Abstract
An apparatus for carrying out Raman spectroscopy on a sample (5) comprises: a light source (1 ) for providing a beam (15) of excitation radiation, and an optical system (101 ) providing an optical light path for directing the beam (15) of excitation radiation to the sample (5) and for directing a beam (16) of scattered light from the sample (5) to a detector (14), the optical system (101 ) comprising a spectrograph (8), the spectrograph (8) comprising a grating (12), in particular a transmission grating, adapted to divide the beam (16) of scattered light into a spectrum of spatially separated wavelength components (17) and to direct at least a portion of the spectrum to the detector (14), the spectrograph (8) comprising a first lens system (13) in the light path between the grating (12) and the detector (14) for focussing the portion of the spectrum onto the detector (14), the optical system comprising at least a second lens system (103, 147), in particular in the light path between the light source (1 ) and the sample (5), and the second lens system (103, 147) being configured to provide a first focal plane with at least a first focal point (105, 105a, 105b) in the optical path for focussing the beam (15) of excitation radiation and/or the beam (16) of scattered radiation at the first focal point (105, 105a, 105b), and the apparatus comprising a reference sample (107) arranged in the focal plane, in particular at the first focal point (105, 105a, 105b), for obtaining a reference spectrum from the reference sample (107).
| Original language | English |
|---|---|
| IPC | G01N 21/ 65 A I |
| Patent number | WO2019145005 |
| Filing date | 23/01/2018 |
| Country/Territory | International Bureau of the World Intellectual Property Organization (WIPO) |
| Priority date | 21/12/2018 |
| Priority number | DK2018PA70852 |
| Publication status | Published - 1 Aug 2019 |