintaining controlled spacing to create the interference pattern. By positioning spacers at specific locations, the device achieves precise curvature measurement through interference fringe analysis while keeping the overall structure relatively simple and manageable.
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
Enables remote, energy-efficient curvature sensing by using ambient light to produce interference fringes, facilitating the determination of curvature variations and radius of curvature calculations.
Implementation Method 1
determining whether the non-energy dissipating, curvature sensing device senses a curvature variation in the sample is performed by determining if interference fringes are produced in the non-energy dissipating, curvature sensing device
Data Source
AI summary
A non-energy dissipating, curvature sensing device senses curvature variation of a sample and comprises an outer layer, an inner layer and at least one spacer. The outer layer is flexible, transparent material and has a shape. The inner layer is flexible, transparent material, has a shape corresponding to the shape of the outer layer, is positioned under the outer layer and is thicker and harder than the outer layer. At least one spacer is positioned between the outer layer and the inner layer and creates space between the outer layer and the inner layer. A non-energy dissipating, curvature sensing method is also disclosed.