Laser Spectroscopy for Bitumen Content in Ore Samples
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Solution Overview
Problem
Existing techniques for analyzing ore samples to determine bitumen content face challenges with low signal-to-noise ratios and varying accuracy due to changes in light levels, especially when using broadband illumination.
Innovation Solution
A spectroscopic analysis technique utilizing discrete wavelengths of illumination and optical filters, paired with lasers and matching filters, to improve the signal-to-noise ratio and accurately determine bitumen content by focusing on specific absorption bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If broadband illumination is used to illuminate the ore sample, then the measurement can cover a large spectral region, but the signal-to-noise ratio becomes very low
Solution Approach 1:
The broadband spectrum is segmented into multiple discrete wavelength bands, with specific emphasis on the 1750 nm and 2330 nm regions where bitumen exhibits characteristic absorption features. By concentrating measurement resources on these specific bands rather than attempting to measure the entire spectrum uniformly, the system achieves both spectral relevance and improved signal-to-noise ratio in the critical regions
Solution Approach 2:
The illumination source is designed to provide enhanced intensity at specific wavelengths (1750 nm and 2330 nm) rather than uniform broadband illumination. This local quality enhancement ensures that the discrete wavelengths corresponding to bitumen absorption bands receive sufficient photon flux to overcome noise, while other spectral regions receive reduced illumination
2Measurement precision
If artificial illumination is used to improve signal detection, then the signal-to-noise ratio improves, but the overall light levels vary causing measurement accuracy to change
Solution Approach 1:
The system employs periodic modulation of the illumination source at specific frequencies corresponding to the discrete wavelength bands. By modulating the light source periodically and using synchronous detection, the system can distinguish the modulated signal from background noise and drift, maintaining consistent measurements even when overall light levels vary due to environmental conditions
Solution Approach 2:
The system dynamically adjusts the intensity and wavelength distribution of the illumination source to compensate for varying environmental conditions. By monitoring reference bands and adjusting illumination parameters in real-time, the system maintains consistent signal-to-noise ratios across different operating conditions, ensuring measurement reliability
3Measurement precision
If discrete wavelengths are used to improve signal-to-noise ratio, then measurement accuracy improves, but the device complexity increases due to multiple lasers and filters
Solution Approach 1:
The system employs a single tunable laser source that can be adjusted to emit at multiple discrete wavelengths (including 1750 nm and 2330 nm) rather than requiring separate fixed-wavelength lasers for each band. This multi-functional approach allows one laser to perform the work of multiple lasers, significantly reducing device complexity while maintaining the ability to measure at all critical wavelengths
Solution Approach 2:
The system uses optical filters as intermediary components that selectively transmit only the desired discrete wavelength bands from the laser source to the detector. These filters act as mediators that simplify the optical path by blocking unwanted wavelengths, allowing the use of a broadband or tunable laser source while achieving the effect of multiple discrete wavelength sources with a single emitter
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
This approach significantly enhances the accuracy of bitumen content measurement by filtering out unwanted light and using discrete wavelengths to improve signal processing, maintaining a high signal-to-noise ratio even when scanning large areas.
Implementation Method 1
spectroscopic analysis technique that uses discrete wavelengths of illumination of an ore sample
Implementation Method 2
both correspond to absorption bands of bitumen
Implementation Method 3
narrow band optical filters that are centered to discrete laser wavelengths and used to filter out the unwanted light
Data Source
AI summary
The present invention provides a technique that uses discrete wavelengths of illumination of an ore sample, and through the use of optical filters and laser illumination the signal-to-noise ratio of the measurement can be greatly improved, and may take the form of apparatus featuring a signal processor configured to: receive signaling containing information about a spectral reflectance caused by discrete wavelengths illuminating an ore sample; and determine information about a bitumen content of the ore sample based at least partly on the signaling. The signal processor may provide corresponding signaling containing information about the bitumen content of the ore sample, including for further processing, printing or displaying.