USDA Agricultural Research Service (ARS) scientists have developed and patented an advanced experimental optical scanning system to be used in fresh produce packinghouses to detect defects and contaminants on the exterior of fresh produce or other items.
The system uses the capabilities of a type of camera known as a high-speed multispectral/hyperspectral line-scanner. Positioned above a conveyor belt, the scanner captures images of each fast-moving item, such as an apple. Each apple is exposed simultaneously to ultraviolet light from a UV fluorescent lamp and near infrared light from a halogen lamp. The near infrared light that bounces off the apple can be captured by a spectrograph and analyzed for tell-tale patterns of defects, while the UV light beamed on the apple can disclose the whereabouts of contaminants.
The system combines information from both forms of illumination into a single image with contaminant and defect results. When linked to a sorting machine, the system can signal the sorter to separate the problem apples from others.
Currently, the system can scan about three to four apples per second and provide a 180-degree view of each apple's exterior. The scientists are working to improve the process so it will provide a 360-degree whole-surface view for thorough inspection
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Sources:
ARS: High-Tech Approach Uses Lights, Action and Camera to Scrutinize Fresh Produce
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