Refractive-Index Matching Optical Window for Raman Spectrometry
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Solution Overview
Problem
Light scattering and refraction occur when testing samples in transparent containers due to surface roughness and curvature, leading to reduced light collection efficiency and image distortion in optical measurement systems.
Innovation Solution
An optical window with a flexible medium and substrate is used, where the flexible medium is deformed to match the container's surface profile, and the refractive indices of the medium and substrate are adjusted to fall within a specific range (0.75 to 1.25) to minimize scattering and refraction, allowing for improved light collection and imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rigid optical window is used to match the container surface, then light scattering and refraction are reduced, but the device cannot adapt to different container shapes and cannot be reused
Solution Approach 1:
The patent uses a flexible medium (such as a flexible membrane or thin film) instead of a rigid optical window. This flexible medium can be deformed to match the surface profile of different container shapes while maintaining optical contact, thereby reducing light scattering and refraction across various container geometries and enabling reuse.
Solution Approach 2:
The optical window is designed to be dynamic rather than static. The flexible medium can be deformed or adjusted to adapt to different container shapes, transforming the rigid structure into a flexible one that maintains optimal optical contact across varying geometries.
2Measurement precision
If the refractive index of the optical window is matched to the container, then light scattering is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes the ability to change the refractive index parameter of the flexible medium by adjusting its physical state (such as temperature, pressure, or composition). This allows the refractive index to be tuned to match different container materials, reducing light scattering while accommodating manufacturing variations through parameter adjustment rather than precise manufacturing alone.
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 solution enhances light collection efficiency and imaging quality in optical measurement systems by reducing light scattering and refraction, while allowing the optical window to be reused by detaching it from the container.
Implementation Method 1
The flexible medium is configured to be deformed with substantially the same profile as that of the outer surface of the container
Implementation Method 2
the substrate and flexible medium are configured to allow light to pass from the container to the measurement system through the optical window with a refractive index of a useful range such as 1.35 to 1.6
Data Source
AI summary
An optical window for an imaging system such as a Raman spectrometer, NIR spectrometer, fluorometer, or hyperspectral camera is configured to contact the subject. It includes: a substrate; and a flexible medium, where the flexible medium is configured to be deformed with substantially the same profile as that of the outer surface of the subject. The refractive index of the flexible medium and substrate is selected such that light collection efficiency and/or imaging quality returned to the measurement system increases after application of the optical window.