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Diffuser-incorporated transmission NIR measurement for reliable analysis of packed granular samples
Jihye Yoon1, Jaejin Kim, Pham Khac Duy
1Department of Chemistry, College of Natural Sciences, Hanyang University, Seoul, 133-791, Korea.
The Analyst
|June 28, 2013
Summary
A new near-infrared (NIR) spectroscopy method uses a diffuser to improve spectral data from granular samples. This enhanced technique provides reliable results for polyethylene (PE) pellet density and rice origin discrimination.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Materials Science
Background:
- Transmission near-infrared (NIR) spectroscopy of granular samples can suffer from poor sample representation and reproducibility.
- Non-fully interacted radiation (NFIR) passing through void spaces in packings hinders accurate spectral collection.
- Existing methods require improvements for reliable analysis of packed granular materials.
Purpose of the Study:
- To develop a diffuser-incorporated transmission NIR scheme for enhanced spectral collection of granular samples.
- To improve sample representation and reproducibility in transmission NIR measurements.
- To evaluate the analytical utility of the new method for material characterization and origin discrimination.
Main Methods:
- Incorporated a polytetrafluoroethylene (PTFE) diffuser to introduce isotropically diffused NIR radiation into packed granular samples.
- Acquired transmission spectra from polyoxymethylene (POM) packings of varying particle sizes and thicknesses to identify issues.
- Optimized the sample packing and radiation interaction to minimize NFIR effects.
Main Results:
- The diffuser-incorporated scheme significantly improved the reproducibility of transmission spectra for packed granular samples.
- Accurate determination of polyethylene (PE) pellet density was achieved using the proposed method.
- Discrimination of rice samples based on geographical origin was more accurate with the enhanced NIR scheme.
Conclusions:
- The diffuser-incorporated transmission NIR method offers a reliable and reproducible approach for analyzing packed granular samples.
- This technique enhances the accuracy of material property determination and sample origin discrimination.
- The developed scheme represents a significant advancement in transmission NIR spectroscopy for granular materials.
