More Raman Analyses Less Fluorescence Interference

Feb 11, 2011

Duyen Nguyen and Eric Wu, Enwave Optronics, Inc.

In recent years, the spectroscopy community has observed rapid development of Raman instrumentation and its usefulness in a variety of applications. Routine Raman analysis with 785 nm excitation has served well for the great majority of industrial applications and has become the most favored instrument configuration. Nevertheless, the need still persists for further reduction of fluorescence interference in many important applications containing fluorescent samples.

Continuing the success of the ProRaman Series, Enwave Optronics recently announced the implementation of the ProRaman-L9 Series instruments with excitation wavelength around 900 nm for analysis of materials prone to fluorescence interference. The deployment of ProRaman-L9 has proven to be invaluable for various applications requiring further fluorescence reduction from using 785 nm excitation.

Experiment

The samples chosen for this experiment were red wine and wheat flour, both of which were previously reported unable to be analyzed by 785 nm Raman instruments (due to fluorescence). The samples were measured using ProRaman-L-785 and ProRaman-L9. Both of the ProRaman instruments were equipped with a fiber optics probe for sample interface. The red wine sample was kept in a quartz cuvette during data collection. Whole wheat flour was measured using a sapphire lens probe for direct measurement with the sample in a plastic bag.


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