Speckle Analysis System for Subwavelength Displacement
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Solution Overview
Problem
Existing technologies face challenges in precisely measuring surface contours and changes, especially when electrical isolation is difficult due to grounding issues, and optical sensors fall short in providing absolute measurements.
Innovation Solution
An ultra-sensitive speckle-analyzing system utilizing a strongly scattering layer as a scattering analyzer, which captures and cross-correlates speckle patterns to detect subwavelength in-plane displacement, enhancing sensitivity to translational and internal changes without contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact sensors such as strain gauges are attached to the object for measurement, then measurement precision is improved, but electrical isolation becomes difficult due to grounding issues and the sensor may be damaged by environmental conditions
Solution Approach 1:
The patent introduces an optical intermediary system consisting of a light source, optical path, and camera sensor that mediates the measurement process without direct electrical contact with the object. The optical field serves as the intermediary carrier of measurement information, eliminating grounding issues while maintaining measurement precision through optical interaction with the object's surface.
Solution Approach 2:
The patent replaces mechanical/electrical contact sensors with an optical measurement system. Instead of using strain gauges that require electrical connections and physical attachment, the system uses light interaction with the object's surface to obtain measurement data, thereby eliminating electrical isolation problems and improving reliability in harsh environments.
2Reliability
If no-contact capacitive or inductive sensors are used, then electrical isolation is improved, but the distance between sensor and object must be extremely small which limits deployment flexibility
Solution Approach 1:
The patent replaces capacitive and inductive sensors with an optical measurement system that uses light fields instead of electromagnetic fields for sensing. This substitution allows for greater working distances and improved deployment flexibility while maintaining electrical isolation, as optical systems are not subject to the same proximity constraints as capacitive or inductive sensors.
3Ease of operation
If optical sensors based on interferometer principles are used, then non-contact measurement is achieved, but absolute surface measurement capability is lost
Solution Approach 1:
The patent segments the optical measurement approach into two distinct functional components: an illumination system that provides structured light patterns and a detection system that captures the reflected patterns. This segmentation allows the system to maintain non-contact operation while recovering absolute surface measurement capability through pattern analysis and correlation techniques that are independent of interferometric phase measurements.
Solution Approach 2:
The patent substitutes interferometric measurement principles with optical correlation-based measurement. Instead of relying on interference patterns that provide only relative displacement information, the system uses correlation analysis of structured light patterns to achieve both non-contact operation and absolute surface measurement capability.
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 system achieves far-subwavelength motion sensitivity, breaking the diffraction limit in spatial resolution, and is applicable for remote detection of vibration, expansion, or deformation of objects, offering a novel approach for precise surface contour measurement.
Implementation Method 1
receive a scattered field having a speckle configuration and thereby capture i) a reference speckle image, and ii) a subsequent speckle image
Data Source
AI summary
An ultra-sensitive speckle-analyzing system is disclosed which includes an image capture device configured to receive a scattered field having a speckle configuration and thereby capture i) a reference speckle image, and ii) a subsequent speckle image, each of the reference and the subsequent speckle images having a plurality of speckles on a background; and a processor configured to generate a cross-correlation between the plurality of speckles of the reference and the subsequent speckle images, to thereby represent a change in the speckle configuration.