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Raman spectrometer having interferometer with optical substraction filters

  • US 5,247,343 A
  • Filed: 11/01/1991
  • Issued: 09/21/1993
  • Est. Priority Date: 11/01/1991
  • Status: Expired due to Term
First Claim
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1. Apparatus for Raman spectrometry comprising:

  • (a) a source of a beam of electromagnetic radiation at a selected wavelength suitable for Raman spectrometry and means for directing the beam from the source onto a sample;

    (b) sample collection optics means for collecting the radiation reflected from the sample into a beam;

    (c) an interferometer mounted to receive the beam from the sample collection optics means as its input beam and to provide a modulated output beam;

    (d) a detector capable of detecting the wavelengths of the radiation reflected from the sample, and optics means for focusing the output beam from the interferometer onto the detector;

    (e) a first filter interposed in the input beam to the interferometer at a position adjacent to the interferometer and a second filter interposed in the output beam from the interferometer at a position adjacent to the interferometer, the filters constructed to provide substantial attenuation of the wavelength of the Rayleigh line reflected from the sample while substantially passing the Raman lines reflected from the sample, the two filters arranged to provide optical subtraction in the interferometer of wavelengths at the Rayleigh line.

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