Optics: measuring and testing – By dispersed light spectroscopy – With raman type light scattering
Patent
1983-03-30
1986-03-04
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With raman type light scattering
G01J 344, G01N 2165
Patent
active
045737924
ABSTRACT:
A method of and an apparatus for quantitative analysis in accordance with CARS wherein a first system filled with a material to be measured and a second system filled with a reference material of known concentration are disposed in series; first laser light of a first frequency for excitation is applied to these systems together with second laser light having frequency of wide band width; light passed through these two systems, respectively, is applied to a spectrograph provided with, a multi-channel detector; and quantitative analysis for the material to be measured is effected on the basis of a ratio of intensity between the signal outputs generated in respective different channels of the multi-channel detector and corresponding to the material to be measured and to the reference material respectively. Furthermore, anti-Stokes' light emitted between rotational levels of hydrogen is utilized in the case of quantitative analysis of hydrogen.
REFERENCES:
Nibler et al., Optics Communications, vol. 18, No. 3, Aug. 1976, pp. 371-373.
Tolles et al., Applied Spectroscopy, vol. 31, No. 4, Jul.-Aug. 1977, pp. 253-270.
Bridoux et al., Journal of Raman Spectroscopy, vol. 11, No. 6, Dec. 1981, pp. 515-516.
Eckbreth et al., Prog. Energy Combust. Sci., vol. 5, pp. 253-322, (1979).
CARS Concentration Sensitivity With and Without Nonresonant Background Suppression by Eckbreth et al., Final Tech. Report R80-95462811, United Technologies Research Center, (1980).
"CARS Measurements in an Internal Combustion Engine," Applied Optics, vol. 18, No. 22, Nov. 15, 1979.
"Coherent Anti-Stokes Raman Spectroscopy (CARS): Improved Experimental Design and Observation of New Higher-Order Processes," Applied Physics Letters, vol. 28, No. 1, Jan. 1, 1976.
Kajiyama Koichi
Moro Norio
Sajiki Kazuaki
Yamaguchi Tadayoshi
Evans F. L.
Kabushiki Kaisha Komatsu Seisakusho
Meller Michael N.
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