30 March 2004 Portable multispectral fluorescence imaging system for food safety applications
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Proceedings Volume 5271, Monitoring Food Safety, Agriculture, and Plant Health; (2004); doi: 10.1117/12.516103
Event: Optical Technologies for Industrial, Environmental, and Biological Sensing, 2003, Providence, RI, United States
Abstract
Fluorescence can be a sensitive method for detecting food contaminants. Of particular interest is detection of fecal contamination as feces is the source of many pathogenic organisms. Feces generally contain chlorophyll a and related compounds due to ingestion of plant materials, and these compounds can readily be detected using fluorescence techniques. Described is a fluorescence-imaging system consisting primarily of a UV light source, an intensified camera with a six-position filter wheel, and software for controlling the system and automatically analyzing the resulting images. To validate the system, orchard apples artificially contaminated with dairy feces were used in a "hands-on" public demonstration. The contamination sites were easily identified using automated edge detection and threshold detection algorithms. In addition, by applying feces to apples and then washing sets of apples at hourly intervals, it was determined that five h was the minimum contact time that allowed identification of the contamination site after the apples were washed. There are many potential uses for this system, including studying the efficacy of apple washing systems.
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Alan M. Lefcourt, Moon S. Kim, Yud-Ren Chen, "Portable multispectral fluorescence imaging system for food safety applications", Proc. SPIE 5271, Monitoring Food Safety, Agriculture, and Plant Health, (30 March 2004); doi: 10.1117/12.516103; https://doi.org/10.1117/12.516103
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KEYWORDS
Forward error correction

Cameras

Contamination

Optical filters

Image filtering

Imaging systems

Luminescence

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