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At the heart of Remspec's systems are fiber-optic probes that use patented technology to combine bundles of IR-transmitting optical fibers with an ATR crystal for analysis of liquid and semi-liquid samples, or with specialized transmission or reflectance heads for gas, liquid and solid samples. By using bundles of 500-µm fiber, we multiply the optical throughput available from a single fiber while maintaining flexibility in the cables. Using a fiber bundle and carefully matching the properties of the various optical components, we can obtain detection limits of better than 1% (0.1% in many cases) for most conventional solution analysis using the ATR probe. Where a lower detection limit is needed, a specially designed liquid transmission head can often be used with the same probe, taking the detection limit down to sub-millimolar levels.
Enhanced Optical Performance
Just as the use of fiber bundle technology ensures maximum signal-to-noise performance for Remspec's probes, so our patented enhanced technology ensures the most complete spectral coverage. The standard Remspec Mid-IR probe has spectral coverage from 5000 cm-1 to 900 cm -1 (2.0 to 11 microns) but because of a Se-H vibration in the glass there is a region of minimal transmission at about 2200 cm-1 (see red trace in the figure below). This is not a problem for most users, but for specific applications such as metal carbonyl chemistry we offer specialized enhanced probes which combine more than one type of fiber in the same bundle. With our enhanced probes we offer transmission from 5000 cm-1 to 1000 cm-1 with no interruptions (see blue trace).
