Spectroscopic apparatus and methods.

摘要

A sample (14) placed under a microscope (48) is illuminated by light from a laser beam (10). Raman scattered light is passed back via a dichroic filter (18) to various optical components which analyse the Raman spectrum, and thence to a CCD detector (12). The optical components for analysing the Raman spectrum include tunable dielectric filters in a filter wheel (84); a Fabry-Perot etalon (82); and a diffraction grating (60). These various components may be swapped into the optical path as desired, for example using movable mirrors (74,76), enabling the apparatus to be used very flexibly for a variety of different analysis procedures. Various novel analysis methods are also described. <IMAGE>