Diamond Type Identification via Spin Property Correlation
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Solution Overview
Problem
The increasing difficulty in distinguishing natural diamonds from synthetic and treated diamonds due to advancements in CVD and HPHT technologies, leading to unreliable authentication methods and potential fraudulent activities.
Innovation Solution
A process and system utilizing optically detected magnetic resonance to measure spin properties, including resonance frequency, broadening, and spin lifetime, to determine the type of a diamond by comparing these properties with known types, employing a magnetic field generator, microwave frequency generator, excitation laser module, and fluorescence detector to provide a correlation-based output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional optical methods (FTIR and Raman spectroscopies) are used to distinguish natural diamonds from synthetic diamonds, then authentication can be performed with existing equipment, but the reliability and accuracy of authentication deteriorates due to the great advance in CVD and HPHT technologies making discernment increasingly difficult
Solution Approach 1:
The patent changes the measurement parameters from traditional optical properties (FTIR, Raman) to spin properties (resonance frequency, broadening, spin lifetime) that are insensitive to the improvements in CVD and HPHT technologies. This parameter change allows reliable differentiation between natural and synthetic diamonds despite technological advances in synthetic diamond production.
Solution Approach 2:
The patent replaces traditional optical detection methods with optically detected magnetic resonance (ODMR) technology. This substitution introduces a new physical mechanism (magnetic resonance) that provides distinct spin property signatures for different diamond types, overcoming the limitations of optical methods在面对 advanced synthetic diamond technologies.
2Manufacturing precision
If CVD and HPHT technologies are advanced to produce high-quality synthetic diamonds, then manufacturing capability and quality of synthetic diamonds are improved, but the ability to distinguish them from natural diamonds deteriorates
Solution Approach 1:
The patent measures spin properties (resonance frequency, broadening, spin lifetime) rather than traditional optical or physical properties. These spin properties provide unique signatures that remain distinct between natural and synthetic diamonds even as manufacturing precision of synthetic diamonds improves, thus maintaining measurement precision for type identification.
3Manufacturing precision
If low grade natural diamonds are treated with HPHT to become high grade diamonds, then the value and quality of treated diamonds are improved, but the accuracy of determining whether a diamond is naturally occurring deteriorates
Solution Approach 1:
The patent measures spin properties that are affected by HPHT treatment. The spin properties (resonance frequency, broadening, spin lifetime) of HPHT-treated diamonds show characteristic changes that differ from both natural and CVD/HPHT synthetic diamonds, enabling accurate detection of treated diamonds despite their improved quality and grade.
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
Effectively differentiates between natural diamonds, CVD synthetic diamonds, HPHT synthetic diamonds, and treated diamonds, enhancing authentication accuracy and reliability, thereby preventing fraudulent activities and ensuring accurate valuation.
Implementation Method 1
determining the spin properties of a diamond of unknown type, using optically detected magnetic resonance to measure the spin properties of said diamond
Implementation Method 2
an excitement laser module for applying a laser input signal to said diamond, wherein said excitement laser module excites NV− centres or other C centres within the diamond
Implementation Method 3
a fluorescence detector for detecting and acquiring the intensity of fluorescence from said NV− centres or other C centres of the diamond
Data Source
AI summary
A process for determining the type of a diamond having spin properties and physical properties, said process including the steps of: (i) determining the spin properties of a diamond of unknown type, using optically detected magnetic resonance to measure the spin properties of said diamond of an unknown type, wherein the spin properties are indicative of the physical properties of the diamond; (ii) comparing the spin properties of said unknown diamond with the spin properties of a plurality of diamonds of known types; and (iii) determining the type of said diamond of unknown type upon a predetermined threshold of correlation between the spin properties of said diamond of unknown type with the spin properties of a diamond of known type of said plurality of diamonds known types.