Micro Displacement Sensor Using Segmented Photonic Crystal Modules
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Solution Overview
Problem
Micro displacement sensors based on photonic crystals face limitations in achieving a wide dynamic range for displacement measurement, particularly struggling to measure relative displacements beyond a twofold order of the lattice constant.
Innovation Solution
The design incorporates multiple photonic crystal modules with light-guide channels and a light source, where the relative movement between modules affects light coupling efficiency, allowing for a sinusoidal correlation between displacement and light intensity, enabling a measurement range over a tenfold order of the lattice constant with high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photonic crystal modules are used for displacement measurement, then sensitivity is improved, but measurement range is limited
Solution Approach 1:
The photonic crystal structure is segmented into multiple modules (first photonic crystal module, second photonic crystal module, and third photonic crystal module) arranged in sequence. Each module contains photonic crystals disposed on substrates that form light-guide channels. This segmentation allows the system to maintain high sensitivity through photonic band gap effects in each module while extending the overall measurement range by combining multiple modules, achieving a measurement range exceeding tenfold the lattice constant.
2Adaptability or versatility
If multiple photonic crystal modules are connected in sequence, then measurement range is extended, but device complexity increases
Solution Approach 1:
Multiple photonic crystal modules are merged in sequence to form an integrated displacement measurement system. The first photonic crystal module, second photonic crystal module, and third photonic crystal module are connected such that light-guide channels extend continuously through all modules. This merging approach extends the measurement range while maintaining a relatively simple modular structure that can be manufactured using standard photonic crystal fabrication techniques.
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
This configuration enhances the dynamic range of displacement measurement while maintaining high sensitivity, achieving a resolution of less than 0.01 lattice constants and expanding the measurement range significantly.
Implementation Method 1
Because photonic crystals have photonic band gaps (PBGs), micro displacement sensors based on the photonic crystals are extensively being developed
Implementation Method 2
the relative movement between modules affects light coupling efficiency, allowing for a sinusoidal correlation between displacement and light intensity
Data Source
AI summary
A micro displacement sensor includes a first photonic crystal module, a second photonic crystal module, a light source and a detector. The first photonic crystal module includes a first substrate and a plurality of first photonic crystals, disposed on the first substrate and are arranged in a matrix. The first photonic crystals define a first light-guide channel having a light input end and a light output end. The second photonic crystal module includes a second substrate, disposed parallel to the first substrate, and a plurality of second photonic crystals, disposed on the second substrate and are arranged in a matrix. The second photonic crystals define a second light-guide channel having a light coupling end and a light detected end. The light source is disposed adjacent to the light input end. The detector is disposed adjacent to the light detected end.