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Raman spectroscopy is based on a physical effect caused by inelastic scattering. For a portion of the scattered light, the photons energy is changed resulting in a wavelength shift. This wavelength shift is characteristic for the molecule and this effect underscores the strong selectivity; both qualitative and quantitative analysis can be carried out.
Over the past years, Raman spectroscopy was mostly used for the analysis in laboratory and only a small number of applications in process analytic control.
Compared to the widely used NIR spectroscopy it has major advantages as the selectivity is higher and more complex mixtures can be analysed. In addition, water does not influence the spectrum strongly. The high availability of fiber-optic components based on fused silica allows a distributed installation online - with a single instrument having multiple measurement points.
Non-Invasive Raman Reaction-Monitoring in Microchannels
In-line Raman spectroscopy is an efficient tool for investigating kinetics of chemical reactions or for monitoring analyte concentrations nearly in real time. Compared to off-line product analysis like HPLC or GC, no quenching or further sample preparation is required.
Both posters describe the use of a MultiSpec® Raman system for kinetic studies.
Efficient Kinetic Measurements in Microreactors by in-line Raman Spectrometer
Monitoring of Kinetics in microreactors can be carried out by in-line Raman spectroscopy. Hereby, an efficient analysis of rapid and exothermal reactions can be achieved. Furthermore, a much faster and cost efficient analysis, avoiding additional steps such as quenching, probe preparation and off-line analyses can be reached.
Process Raman Spectroscopy for the in-line Monitoring of aerob Fermentation
Automated control of processes for the chemical and biotechnological industry requires measurement technologies, which directly [in-line or on-line] determine the reactands and products concentration. Furthermore, a direct and easy integration in the process plant is required. This poster describes the monitoring of a fermentation with an in-line Raman spectrometer.
Process Capable Raman Spectroscopy with High Optical Efficiency for in-line Analytics
Established off-line methods for industrial monitoring of chemical reactions is increasingly replaced by optical online methods. A research project at University of Applied Sciences Mannheim developed a high efficient Raman setup based on 532nm laser excitation and tec5 operation electronics for S7031-1006S.