Panoramic field of view acquiring and displaying system

• US 7,221,505 B2
• Filed: 06/14/2005
• Issued: 05/22/2007
• Est. Priority Date: 06/14/2004
• Status: Expired due to Fees

• Current Assignee: Rafael - Armament Development Authority Ltd.
• Original Assignee: Rafael - Armament Development Authority Ltd.
• Inventors: Goral, Avihu
• Primary Examiner(s): Nguyen; Thong Q
• Application Number:
  US11/152,702
• Publication Number:
  US 20060114556A1
• Time in Patent Office: 707 Days
• Field of Search: 359350-361, 359399-420, 359725-732, 348 36- 50, 250/235
• US Class Current: 359/399
• CPC Class Codes: G02B 13/06 Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces

Abstract

A panoramic field of view acquiring system comprises three telescopes, which acquire three separate images, each typically covering a little over one third of the total required scene and a multiplexer, which is used to transmit the three images, one at a time, to an appropriate detector. Standard imaging techniques are then used to coordinate the images to form a complete picture and display them as required.

Claims

1. A panoramic field of view acquiring system comprising:

three telescopes, each of said telescopes having a field of view and acquiring an image that is essentially independent of that of the other two of said telescopes;

an optical multiplexer;

a detector;

optical elements for focusing and steering said acquired images along optical paths within said system such that said acquired images are focused on said detector; and

means for storing, processing, and displaying said images;

wherein, said optical multiplexer comprises two choppers having optically operative portions that are operated synchronously in order to transmit each of said images acquired by said telescopes separately to said detector and said images are processed and combined to provide said panoramic field of view and said panoramic view covers a horizontal field of view of up to 360 degrees.

2. The system according to claim 1, wherein each of the three telescopes has essentially the same field of view.

3. The system according to claim 2, wherein each of the three telescopes has a different field of view of slightly more than 120 degrees and is oriented to a different direction and the panoramic view covers a horizontal field of view of 360 degrees.

4. The system according to claim 2, wherein each of the three telescopes has a different field of view of slightly more than 60 degrees and is oriented to a different direction and the panoramic view covers a horizontal field of view of 180 degrees.

5. The system according to claim 1, wherein the optically operative portions of the choppers are rotating elements that intersect the optical paths, each of said rotating elements comprising:

reflective sections;

transparent sections; and

a central portion, which serves to connect said rotating element to driving means.

6. The system according to claim 5, wherein each of the rotating element is selected from elements having the following shapes:

disc shape;

rectangular blade shape; and

blade shape having any contour other than rectangular.

7. The system according to claim 5, wherein each of the rotating elements comprises one reflective section and one transparent section, one of which sections angularly extends over 120 degrees and one of which sections angularly extends over 240 degrees.

8. The A system according to claim 5, wherein each of the rotating elements comprises two reflective sections and two transparent sections.

9. The system according to claim 5, wherein the rotation of each of the rotating elements is synchronized by mechanical means.

10. The system according to claim 9, wherein the mechanical means comprise two shafts to which the rotating elements are keyed, the two shafts have mechanically coupled, concurrent drives, so that they are driven concurrently with the same rotary speed, and the rotating elements are keyed to the shafts in appropriate, relative angular positions.

11. The method of using the system of claim 1 for acquiring and displaying a panoramic field of view comprising the following steps:

acquiring a first, a second and a third image from each of the three telescopes respectively; and

Using a double-chopper multiplexer to transmit said images periodically, successively, one at a time, to the detector;

wherein, the frequency of the multiplexer is between 30 to 100 Hz.

12. The method of using the system of claim 1 for acquiring and displaying a panoramic field of view comprising the following steps:

acquiring a first, a second and a third image from each of the three telescopes respectively;

transmitting said first and said second images to a first chopper of the optical multiplexer;

alternatively, effecting a first selection between said first and said second images;

transmitting the firstly selected image and said third image to the second chopper of said optical multiplexer;

alternatively effecting a second selection between said firstly selected image and said third image; and

transmitting the secondly selected image to the detector;

transmitting said detected image to the means for storing, processing, and displaying said detected image; and

processing and combining said detected images to provide said panoramic field of view.