Optical Interferometric Sensing for Small Sample Deformation
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Solution Overview
Problem
Existing image-based tracking methods for measuring sample deformation are computationally demanding, costly, and struggle to accurately quantify small deformations due to insufficient resolution and alignment requirements, which complicates the measurement process and reduces throughput.
Innovation Solution
An optical sensing device with an optical waveguide forming an interferometric cavity with a refractive index discontinuity at the sample surface, allowing for high-resolution measurement of optical path length variations through spectral analysis, enabling real-time monitoring of deformation without precise alignment or costly hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If image-based tracking with microscope camera is used to measure sample deformation, then measurement capability is achieved, but measurement precision is insufficient for small deformations due to large pixel size
Solution Approach 1:
The patent replaces the mechanical/image-based measurement system with an optical interferometric system. Instead of using a microscope camera to capture images and analyze pixel positions, the invention uses optical interference patterns to directly measure displacement with nanometer-scale precision. The interferometric setup converts mechanical displacement into optical path length changes, which are then detected through spectral analysis, eliminating the need for complex image processing hardware and software.
Solution Approach 2:
The patent changes the measurement parameter from spatial resolution (pixel size) to optical path length sensitivity. By using interferometry, the system measures displacement through changes in optical path length rather than through spatial positioning of pixels. This parameter transformation allows achieving sub-nanometer resolution independent of detector pixel size, as the optical interference pattern provides amplified sensitivity to small displacements.
2Productivity
If image analysis is used to track sample deformation, then deformation measurement is achieved, but processing time is excessive making experiments slow
Solution Approach 1:
The patent replaces computationally intensive image analysis with direct optical measurement. Instead of capturing images, processing them through algorithms, and extracting displacement information, the interferometric system directly converts displacement into measurable optical signals. This substitution eliminates the computational bottleneck and provides real-time measurement feedback, dramatically improving experiment throughput.
3Measurement precision
If subpixel detection algorithms are used to increase resolution, then measurement precision improves, but alignment precision requirements become excessively strict
Solution Approach 1:
The patent replaces subpixel detection algorithms with optical interferometry that inherently provides high precision without strict alignment requirements. The interferometric cavity design with the optical waveguide and sample surface creates a measurement system where the optical path length is directly coupled to sample displacement. This mechanical-optical coupling provides robustness against misalignment, as the interference measurement remains valid as long as the optical components maintain their relative positions, eliminating the need for subpixel-level alignment precision.
4Measurement precision
If image analysis hardware and software are used to measure deformation, then measurement capability is achieved, but system cost is high
Solution Approach 1:
The patent replaces expensive image analysis hardware and software with a simpler optical interferometric system. The measurement capability is achieved through fundamental optical interference principles rather than through complex computational imaging systems. This substitution eliminates the need for high-end microscope cameras, specialized image processing software, and associated computational resources, providing a more cost-effective solution while maintaining or improving measurement precision.
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 method provides significantly higher resolution and accuracy in measuring deformation, simplifies the measurement process, reduces costs, and allows real-time monitoring of stimulus-response relationships with minimal data requirements.
Implementation Method 1
an optical waveguide fixedly arranged with respect to the support whereby an end of the optical waveguide faces the aperture so that the end is adapted to form an optical interferometric cavity with a refractive index discontinuity at a surface of the portion of the sample
Data Source
AI summary
An optical sensing device includes a support with an aperture. The optical sensing device can removably hold a sample against the support around the aperture. Accordingly, a portion of the sample is free to deform through the aperture in response to a change in an environmental condition. An optical waveguide is fixedly arranged with respect to the support whereby an end of the optical waveguide faces the aperture. The end of the optical waveguide forms an optical interferometric cavity with a refractive index discontinuity at a surface of the portion of the sample that is free to deform through the aperture.