Raman spectrometer having interferometer with optical substracti

Details Raman spectrometer having interferometer with optical substracti Raman spectrometer having interferometer with optical substracti

1991-11-01

1993-09-21

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356301, G01B 902

Patent

active

052473430

ABSTRACT:
A spectrometer for Raman spectrometry has a radiation source which provides a beam of radiation directed onto a sample, sample collection optics which directs the radiation from the sample as an input beam into an interferometer, the output beam of the interferometer being focused onto a detector, and filters interposed in the input and output beams of the interferometer. The filters are preferably holographic notch filters. Optical subtraction occurring in the interferometer as a result of the filters provides enhanced attenuation of the Rayleigh line of the reflected radiation while substantially passing the Raman lines, with the two filters achieving attenuation of the Rayleigh line equivalent to that obtained by several comparable filters stacked together.

REFERENCES:
P. R. Griffiths and J. A. de Haseth, Fourier Transform Infrared Spectrometry, John Wiley and Sons, 1986, pp. 298-311.
D. J. Cutler, "The Development of Fourier Transform Raman Spectroscopy," Spectrochimica Acta, vol. 46A, No. 2, 1990, pp. 123-129.
D. J. Cutler, "Fourier Transform Raman Instrumentation," Spetrochimica Acta, vol. 46A, No. 2, 1990, pp. 131-151.
F. J. Bergin, "A Microscope for Fourier Transform Raman Spectroscopy," Spectrochimica Acta, vol. 46A, No. 2, 1990, pp. 153-159.
C. J. Petty, et al., "Future Advances in Near Infrared Fourier Transform Raman Spectroscopy," Spectrochimica Acta, vol. 46A, No. 2, 1990, pp. 331-337.
Norman Wright, et al., "Fourier Transform Raman Spectrometry," paper published by Bio-Rad Digilab Division. Publication date unknown.
B. Schrader, et al., "NIR-FT-Raman-Spectroscopy, State of the Art," Journal of Molecular Structure, 217, 1990, pp. 207-220.
Advertisement by Physics Optics Corporation entitled "Raman Holographic Edge Filters," publication date unknown.

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