Gemstone Inclusion Detection via Refractive Index Matching
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Solution Overview
Problem
Current methods for determining the location and size of internal flaws in gemstones, particularly diamonds, are hindered by the high refractive index causing multiple light refractions and reflections, making it difficult to accurately assess the value and potential for polishing, especially in rough stones.
Innovation Solution
A method and apparatus using an optical probe to scan the external structure of the gemstone, followed by immersion in a medium with a refractive index matching that of the gemstone to minimize refractions and reflections, allowing for precise detection of inclusions and their geometry relative to the external surface, and determining optimal sawing planes for maximizing value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If optical methods are used to detect flaws in gemstones, then the detection capability is improved, but the high refractive index of gems causes large refractions and total internal reflections resulting in multiple deflected images of the flaws
Solution Approach 1:
The patent introduces an immersion medium with a refractive index matched to the gemstone as an intermediary between the light source and the gemstone. This mediator eliminates refractions and total internal reflections at the gemstone surfaces, allowing clear detection of internal flaws without multiple deflected images
Solution Approach 2:
The patent changes the optical parameter (refractive index) of the environment surrounding the gemstone by using an immersion medium. By matching the refractive index of the immersion medium to that of the gemstone, the optical path is modified to eliminate unwanted refractions and reflections while maintaining the gemstone's internal optical properties
2Reliability
If manual visual examination by experts is used, then the assessment is based on experience and industry rules, but it is subjective and varies between different individuals and circumstances
Solution Approach 1:
The patent replaces the manual visual examination system with an automated optical detection system. This substitution eliminates human subjectivity by using optical instruments and image processing to objectively detect and locate flaws, providing consistent and reproducible results across different evaluations
3Measurement precision
If manual examination of each stone in a parcel is performed, then individual stone quality can be assessed, but it takes a long time so that the parcel value is deduced upon examination of representative stones only
Solution Approach 1:
The patent enables continuous evaluation of multiple gemstones by using an automated optical system that can quickly process each stone without manual intervention. The system maintains continuous operation through automated imaging and analysis, allowing all stones in a parcel to be evaluated individually rather than relying on representative samples
4Ease of operation
If conventional optical methods are used on rough stones, then the detection process is simplified, but it is often virtually impossible to see, much less locate, internal flaws
Solution Approach 1:
The patent uses an immersion medium as an intermediary to enable detection of internal flaws in rough stones. The matched refractive index eliminates surface refractions that would otherwise obscure internal features, making it possible to see and locate flaws in stones that appear opaque or translucent under conventional examination
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 reliable and accurate localization of inclusions within gemstones, improving the assessment of their value and potential for polishing by reducing deflected images and enhancing the precision of determining optimal cutting planes.
Implementation Method 1
immersion in a medium with a refractive index matching that of the gemstone to minimize refractions and reflections
Data Source
AI summary
An apparatus for determining location of at least one inclusion in a gemstone having a first refractive index, comprising:a container adapted for containing a material having a second refractive index,a holder operative to support a gemstone in the material when the container contains the material;an illuminator positioned and adapted to illuminate said gemstone when disposed within said material in said container, with illumination at which said gemstone and said material have their respective first and second indices;a detector that detects illumination from the illuminated gemstone and said material and produces signals responsive thereto;a controller that receives the signals and is operative to determine a location of an inclusion in the gemstone based on the signals; anda system, operative to reduce the presence within said material, at least when the gemstone is disposed therein, of any substance other than inclusions, having a third refractive index.