Screening Envelopes and Parcels for Illicit Materials with Agilent Resolve - a Handheld SORS System

Significance of the Topic

Effective detection of concealed illicit materials in mail and parcels is crucial for security, public safety, and law enforcement. Conventional inspection methods often require manual opening of packages, risking exposure to hazards and compromising sender privacy. A rapid, non-intrusive analytical tool capable of identifying hazardous substances through common packaging materials enhances operational efficiency and safety in mail screening environments.

Objectives and Study Overview

This study evaluates the performance of the Agilent Resolve handheld spatially offset Raman spectroscopy (SORS) system for non-destructive through-barrier chemical identification. Key aims include:

• Assessing the ability to detect and identify narcotics, pharmaceuticals, and benign chemicals within typical parcel materials.
• Determining analysis times and match reliability under different packaging conditions.

Methodology

Measurements were conducted using three acquisition modes:

• Through-barrier mode for thick, colored, or opaque packaging.
• Line-of-sight surface scan for opened or clear containers.
• Glass vial holder mode for direct sample interrogation.

All tests involved point-and-shoot operation with automatic scan time adjustment (approximately one minute per measurement) based on Raman signal strength. A spectral library matching algorithm provided the best-match result, with priority tagging available for targeted compounds.

Used Instrumentation

• Agilent Resolve handheld SORS Raman spectrometer.
• Proprietary spatially offset Raman spectroscopy technology.
• Compendium library of hazardous and benign chemical spectra.

Main Results and Discussion

Three case studies demonstrated accurate identification of:

• Acetaminophen powder inside a padded yellow envelope and plastic bag.
• Aspirin tablets within a padded white envelope and HDPE tub.
• Benzocaine powder concealed in a white HDPE pot.

In all scenarios, the system correctly identified the primary active component regardless of multiple packaging layers. Automatic exposure adjustments ensured consistent performance across varying barrier thickness and opacity.

Benefits and Practical Applications

• Non-invasive screening preserves package integrity and sender privacy.
• Rapid analysis (≈1 minute) accelerates mail processing workflows.
• Eliminates need for protective equipment or chemical handling facilities.
• Scalable to a wide range of hazardous materials including narcotics, explosives, and industrial toxins.

Future Trends and Potential Applications

Expansion of spectral libraries and integration with machine learning algorithms can improve specificity and reduce false positives. Miniaturization and cloud connectivity will enable real-time data sharing across security checkpoints. Potential extensions include automated conveyor integration and combination with complementary screening technologies for comprehensive threat detection.

Conclusion

The Agilent Resolve handheld SORS system delivers reliable, non-destructive identification of concealed chemicals through common parcel materials in under a minute. Its ease of use, speed, and broad applicability position it as a valuable tool for modern mail screening and field security operations.