Showing papers on "Fourier transform infrared spectroscopy published in 1970"

Fourier transform spectroscopy.

Abstract: Fourier Transform spectroscopy is beginning to flourish. However, unlike the almost explosive growth following a discovery in some fields, such as gas chromatography or lasers, the use of scanning interferometer systems to measure spectra has had to pass through a long period of quiescence. The latter was, essentially, enforced through the lack of technology, and it was the emergence of electronics and computer science that made Fourier Transform spectroscopy feasible. Further advances in technology, especially the recent advent of the minicomputer, are now rapidly raising Fourier Transform spectroscopy from obscurity. The success story, then, goes back for three quarters of a century (or even further, if one thinks of Robert Boyle's observation in t663 of what are now termed \"Newton's Rings\" Et~ and Fizeau's use of interference to study the yellow sodium doublet ~2~). In considering this technique of spectroscopy, it is interesting and useful to begin with Michelson's \"visibility curves\"; briefly outlining the basis of Fourier Transform spectroscopy, and then to take a giant step in terms of time and technology.

Derivative Traces in Infrared Fourier Transform Spectroscopy

Abstract: The principles of derivative spectrophotometry have been known for many years, and a variety of instrumentation for producing the first and higher differentials of absorption spectra has been described1–21 However, despite the advantages of the techniques for intensifying minor changes in spectra, the separation of overlapping bands, or for band sharpening, derivative traces have not been used to a significant extent in infrared spectroscopy

Effects of Biodiesel Saturation Degrees on NOx Emission and FTIR Spectroscopy

Abstract: The Fourier Transform Infrared (FTIR) spectroscopic characteristics of biodiesel produced from vegetable oils with different saturation degree was investigated in this study. Unsaturation degree, usually determined by the Iodine Value (IV) indicates the sum of double bonds, triple bonds and/or rings. In this work, biodiesels were produced by canola oil, palm oil and coconut oil that have saturation degree of 7.0 wt%. 45.6 wt% and 81.5 wt%, respectively. Biodiesel blends of B10, B15 and B20 were tested in a direct injection diesel engine and the NOx emissions were measured with a flue gas analyser. The NOx emission was increased in all biodiesel cases, where the NOx emission seems to be proportional with the biodiesel unsaturation degree. The FTIR spectroscopy of each biodiesel was analysed with FTIR spectrometer. Each biodiesel produced different FTIR spectroscopy characteristics and the double bond of C=O was the most abundant in highly unsaturated canola oil methyl ester which suggested that FTIR spectroscopy can be suitable to analyse biodiesel characteristics.