Gemstone Grading System Using Spectral Modulation
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Solution Overview
Problem
Current gemstone grading systems are costly and inaccurate, especially when grading cut polished gemstones, as they fail to provide reliable color grading and are expensive due to the high cost of spectroscopic equipment.
Innovation Solution
A system comprising monochromatic light sources with a light modulator and a pixilated light sensor that modulates light according to spectral-specific modulation, allowing for simultaneous illumination and detection of gemstones, generating a transmittance spectrum for accurate color and clarity grading, which can be processed by a data processor to provide a color grade and clarity grade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spectroscopy based systems are used for gemstone grading, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The system divides the spectrum into multiple discrete wavelength bands using separate monochromatic light sources (LEDs or lasers) at specific wavelengths (e.g., 450nm, 530nm, 630nm). Each light source is independently controlled and modulated, allowing the system to measure transmittance at multiple spectral points without requiring a complex continuous spectrograph or diffraction grating assembly.
Solution Approach 2:
The patent replaces expensive, complex spectroscopic equipment with simpler, cheaper monochromatic light sources such as LEDs or laser diodes. These components are significantly less costly than traditional spectrographs while providing sufficient spectral resolution for gemstone color grading. The system uses multiple discrete wavelength sources rather than a single complex dispersive instrument.
2Measurement precision
If multiple light sources are used for spectral illumination, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple monochromatic light sources (each emitting at a different wavelength) into a single illumination system that can be controlled by a single controller. The controller simultaneously or sequentially activates different LED or laser diode sources, and the single detector collects transmittance data for all wavelengths, merging multiple measurement functions into one integrated system.
Solution Approach 2:
The system uses temporal modulation of individual light sources at distinct frequencies (e.g., 100Hz, 200Hz, 300Hz for different wavelengths). This periodic switching allows the single detector to distinguish between different wavelength components through frequency analysis, enabling spectral resolution without requiring spatial or optical separation of the light sources.
3Device complexity
If manual gemstone grading is performed, then device complexity is reduced, but measurement precision and reliability deteriorate
Solution Approach 1:
The system automatically performs the complete gemstone grading process without requiring manual intervention. The controller automatically activates light sources, the detector automatically measures transmittance, and the system automatically processes data to generate color and clarity grades. This eliminates the need for human graders while providing consistent, reliable, and objective measurements.
Solution Approach 2:
The patent replaces the mechanical/manual process of human gemstone evaluation with an automated optical-electronic system. Instead of relying on human eyes and subjective judgment, the system uses monochromatic light sources, photodetectors, and digital signal processing to objectively measure and grade gemstone properties, substituting mechanical human operation with automated instrumental analysis.
4Measurement precision
If spectroscopic equipment is used, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent replaces expensive spectroscopic instruments with inexpensive monochromatic light sources such as LEDs or laser diodes that emit at specific wavelengths. These components cost a fraction of traditional spectrographs while providing sufficient spectral information for gemstone grading. The system uses multiple discrete wavelength sources rather than a single complex dispersive instrument.
Solution Approach 2:
The system changes the approach from using a single broadband light source with spectral dispersion (expensive) to using multiple narrowband monochromatic sources (cheap). By selecting specific wavelengths that are most relevant for gemstone color assessment (e.g., blue, green, red regions), the system achieves accurate color grading with lower-cost components that target only the critical spectral regions.
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 offers a simpler, less expensive, and accurate method for gemstone grading, capable of accurately assessing both rough and cut polished gemstones, reducing the need for manual estimation and providing reliable color and clarity grades.
Implementation Method 1
a light modulator for modulating light emitted by each light source to provide illumination that is modulated according to a spectral-specific modulation
Implementation Method 2
a light detection system for collecting light following interaction of the illumination with the gemstone
Implementation Method 3
a light detection system for collecting light following interaction of the illumination with the gemstone
Data Source
AI summary
Gemstone grading method including illuminating the gemstone by light having a plurality of spectral components, each modulated according to a spectrally specific modulation (e.g., of intensity, frequency, phase), collecting the light following interaction with the gemstone, extracting from the collected light a set of intensity values for a respective set of modulation parameter values to provide a transmittance spectrum, and an output indicative of the transmittance spectrum (e.g., color, clarity, fluorescence grade). A complementary system includes a plurality of monochromatic light sources and respective modulators for simultaneously illuminating a gemstone with a modulation spectrally specific for each light source, a detection system for collecting the light following interaction whose signals are fed via a communication system to a data processor configured to extract a set of intensity values for a respective set of modulation parameter values to provide a transmittance spectrum and an output indicative thereof.