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Proceedings Paper

High-throughput Raman chemical imaging for evaluating food safety and quality
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Paper Abstract

A line-scan hyperspectral system was developed to enable Raman chemical imaging for large sample areas. A custom-designed 785 nm line-laser based on a scanning mirror serves as an excitation source. A 45° dichroic beamsplitter reflects the laser light to form a 24 cm x 1 mm excitation line normally incident on the sample surface. Raman signals along the laser line are collected by a detection module consisting of a dispersive imaging spectrograph and a CCD camera. A hypercube is accumulated line by line as a motorized table moves the samples transversely through the laser line. The system covers a Raman shift range of -648.7-2889.0 cm-1 and a 23 cm wide area. An example application, for authenticating milk powder, was presented to demonstrate the system performance. In four minutes, the system acquired a 512x110x1024 hypercube (56,320 spectra) from four 47-mm-diameter Petri dishes containing four powder samples. Chemical images were created for detecting two adulterants (melamine and dicyandiamide) that had been mixed into the milk powder.

Paper Details

Date Published: 28 May 2014
PDF: 6 pages
Proc. SPIE 9108, Sensing for Agriculture and Food Quality and Safety VI, 91080F (28 May 2014); doi: 10.1117/12.2050531
Show Author Affiliations
Jianwei Qin, USDA Agricultural Research Service (United States)
Kuanglin Chao, USDA Agricultural Research Service (United States)
Moon S. Kim, USDA Agricultural Research Service (United States)

Published in SPIE Proceedings Vol. 9108:
Sensing for Agriculture and Food Quality and Safety VI
Moon S. Kim; Kuanglin Chao, Editor(s)

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