Multichannel FTIR spectroscopy

There have been a number of important developments in light-based detection for CE since the previous edition of this work was published. For example, multichannel detection has become more common for absorbance as well as fluorescence, and Fourier transform infrared (FTIR) and nuclear magnetic resonance spectroscopies are now viable detection modes. Thus, while the purpose of this chapter is to describe the instrumentation and performance of more common optical detectors, newer methods are presented throughout. 

There are a number of approaches to allow infrared microspectroscopic investigations of polymers. While interferometer based approaches dominate the instrumentation in general, other approaches may be effective in specihc cases or when dedicated instrumentation examining a limited range of problems is desired. FPAs, employed to achieve spatial discrimination as in FTIR imaging or spatial and spectral discrimination as in dispersive and hlter approaches, provide flexibility and faster spectroscopy due to their multichannel detection advantage. Many new approaches to microspectroscopy are dedicated to achieving spatial resolution better... 

IR and Raman spectroscopies are both tools that may be useful for monitoring polymerisation rates and cure mechanisms, particularly sequential time-lapse measurements of functional group concentrations at predefined intervals when utilising multichannel Raman or rapid-scan FTIR or FT-Raman detection. 

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