On-line quantitative analysis of chemical compositions by Raman

Details On-line quantitative analysis of chemical compositions by Raman On-line quantitative analysis of chemical compositions by Raman

1996-08-26

1997-07-29

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With raman type light scattering

G01J 344, G01N 2165

Patent

active

056526539

ABSTRACT:
A method for quantitatively monitoring in situ by Raman spectrometry one or more selected constituents of a chemical composition comprises: simultaneously irradiating with a substantially monochromatic radiation source a reference material and a chemical composition containing one or more constituents, the radiation being transmitted from the source to the chemical composition by an excitation conduit connecting the source to an optical probe that interfaces with the composition; simultaneously acquiring at more than one wavelength convolved Raman spectra of the reference material and the chemical composition by means of a spectrograph, which is connected to the optical probe by a collection conduit; choosing the standard Raman spectrum of the reference material; determining the convolution function of the convolved spectra from the convolved Raman spectrum and the standard Raman spectrum of the reference material; applying the convolution function to adjust the convolved Raman spectrum of the composition to produce the standard Raman spectrum of the chemical composition; and applying predetermined calibration means to the standard Raman spectrum of the chemical composition, by which the chemical constitution of the composition at the time of acquisition of the convolved Raman spectra can be ascertained.

REFERENCES:
patent: 3033822 (1962-05-01), Kibler et al.
patent: 3556659 (1971-01-01), Hawes
patent: 3772405 (1973-11-01), Hamb
patent: 4259478 (1981-03-01), Jackson, Jr. et al.
patent: 4573761 (1986-03-01), McLachlan et al.
patent: 4620284 (1986-10-01), Schnell et al.
patent: 5112127 (1992-05-01), Carrabba et al.
patent: 5455673 (1995-10-01), Alsmeyer et al.
Odian, Principles of Polymerization, 3rd ed., Wiley, New York, 1991, pp. 97-100.
Billmeyer, Textbook of Polymer Science, 3rd ed., Wiley, New York, 1984, pp. 442-445.
Wang and McCreery, Anal. Chem., 1990, vol. 62, pp. 2647-2651.
Chase, J. Am. Chem. Soc., 1986, vol. 108, pp. 7485-7488.
Carrabba et al., "Compact Raman Instrumentation for Process adn Environmental Monitoring," SPIE, 1991, vol. 1434, pp. 127-134.
Carrabba et al., Appl. Spec., 1990, vol. 44, pp. 1558-1561.
Vess and Angel, "Near-Visible Raman Instrumentation for Remote Multi-Point Process Monitoring Using Optical Fibers and Optical Multiplexing," SPIE, 1992, vol. 1637, pp. 118-125.
Angel et al., "Simultaneous Multi-Point Fiber-Optic Raman Sampling for Chemical Process Control Using Diode Lasers and a CCD Detector," SPIE, 1991, vol. 1587, pp. 219-231.
Newman et al., Appl. Spec., 1992, vol. 46, pp. 262-265.
Seasholtz et al., Appl. Spec., 1989, vol. 43, pp. 1067-1972.
Allred and McCreery, Appl. Spec., 1990, vol. 44, pp. 1229-1231.
Schwab and McCreery, Anal. Chem., 1984, vol. 56, pp. 2199-2204.
Schoen et al., Appl. Opt., 1992, vol. 36, pp. 7707-7715.
Schoen et al., SPIE, 1993, vol. 1857, pp. 116-125.
Garrison, SPIE, 1992, vol. 1681, pp. 291-293.
Bulkin et al., Macromolecules, 1987, vol. 20, pp. 830-835.
Bower et al., Polymer, 1982, vol. 23, pp. 645-649.
Adar et al., Polymer, 1985, vol. 26, pp. 1935-1943.
DeBlase et al., J. Polym. Sci., 1985, vol. 23, pp. 109-115.
Grasselli and Bulkin, eds., "Analytical Raman Spectrometry," vol. 14, Chem. Anal., 1991, Wiley, New York, pp. 223-252.
W. H. Press et al., Numerical Recipes: The Art of Scientific Computing, 1986, Cambridge University Press, pp. 77-89, pp. 407-412.
Savitsky et al., Anal. Chem., 1964, vol. 36, pp. 1627-1639.
Takeuchi et al., Appl. Spec., 1993, vol. 47, pp. 129-131.
Martens et al., Multivariate Calibration, 1989, Wiley, New York, pp. 1-6, 11-22, 25-30, 73-78, 116-125.

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