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

Jianwei Qin; Kuanglin Chao; Moon S. Kim

doi:10.1117/12.2050531

28 May 2014 High-throughput Raman chemical imaging for evaluating food safety and quality

Jianwei Qin, Kuanglin Chao, Moon S. Kim

Proceedings Volume 9108, Sensing for Agriculture and Food Quality and Safety VI; 91080F (2014) https://doi.org/10.1117/12.2050531
Event: SPIE Sensing Technology + Applications, 2014, Baltimore, MD, United States

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.

Citation Download Citation

Jianwei Qin, Kuanglin Chao, and Moon S. Kim "High-throughput Raman chemical imaging for evaluating food safety and quality", Proc. SPIE 9108, Sensing for Agriculture and Food Quality and Safety VI, 91080F (28 May 2014); https://doi.org/10.1117/12.2050531

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