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A line-scan hyperspectral system for high-throughput Raman chemical imaging.
- Source :
-
Applied spectroscopy [Appl Spectrosc] 2014; Vol. 68 (6), pp. 692-5. - Publication Year :
- 2014
-
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 beam splitter reflects the laser light to form a 24 cm × 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 to 2889.0 cm(-1) and a 23 cm wide area. An example application for authenticating milk powder is presented to demonstrate the system performance. In 4 min the system acquired a 512 × 110 × 1024 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.
- Subjects :
- Animals
Equipment Design
Guanidines analysis
High-Throughput Screening Assays methods
Milk chemistry
Powders
Specimen Handling instrumentation
Spectrum Analysis, Raman methods
Triazines analysis
Dairy Products analysis
Food Contamination analysis
High-Throughput Screening Assays instrumentation
Image Interpretation, Computer-Assisted instrumentation
Spectrum Analysis, Raman instrumentation
Subjects
Details
- Language :
- English
- ISSN :
- 1943-3530
- Volume :
- 68
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Applied spectroscopy
- Publication Type :
- Academic Journal
- Accession number :
- 25014726
- Full Text :
- https://doi.org/10.1366/13-07411