Near field or far field imaging apparatus with improved resolution

• US 4,262,207 A
• Filed: 04/20/1979
• Issued: 04/14/1981
• Est. Priority Date: 04/20/1979
• Status: Expired due to Term

• Current Assignee: Galileo Electro-Optics Corps.
• Original Assignee: Galileo Electro-Optics Corps.
• Inventors: Tosswill, Christopher H.
• Primary Examiner(s): Smith, Alfred E.
• Assistant Examiner(s): Fields, Carolyn E.
• Application Number:
  US06/031,835
• Time in Patent Office: 725 Days
• Field of Search: 250/363 S, 250/366, 250/203 R, 250/505, 356/147
• US Class Current: 250/363.1
• CPC Class Codes: G01T 1/2914 Measurement of spatial distribution of radiation

Abstract

In imaging apparatus comprising a slit collimator, means for imparting to the collimator a basic movement through a succession of different positions relative to a source of radiation, detector means for providing measurements of the radiation passing through the collimator in each of the positions, and means for processing data from the succession of measurements to gain information about the source, that improvement comprising means for superimposing upon the basic movement of the collimator a cyclic lateral movement of the collimator and the detector means transverse both to the direction of radiation transmission through the collimator and to the walls of the collimator defining the slits, and means for making a succession of such measurements during each cycle of the lateral movement.

Claims

1. In imaging apparatus for improved resolution for determining the location of a source of radiation of unknown position comprising a slit collimator, means for imparting to said collimator a basic movement through a succession of different positions relative to said source of radiation, detector means for providing measurements of the radiation passing through the collimator in each of said positions, and means for processing data from said succession of measurements to gain information about said source, that improvement comprising

means for superimposing upon said basic movement of said collimator a cyclic lateral movement of said collimator and said detector means transverse both to the direction of radiation transmission through said collimator and to the walls of said collimator defining said slits, and

means for making a succession of said measurements during each cycle of said lateral movement.

2. Near field imaging apparatus according to claim 1 wherein said lateral movement is perpendicular to said walls.

3. Far field imaging apparatus according to claim 1 wherein said lateral movement is along an arc of a circle centered on an axis parallel to said walls and perpendicular to the direction of transmission through said collimator.

4. The improvement of claim 1 wherein the frequency of said lateral movement is higher than that of said basic movement, and said means for superimposing said lateral movement is operative between successive steps of said basic movement.

5. The improvement of claim 1 wherein the frequency of said basic movement is higher than that of said lateral movement, and said means for superimposing said lateral movement is operative in steps between cycles of said basic movement.

6. The improvement of claim 1 wherein the total excursion of each cycle of said lateral movement is at least the center-to-center distance between adjacent collimator slits.