Infrared fiber imager

• US 6,175,678 B1
• Filed: 05/12/1999
• Issued: 01/16/2001
• Est. Priority Date: 05/12/1999
• Status: Active Grant

• Current Assignee: the united states of america as represented by the secretary of the navy
• Original Assignee: The United States of America As Represented By The Secretary of Agriculture
• Inventors: Aggarwal, Ishwar D., Shaw, Brandon, Sanghera, Jasbinder, Pureza, Paul
• Primary Examiner(s): NGO, HUNG NHAT
• Application Number:
  US09/310,376
• Time in Patent Office: 615 Days
• Field of Search: 385/115, 385/116, 385/120, 385/121, 385/33
• US Class Current: 385/116
• CPC Class Codes: G02B 6/02 Optical fibres with cladding with or without a coating
• CPC Class Codes: G02B 6/06 the relative position of the fibres being the same at both ends, e.g. for transporting images

Abstract

An apparatus for performing spatial and spectral analysis comprising a bundle of a plurality of chalcogenide glass fiber, an optical system for transmitting light received from the bundle, and a detector for receiving the light signal from the optical system for providing spatial and spectral analysis of the bundle image; maximum diameter of the fibers is about the size of the pixels on the detector.

Claims

1. An apparatus comprising a bundle of a plurality of chalcogenide glass fibers arranged in a geometrical configuration, a detector comprising a plurality of pixels and an optical system between said bundle and said detector for transmitting light from said bundle to said detector, maximum size of said fibers is about the same as that of the pixels.

2. The apparatus of claim 1 wherein said fibers have a cladding thereon and said bundle transmits light in the wavelength region of about 2-12 microns and wherein said fiber bundle is coherent.

3. The apparatus of claim 2 wherein said pixels are arranged in a square geometrical pack and said detector is capable of providing spatial and spectral analysis of the signal from the bundle image.

4. The apparatus of claim 3 wherein said fibers are coupled to said pixels in an arrangement selected from the group consisting of one fiber to one pixel, multiple fibers to one pixel, and mixtures thereof;

and said fibers in said bundle are disposed in a geometrical pack selected from the group consisting of square pack, hexagonal pack, and mixtures thereof.

5. The apparatus of claim 3 wherein diameter of said fibers is about 5-33 microns and said fibers in said bundle are disposed in a geometrical pack selected form the group consisting of square pack, hexagonal pack, and mixtures thereof.

6. The apparatus of claim 3 wherein diameter of said fibers in said bundle are disposed in a square geometrical shape and are about the same size as said pixels, assuming pixels on said detector are about 30×

30 microns with a gap of about 3 microns between the pixels.

7. The apparatus of claim 4 including means for transmitting light of a designed narrow band.

8. The apparatus of claim 7 wherein said detector is a focal plane array.

9. The apparatus of claim 8 wherein said optical system includes a lens said lens, is a collimating lens which receives light from said bundle, the apparatus further including a bandpass filter for receiving light from said collimating lens and a focusing lens for receiving light from said bandpass filter and transmitting light from said bandpass filter to said focal plane array.

10. The apparatus of claim 9 including a sheath around said bundle.

11. An apparatus comprising a bundle of a plurality of chalcogenide glass fibers, a detector comprising a plurality of pixels, a collimating lens for receiving light from said bundle, a bandpass filter for receiving light from said collimating lens, a focusing lens for receiving light from said bandpass filter, and a detector for receiving light form said focusing lens;

said pixels are about 30×

30 microns with a gap of about 3 microns arranged in a square geometrical pack and maximum size of said fibers is about the same as that of a pixel.

12. The apparatus of claim 11 wherein said fibers have a cladding thereon, said bundle transmits light in the wavelength region of about 2-12 microns and wherein said fiber bundle is coherent.

13. The apparatus of claim 12 wherein said detector provides spatial and spectral analysis of light signal from said bundle image and said fibers have cladding thereon selected from the group consistent of glass, plastic and mixtures thereof.

14. The apparatus of claim 12 wherein said fibers are coupled to said pixels in an arrangement selected from the group consisting of one fiber to one pixel, multiple fibers to one pixel, and mixtures thereof;

and said fibers in said bundle are disposed in a geometrical pack selected from the group consisting of square pack, hexagonal pack, and mixtures thereof.

16. The apparatus of claim 13 wherein outside diameter of said fibers is 5-33 microns, said fibers are coupled to said pixels in an arrangement of multiple fibers to one pixel, said fibers in said bundle are in a hexagonal pack, said pixels are about 30 microns×

30 microns with a gap of about 3 microns between the pixels, and said pixels are in a square pack arrangement.

18. The apparatus of claim 14 including means for transmitting light of a narrow band and wherein said detector is a focal plane array.

15. The apparatus of 13 wherein diameter of said fibers is about 1-33 microns and said fibers in said bundle are disposed in a geometrical pack selected from the. group consisting of square pack, hexagonal pack, and mixtures thereof.

17. The apparatus of 13 wherein diameter of said fibers in said bundle are disposed in a square geometrical shape, assuming pixels on said detector are about 30 microns×

30 microns with a gap of about 3 microns between the pixels.

19. The apparatus of 18 including multiple bundles coupled to one detector.

20. The apparatus of claim 19 wherein said bandpass filter is a wheel having a plurality of said bandpass filters mounted thereon, each filter passing light of selected wavelength region.