US 11,788,967 B2
Apparatus for carrying out Raman spectroscopy
Oleksii Ilchenko, Lyngby (DK); Tomas Rindzevicius, Malmo (SE); Anja Boisen, Birkerod (DK); and Roman Slipets, Holte (DK)
Assigned to DANMARKS TEKNISKE UNIVERSITET, Kgs. Lyngby (DK)
Appl. No. 16/963,679
Filed by DANMARKS TEKNISKE UNIVERSITET, Kgs. Lyngby (DK)
PCT Filed Jan. 23, 2019, PCT No. PCT/DK2019/050027
§ 371(c)(1), (2) Date Jul. 21, 2020,
PCT Pub. No. WO2019/145005, PCT Pub. Date Aug. 1, 2019.
Claims priority of application No. PA201870044 (DK), filed on Jan. 23, 2018; application No. PCT/DK2018/050306 (WO), filed on Nov. 20, 2018; application No. PA201870804 (DK), filed on Dec. 10, 2018; and application No. PA201870852 (DK), filed on Dec. 21, 2018.
Prior Publication US 2021/0072158 A1, Mar. 11, 2021
Int. Cl. G01J 3/02 (2006.01); G01J 3/44 (2006.01); G01N 21/65 (2006.01)
CPC G01N 21/65 (2013.01) [G01J 3/0229 (2013.01); G01J 3/0297 (2013.01); G01J 3/44 (2013.01); G01N 2201/0612 (2013.01); G01N 2201/0631 (2013.01); G01N 2201/0633 (2013.01); G01N 2201/0635 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An apparatus for carrying out Raman spectroscopy on a sample, the apparatus comprising:
a light source for providing a beam of excitation radiation; and
an optical system that provides a first beam of excitation radiation and a second beam of excitation radiation, wherein the first beam of excitation radiation and the second beam of excitation radiation travel along different directions, and wherein the optical system provides an optical light path for directing the first beam of excitation radiation to a sample and for directing a first beam of scattered light from the sample to a detector and for directing the second beam of excitation radiation to a reference sample and for directing a second beam of scattered light from the reference sample to the detector, wherein the first beam of scattered light and the second beam of scattered light travel along at different directions, the optical system comprising:
a spectrograph comprising:
a grating adapted to divide the first beam of scattered light from the sample into a spectrum of spatially separated wavelength components and to direct a portion of the spectrum from the sample to the detector; and
a first lens system in a first light path between the grating and the detector for focussing the portion of the spectrum from the sample onto a first area of the detector, wherein the grating is further adapted to divide the second beam of scattered light from the reference sample into a reference spectrum of spatially separated wavelength components and to direct a portion of the reference spectrum from the reference sample to the detector, wherein the first lens system is adapted to focus the portion of the spectrum from the sample onto a second area of the detector, wherein the second area is different from the first area;
wherein the optical system comprises a second lens system in a second light path between the light source and the sample, wherein the second lens system focusses the second beam of excitation radiation to a first focal point in a focal plane wherein the reference sample is placed and the second lens system focusses the first beam of excitation radiation to a second focal point in the focal plane, wherein the first beam of excitation radiation focused at the second focal point avoids the reference sample;
wherein the optical system comprises a beam splitter configured to be reflective for the first beam of excitation radiation and light-transmissive for at least a portion of the first beam of scattered light, wherein the beam splitter comprises a surface and the reference sample is arranged on the surface of the beam splitter.