Combined complementary filtering spectrum analysis device, in particular for RAMAN spectrometry
First Claim
1. An improved spectrum analysis device which includesa source which can generate excitation radiation of a predetermined wavelength;
- means for guiding the excitation radiation onto a sample placed in the location;
a separator filter which can reflect, in a first direction, a first spectral band of the radiation it receives and which transmits, in a second direction, the remainder of the radiation which it receives, the first spectral band being centered on the wavelength of the excitation radiation and the remainder of the radiation transmitted by the separator filter corresponding to a desired RAMAN spectrum;
means for collecting the radiation coming from the sample excited in this way, and guiding it onto the separator filter;
spectral detection and analysis means disposed in the second direction; and
means for collecting the RAMAN spectrum transmitted by the separator filter, and guiding it onto the detection and analysis means,wherein the improvement comprises;
a band-eliminating filter with a steep band eliminating slope, which filter can reject a second spectral band which is narrower than the first spectral band, and embracing the wavelength of the excitation radiation;
means for collecting the first spectral band of the radiation reflected by the separator filter and guiding it onto the band-eliminating filter in order to eliminate therefrom the second spectral band; and
means for collecting the signal corresponding to the first spectral band from which the second narrow band has been eliminated in this way by the band-eliminating filter and guiding the signal onto optical means which combine it in the second direction with the RAMAN spectrum transmitted by the separator filter, so that the detection and analysis means process the complementary radiations combined in this way.
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Accused Products
Abstract
A sample which is exposed to excitation radiation scatters light to a separator filter. The scattered light includes a Raman spectrum. The separator filter reflects, a spectral band of the radiation which it receives and transmits, the remainder of the radiation which it receives. The reflected spectral band is centered on the excitation radiation. The spectral band is collected and guided to a band-eliminating filter in order to eliminate therefrom a spectral band which is narrower than the reflected spectral band, and which embraces the wavelength of the excitation radiation. The band-eliminating filter has a steep elimination slope. A signal corresponding to the reflected spectral band, from which the narrow band has been eliminated in this way, is combined with the radiation transmitted by the separator filter and the combined radiations are supplied to a detection and analysis unit.
20 Citations
24 Claims
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1. An improved spectrum analysis device which includes
a source which can generate excitation radiation of a predetermined wavelength; -
means for guiding the excitation radiation onto a sample placed in the location; a separator filter which can reflect, in a first direction, a first spectral band of the radiation it receives and which transmits, in a second direction, the remainder of the radiation which it receives, the first spectral band being centered on the wavelength of the excitation radiation and the remainder of the radiation transmitted by the separator filter corresponding to a desired RAMAN spectrum; means for collecting the radiation coming from the sample excited in this way, and guiding it onto the separator filter; spectral detection and analysis means disposed in the second direction; and means for collecting the RAMAN spectrum transmitted by the separator filter, and guiding it onto the detection and analysis means, wherein the improvement comprises; a band-eliminating filter with a steep band eliminating slope, which filter can reject a second spectral band which is narrower than the first spectral band, and embracing the wavelength of the excitation radiation; means for collecting the first spectral band of the radiation reflected by the separator filter and guiding it onto the band-eliminating filter in order to eliminate therefrom the second spectral band; and means for collecting the signal corresponding to the first spectral band from which the second narrow band has been eliminated in this way by the band-eliminating filter and guiding the signal onto optical means which combine it in the second direction with the RAMAN spectrum transmitted by the separator filter, so that the detection and analysis means process the complementary radiations combined in this way. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification