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A robust method for the determination of carbon dioxide in sugar containing solutions using a single distributed feedback quantum cascade laser (QCL) has been developed. By switching the driving current between two selected values, 1.6 and 1 A, emission wavelengths at 2341.4 and 2341.6 cm-1 could be achieved. The method is based on absorbance measurements in transmission and the calculation of the...
Two pulsed Fabry–Pérot quantum cascade lasers (QCL) have been employed for the simultaneous measurement of two analytes in aqueous solutions. Two laser beams (1393 and 1080 cm-1) were combined by an optical system of parabolic mirrors and a ZnSe-beam splitter. Measurements were made in transmission using a 41 μm CaF2-flow cell and a mercury-cadmium-telluride (MCT) detector. Using glucose and sodium...
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