Low-Cost Infrared Microspectroscopy
Table 1: Band ratio, relative standard deviation (RSD) sensitiv- ity, and correlation coefficients (R2
Red %
Colorant 1 2 5
10
Band Ratio
% RSD Yellow
Band Ratio
) for each of the fiber sets. Blue
% RSD
Band Ratio
% RSD
0.0412 17.3 0.0289 16.3 0.0439 11.1 0.0716 15.4 0.0574 9.3 0.1015 4.5 0.2263 5.8 0.1874 3.4 0.2937 3.3 0.5082 3.9 0.3860 3.1 0.5824 2.4
Sensitivity 0.053 R2
0.040 0.9967 0.9990 0.060 0.9995
Conclusion In conclusion we have demonstrated the use of a new low-
cost infrared microscope possessing many of the capabilities of high-priced systems. Technological advances in audio-digital technology and digital cameras have improved the perfor- mance of infrared microscopes such that analysis of samples as small as 60 micrometers are now routine.
Acknowledgements Te authors would like to thank Dr. Robert Price, editor of
Microscopy Today, for his helpful comments and edits regard- ing this manuscript.
References [1] HG McDowell, “Evolution of Analytical Instrumentation: Te Perkin Elmer Story”; address to 31st Annual Meeting of the Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy, NJ, 1980.
[2] VJ Coates et al., J Op Soc Am 43 (1953) 984–89. [3] PA Martoglio et al., Anal Chem 62 (1990) 1123A–28A. [4] In 1985 ASTM Committee Symposium on Te Design, Sam- ple Handling, and Applications of Infrared Microscopes, Philadelphia, PA, Sept. 30, 1985.
[5] PR Griffiths, Chemical Infrared Fourier Transform Spectros- copy, John Wiley and Sons, New York, 1975.
[6] RK Lowry, Anal Chem 58 (1986) 23A–34A. [7] R Cournoyer et al., Anal Chem 49 (1977) 2275–77. [8] ME Lacy, “Isolation and Molecular Identification of Ultrami- cro Contaminants by Fourier Transform Infrared Spectros- copy”; address to the 28th
Annual Technical Meeting of the Institute of Environmental Sciences, GA, 1983.
[9] H Humecki, Specimen Preparation for Microinfrared Analy- sis in 1985 ASTM Committee Symposium on Te Design, Sample Handling, and Applications of Infrared Micro- scopes, Philadelphia, PA, Sept 30, 1985.
[10] AJ Sommer, “Mid-Infrared Transmission Microspectroscopy,” in Handbook on Vibrational Spectroscopy, eds. JM Chalmers and PR Griffiths, John Wiley & Sons, Ltd., England, 2001.
[11] G Jeschke, “Signal processing in spectroscopy,” in XXIII. Messtechnisches Symposium des Arbeitskreises der Hoch- schullehrer für Messtechnik e.V. (AHMT), ed. G. Goch, Shaker Verlag, Aachen, 2009.
[12] SP Bouffard et al., Appl Spectrosc 48 (1994) 1387–93. [13] RC Hirt et al., Anal Chem 26 (1954) 1270–73.
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