Systems and Methods for Spatial Heterodyne Raman Spectroscopy

• US 20130188181A1
• Filed: 10/18/2012
• Published: 07/25/2013
• Est. Priority Date: 10/18/2011
• Status: Abandoned Application

• Current Assignee: Lawrence Livermore National Security LLC (Government of the United States of America), University of South Carolina
• Original Assignee: University of South Carolina
• Inventors: Carter, Jerry Chance, Angel, Stanley Michael, Gomer, Nate
• Application Number:
  US13/654,924
• Publication Number:
  US 20130188181A1
• Time in Patent Office: Days
• US Class Current: 356/301
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing
• CPC Class Codes: G01J 2003/451 Dispersive interferometric spectrometry
• CPC Class Codes: G01J 3/14 using refracting elements, e.g. prisms G01J3/18, G01J3/26 take precedence prisms per se G02B5/04
• CPC Class Codes: G01J 3/44 Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry
• CPC Class Codes: G01J 3/45 Interferometric spectrometry
• CPC Class Codes: G01J 3/4531 Devices without moving parts
• CPC Class Codes: G01N 21/65 Raman scattering
• CPC Class Codes: G01N 2201/06113 Coherent sources; lasers
• CPC Class Codes: G01N 2201/062 LED's
• CPC Class Codes: G01N 2201/068 Optics, miscellaneous
• CPC Class Codes: G01N 2201/08 Optical fibres; light guides

Abstract

The present subject matter is directed to a device for spectroscopy. The device includes an excitation source configured to illuminate a sample with wavelengths. The device also includes a spatial heterodyne interferometer configured to receive Raman wavelengths from the sample.

Claims

1. A device comprising:

an excitation source configured to illuminate a sample with wavelengths; and

a spatial heterodyne interferometer configured to receive Raman wavelengths from the sample.

2. The device of claim 1, wherein the excitation source is a light emitting diode, laser source, coherent source, incoherent source, or combinations thereof.

3. The device of claim 2, further comprising a focus element configured to disperse the wavelengths on the sample.

4. The device of claim 1, further comprising one or more band pass filters, the one or more band pass filters being configured to remove light outside of the Raman wavelengths.

5. The device of claim 1, further comprising one or more blocking filters.

6. The device of claim 1, further comprising a charge coupled device or intensified charge coupled device configured to collect Raman wavelengths.

7. The device of claim 1, wherein the spatial heterodyne filter further comprises a diffraction grating or dispersive prism, the grating or prism configured to adjust the wavelengths.

8. The device of claim 7, wherein the grating angle is configured to be adjusted.

9. The device of claim 8, wherein the spatial heterodyne interferometer comprise one or more simple wedge prisms to further increase the acceptance angle.

10. A method for spectroscopy comprising:

illuminating a sample with wavelengths from an excitation source; and

utilizing a spatial heterodyne interferometer to receive Raman wavelengths from the sample.

11. The method of claim 10, further comprising one or more band pass filters, the one or more band pass filters removing light outside the Raman wavelengths.

12. The method of claim 10, further comprising one or more detectors, the one or more detectors detecting ambient light, vibrational instabilities, or combinations thereof.

13. The method of claim 10, wherein the spatial heterodyne filter further comprises a diffraction grating or prism, the grating or prism being moved to adjust the wavelengths.

14. The method of claim 10, further comprising utilizing the spatial heterodyne interferometer to perform time-resolved Raman spectroscopy.

15. The method of claim 10, wherein the excitation source is a pulsed laser.

16. The method of claim 10, wherein the excitation source is a modulated excitation source, and wherein the spatial heterodyne interferometer is gated.

17. The method of claim 10, wherein Stokes and anti-Stokes Raman wavelengths are measured simultaneously.

18. The method of claim 10, further comprising determining the sample temperature.

19. The method of claim 10, wherein the sample comprises biomarker, mineral, rock, ice, light sensitive material, or combinations thereof.

20. The method of claim 10, wherein the sample comprises a high explosive.

21. The method of claim 10, wherein the spatial heterodyne interferometer is configured as a microRaman device for point measurements or imaging to produce chemical maps.

22. The method of claim 10, wherein the spatial heterodyne interferometer is configured as an in-situ chemical sensor to obtain chemical information that is capable of being utilized for chemical reaction control or additive manufacturing.

23. The method of claim 10, wherein the spatial heterodyne interferometer is utilized to perform analysis on multiple spectroscopies.