IMAGING SYSTEM AND METHOD USING MULTICORE FIBER

• US 20130278740A1
• Filed: 01/05/2012
• Published: 10/24/2013
• Est. Priority Date: 01/05/2011
• Status: Abandoned Application

• Current Assignee: BAR ILAN University
• Original Assignee: BAR ILAN University
• Inventors: Zalevsky, Zeev, Shahmoon, Asaf, Slovin, Hamutal
• Application Number:
  US13/978,423
• Publication Number:
  US 20130278740A1
• Time in Patent Office: Days
• US Class Current: 348/76
• CPC Class Codes: A61B 1/000094 extracting biological structures
• CPC Class Codes: A61B 1/00096 Optical elements
• CPC Class Codes: A61B 1/00167 Details of optical fibre bundles, e.g. shape or fibre distribution
• CPC Class Codes: A61B 1/00172 with means for scanning
• CPC Class Codes: A61B 1/00188 with focusing or zooming features
• CPC Class Codes: A61B 1/042 characterised by a proximal camera, e.g. a CCD camera
• CPC Class Codes: A61B 1/07 using light-conductive means, e.g. optical fibres

Abstract

The present invention provides a system for imaging an object comprising: an optical imaging unit for imaging an object on a detection array, the optical imaging unit defining an optical axis and comprising a multicore fiber configured to collect light from the object at an input edge of the multicore fiber and transfer collected light to an output edge of the multicore fiber; a displacing unit configured to shift the input edge of the multicore fiber relatively to the object in a plane substantially perpendicular to the optical axis to obtain a set of shifted images of the object; and an operating unit configured to operate the displacing unit by setting a shifting amplitude to either a first amplitude inferior or equal to the diameter of a core of the multicore fiber or a second amplitude superior or equal to the diameter of the multicore fiber.

Claims

1. A system for imaging an object comprising:

an optical imaging unit for imaging an object on a detection array, the optical imaging unit defining an optical axis and comprising a multicore fiber configured to collect light from the object at an input edge of the multicore fiber and transfer collected light to an output edge of the multicore fiber;

a displacing unit configured to shift the input edge of the multicore fiber relatively to the object in a plane substantially perpendicular to the optical axis to obtain a set of shifted images of the object; and

an operating unit configured to operate the displacing unit by setting a shifting amplitude to either a first amplitude inferior or equal to the diameter of a core of the multicore fiber or a second amplitude superior or equal to the diameter of the multicore fiber.

2. The system according to claim 1, wherein the optical imaging unit comprises an optical assembly configured to collect light from the output edge of the multicore fiber and form an image of the object on the detection array.

3. The system according to claim 1, wherein the optical imaging unit is configured for selectively operating in either one of a near field and far field imaging modes.

4. The system according to claim 3, wherein the optical imaging unit comprises a lens unit arranged upstream of the input edge of the multicore fiber with respect to a direction of light propagation through the system, said lens unit being displaceable along the optical axis with respect to the object.

5. The system according to claim 1, comprising a processing unit connectable to the detection array and configured to receive and process data indicative of the set of shifted images for obtaining a combined image of the object by interlacing one or more of said shifted images, said combined image having the improved resolution and/or field of view.

6. The system according to claim 3, further comprising a detection unit configured to monitor a distance between the object and the input edge of the multicore fiber to thereby enable the operation of the optical imaging unit in either one of the near field and far field imaging modes.

7. The system according to claim 1, further comprising a display unit for displaying at least one of the images.

8. The system according to claim 1, wherein the operating unit comprises an input utility configured to receive input from a user defining whether the field of view or resolution of the imaging is to be improved.

9. The system according to claim 1, wherein the operating unit further comprises:

a communication utility to communicate with the detection unit; and

a shift controller for setting the shifting amplitude based on a distance between the object and the input edge of the multicore fiber and on whether a field of view or a resolution of the original image is to be improved.

10. The system of claim 9, wherein the operating unit comprises a communication utility to communicate with the input unit.

11. The system according to claim 1, wherein the multicore fiber is either a fiber bundle or a photonic crystal.

12. The system according to claim 1, wherein the multicore fiber has a polygonal cross section defining two opposite substantially parallel facets.

13. The system according to claim 12, wherein the cross section of the multicore fiber is rectangular.

14. The system according to claim 12, further comprising electrodes located on said opposite facets of the multicore fiber to carry out at least one of electrical stimulation and sensing temperature using Peltier effect.

15. The system according to claim 1, further comprising:

a coherent light source configured to illuminate the object and provide a reference wave front; and

an holographic or interferometric setup configured to provide interference between the reference wave front and a reflected wave front reflected by the object and transferred by the multicore fiber, thereby providing phase information on light reflected by the object.

19. The system according to claim 13, further comprising electrodes located on said opposite facets of the multicore fiber to carry out at least one of electrical stimulation and sensing temperature using Peltier effect.

16. A method for imaging an object comprising:

transferring light coming from the object through a multicore fiber having an input edge and an output edge;

imaging the object on a detection array by collecting light from the output edge of the multicore fiber;

setting a shifting amplitude for multicore fiber, such that the shifting amplitude is either a first amplitude inferior or equal to the diameter of a core of the multicore fiber or a second amplitude superior or equal to the diameter of the multicore fiber, to enable improvement of either resolution or the field of view of imaging;

shifting the input edge of the multicore fiber in a plane substantially perpendicular to an axis of light propagation from the object to the detection array, using said shifting amplitude, thereby obtaining a set of shifted images of the object; and

processing said set of shifted images in order to obtain a combined image of the object by interlacing said shifted images for improving the resolution or field of view.

17. The method according to claim 16, comprising selectively imaging the object in either one of a near field and far field imaging modes.

18. The method according to claim 17, comprising moving a lens unit, in front of the input edge of the multicore fiber, along said axis of light propagation, with respect to the object.