Spectroscopic apparatus and methods
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United States of America Patent
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Nov 18, 1997
Grant Date -
N/A
app pub date -
May 10, 1995
filing date -
Dec 22, 1988
priority date (Note) -
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Abstract
A sample placed under a microscope is illuminated by light from a laser beam. Raman scattered light is passed back via a dichroic filter to various optical components which analyse the Raman spectrum, and thence to a CCD detector. The optical components for analysing the Raman spectrum include tunable dielectric filters in a filter wheel; a Fabry-Perot etalon; and a diffraction grating. These various components may be swapped into the optical path as desired, for example using movable mirrors, enabling the apparatus to be used very flexibly for a variety of different analysis procedures. Various novel analysis methods are also described.
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