Image mapping spectrometers

• US 8,654,328 B2
• Filed: 11/04/2009
• Issued: 02/18/2014
• Est. Priority Date: 11/04/2008
• Status: Active Grant

• Current Assignee: Rice University
• Original Assignee: Rice University
• Inventors: Tkaczyk, Tomasz S., Kester, Robert T., Gao, Liang
• Primary Examiner(s): Geisel, Kara E
• Assistant Examiner(s): DECENZO, SHAWN H
• Application Number:
  US13/127,401
• Publication Number:
  US 20110285995A1
• Time in Patent Office: 1,567 Days
• Field of Search: 356/326, 356/328, 359/850, 359/851
• US Class Current: 356/326
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0205 Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
• CPC Class Codes: G01J 3/0208 using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction
• CPC Class Codes: G01J 3/021 using plane or convex mirrors, parallel phase plates, or particular reflectors
• CPC Class Codes: G01J 3/0229 using masks, aperture plates, spatial light modulators or spatial filters, e.g. reflective filters
• CPC Class Codes: G01J 3/2823 Imaging spectrometer
• CPC Class Codes: G01J 3/36 Investigating two or more bands of a spectrum by separate detectors
• CPC Class Codes: G01J 3/4406 Fluorescence spectrometry
• CPC Class Codes: G02B 13/22 Telecentric objectives or lens systems
• CPC Class Codes: G02B 27/0025 for optical correction, e.g. distorsion, aberration
• CPC Class Codes: G02B 27/1066 for enhancing image performance, like resolution, pixel numbers, dual magnifications or dynamic range, by tiling, slicing or overlapping fields of view
• CPC Class Codes: G02B 27/143 using macroscopically faceted or segmented reflective surfaces
• CPC Class Codes: G02B 3/0087 with index gradient

Abstract

Devices and methods for hyperspectral and multispectral imaging are discussed. In particular, Image Mapping Spectrometer systems, methods of use, and methods of manufacture are presented. Generally, an image mapping spectrometer comprises an image mapping field unit, a spectral separation unit, and a selective imager. Image mapping spectrometers may be used in spectral imaging of optical samples. In some embodiments, the image mapping field unit of an image mapping spectrometer may be manufactured with surface shaped diamond tools.

Claims

1. A system, comprising:

an image mapping field unit configured to receive an image and output a plurality of image mapping shapes, wherein the image mapping field unit comprises;

a first optical component configured to redirect a first image mapping shape along a first angle to generate a redirected first image mapping shape;

a second optical component configured to redirect a second image mapping shape along the first angle to generate a redirected second image mapping shape, and

a third optical component configured to redirect a third image mapping shape along a second angle to generate a redirected third image mapping shape,

wherein the first image mapping shape and the second image mapping shape are part of a sub-image of the image,

wherein the sub-image is two-dimensional.

2. The system of claim 1, wherein the system is configured to optically transform at least one selected from a group consisting of the redirected first image mapping shape, the redirected second image mapping shape, and the redirected third image mapping shape.

3. The system of claim 2, wherein optically transforming the at least one selected from the group consisting of the redirected first image mapping shape, the redirected second image mapping shape, and the redirected third image mapping shape comprises:

receiving at least one image mapping shape, wherein the received image mapping shape is one selected from the group consisting of the redirected first image mapping shape, the redirected second image mapping shape, and the redirected third image mapping shape;

spectrally separating the at least one image mapping shape to generate at least one spectrally separated image mapping shape; and

outputting the at least one spectrally separated image mapping shape.

4. The system of claim 3, further comprising:

a selective imager, wherein the selective imager is configured to re-image the at least one spectrally separated image mapping shape onto at least one location on a detector.

5. The system of claim 4, wherein the selective imager comprises a plurality of selective imager optical components and wherein at least one of the plurality of selective imager optical components is dynamic.

6. The system of claim 5, wherein at least one of the plurality of selective imager optical components is configured to receive at least the first and the second image mapping shapes that are each redirected along the first angle.

7. The system of claim 4, wherein the detector comprises a two-dimensional (2D) array of electromagnetic radiation detectors.

8. The system of claim 4, wherein the detector is configured to output the at least one spectrally separated image mapping shape to a digital signal processing unit.

9. The system, of claim 8, wherein the digital signal processing unit is configured to remap the at least one spectrally separated image mapping shape to obtain an optical image and a spatially resolved spectrum.

10. The system of claim 9, wherein the digital signal processing unit is further configured to output the optical image and the spatially resolved spectrum to a display.

11. The system of claim 1, wherein the first optical component is one selected from a group consisting of a refractive component, a reflective component, and a waveguide.

12. The system of claim 1, wherein the first optical component is dynamic.

13. The system of claim 1, wherein the image mapping field unit simultaneously redirects the first image mapping shape, the second image mapping shape, and the third image mapping shape.

14. The system of claim 13, wherein the image mapping field unit simultaneously obtains the first image mapping shape, the second image mapping shape, and the third image mapping shape.

15. The system of claim 1, wherein the image mapping field unit comprises a plurality of mirror facets, wherein the first optical component is a first one of the plurality of mirror facets, the second optical component is a second one of the plurality of mirror facets, and the third optical component is a third one of the plurality of mirror facets.

16. The system of claim 1, wherein the image mapping field unit comprises a plurality of prisms, wherein the first optical component is a first one of the plurality of prisms, the second optical component is a second one of the plurality of prisms, and the third optical component is a third one of the plurality of prisms.

17. The system of claim 1, wherein each of the first optical component, the second optical component and the third optical component has at least one spatial dimension no larger than an incident diffraction limited spot size of the system.

18. A method for sampling an image, comprising:

receiving a first image mapping shape, a second image mapping shape, and a third image mapping shape of the image, wherein the first image mapping shape and the second image mapping shape are part of a sub-image of the image, and wherein the sub-image is two-dimensional;

redirecting the first image mapping shape along a first angle to generate a redirected first image mapping shape;

redirecting a second image mapping shape along the first angle to generate a redirected second image mapping shape;

redirecting a third image mapping shape along a second angle to generate a redirected third image mapping shape;

optically transforming at least one selected from a group consisting of the redirected first image mapping shape, the redirected second image mapping shape, and the redirected third image mapping shape to obtain at least one spectrally separated image mapping shape; and

re-imaging the at least one spectrally separated image mapping shape onto a first location on a detector.

19. The method of claim 18, further comprising:

remapping the at least one spectrally separated image mapping shape to obtain an optical image and a spatially resolved spectrum.

20. The method of claim 19, further comprising:

outputting the optical image and the spatially resolved spectrum to a display.