Coded aperture compton telescope imaging sensor

• US 7,541,592 B2
• Filed: 09/20/2007
• Issued: 06/02/2009
• Est. Priority Date: 07/07/2007
• Status: Expired due to Fees

• Current Assignee: Northrop Grumman Systems Corporation (Northrop Grumman Corporation)
• Original Assignee: Northrop Grumman Systems Corporation (Northrop Grumman Corporation)
• Inventors: Gottesman, Stephen R.
• Primary Examiner(s): Porta; David P.
• Assistant Examiner(s): BOOSALIS, FANI POLYZOS
• Application Number:
  US11/858,312
• Publication Number:
  US 20090008565A1
• Time in Patent Office: 621 Days
• Field of Search: 250/370.09, 250/370.08, 250/363.03, 250/363.06, 250/363.1, 250/394, 250/370.06, 378/2
• US Class Current: 250/370.06
• CPC Class Codes: G01T 1/00 Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation G01T3/00, G01T5/00 take precedence
• CPC Class Codes: G01T 1/295 using coded aperture devices, e.g. Fresnel zone plates handling of radiation of particles, e.g. using diaphragms, collimators, diffraction G21K1/00

Abstract

A combined format gamma-ray detector (D) for measuring impinging gamma-rays (10) includes an active upper level coded aperture detector plane member (12) that is suitable for detecting an impinging gamma-ray (10). An active lower level gamma ray detector plane member (14) that is spaced apart from the upper level coded aperture (12) detects an impinging gamma-ray (10). At low gamma-ray energies, the combined format gamma-ray detector device (D) operates as a conventional coded aperture system and at higher gamma-ray energies, the combined format gamma-ray detector device operates as a Compton scattering detector device.

Claims

1. A combined format gamma-ray detector for measuring impinging gamma-rays comprising:

an active upper level coded aperture detector member suitable for detecting an impinging gamma-ray; and

,

an active lower level gamma ray detector plane member spaced apart from the upper level coded aperture for detecting an impinging gamma-ray;

whereby at low gamma-ray energies, the combined format gamma-ray detector device operates as a conventional coded aperture system and at higher gamma-ray energies, the combined format gamma-ray detector device operates as a Compton scattering detector device.

2. The invention of claim 1 wherein the active upper level coded aperture detector member comprises a solid state detector.

3. The invention of claim 1 wherein the active lower level gamma ray detector plane member consists of material capable of detecting the energy of interacting gamma rays.

4. The invention of claim 1 wherein the active lower level gamma ray detector plane member detects an interaction point of an impinging gamma ray.

5. The invention of claim 1 wherein the active lower level gamma ray detector plane member detects an amount of energy deposited by an impinging gamma ray.

6. The invention of claim 1 wherein the active lower level gamma ray detector plane member is arranged within the gamma ray detector such that the active upper level coded aperture detector member is ahead of the active lower level gamma ray detector plane member relative to a path of travel for the gamma ray.

7. A method for detecting gamma-rays impinging upon a gamma-ray detector comprising the steps of:

detecting lower energy gamma-rays utilizing the gamma-ray detector device in a coded aperture imaging device mode; and

,

detecting higher energy gamma-rays utilizing the gamma-ray detector device in a Compton scattering device mode;

an active upper level coded aperture detector member suitable for detecting an impinging gamma-ray; and

,

an active lower level gamma ray detector plane member spaced apart from the upper level coded aperture for detecting an impinging gamma-ray;

whereby the gamma-ray detector device includes an active upper level coded aperture detector member suitable for detecting an impinging gamma-ray; and

, an active lower level gamma ray detector plane member spaced apart from the upper level coded aperture for detecting an impinging gamma-ray.

8. The method of claim 7 wherein the active upper level coded aperture detector member comprises a solid state detector.

9. The method of claim 7 wherein the active lower level gamma ray detector plane member consists of material capable of detecting the energy of interacting gamma rays.

10. The method of claim 7 wherein the active lower level gamma ray detector plane member detects an interaction point of an impinging gamma ray.

11. The method of claim 7 wherein the active lower level gamma ray detector plane member detects an amount of energy deposited by an impinging gamma ray.

12. The method of claim 7 wherein the active lower level gamma ray detector plane member is arranged within the gamma ray detector such that the active upper level coded aperture detector member is ahead of the active lower level gamma ray detector plane member relative to a path of travel for the gamma ray.