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Home > Technologies > Separations/ Spectroscopy
Raman Analyzer Optimizes Wavelength RangeThe RamanRxn2. 1000 analyzer from Kaiser provides the fluorescence rejection of a FT-Raman spectrometer with the ease of fiber-optic interfacing of a dispersive Raman analyzer. Using 1000-nm excitation is a compromise between fluorescence rejection and detection sensitivity. For non-Raman spectroscopists, the observation of any level of fluorescence background can lead to the desire to move to a different excitation wavelength. However, it is often possible to remove the background during a data analysis step leaving a residual spectrum of high enough signal-to-noise ratio to allow quantitative analysis. While 785-nm excitation remains the most universal wavelength for petrochemical and pharmaceutical Raman applications, some applications such as early stage "dirty" crystallization, biofuels, polyurethanes, heavy hydrocarbons, and some colorants/pigments exhibit fluorescence too intense to allow the application to be addressed with 785-nm excitation. For these applications, the analyzer provides an effective route for in situ monitoring. To optimize performance in this wavelength range, it was necessary to incorporate developments such as diode lasers, InGaAs array detectors, and refractive axial transmissive spectrographs. It was also necessary to incorporate reaction analysis software in order to obtain maximize detected Raman signals.
In certain cases a Raman method had to be employed off-line because the only available instrumentation capable of overcoming sample fluorescence was an FT-Raman spectrometer. With the introduction of this analyzer, Raman measurements can be made on-line, allowing users the potential to develop process control methodologies rather than end-product testing.
The analyzer is offered with either iC RamanTM 4.1 for reaction development and understanding, or synTQ-Lite for process monitoring and control where compliance to 21 CFR Part 11 and interface to data historians are required.
Kaiser Optical Systems, Inc.
371 Parkland Plaza
Ann Arbor MI 48103
Phone: 734-665-8083
Fax: 734-665-8199
http://www.kosi.com
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