Security inspection equipment and radiation detection method

Patent metadata

Field	Value
Publication number	US-10823874-B2
Application number	US-201615740814-A
Country	US
Kind code	B2
Filing date	Aug 8, 2016
Priority date	Dec 4, 2015
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

The present disclosure proposes a security inspection equipment and a radiation detection method, and relates to the field of security inspection. The security inspection equipment according to the present disclosure includes: a ray emitter; and a radiation detector comprising a forescatter detector, the forescatter detector and the ray emitter located on opposite sides of an object to be detected; wherein the radiation detector further comprises at least one of the following detectors: a backscatter detector located between the ray emitter and the object to be detected; or a transmission detector wherein the transmission detector and the ray emitter located on opposite sides of an object to be detected. Such a security inspection equipment has a forescatter detector, which can be used in combination with backscatter detector, to reduce detection dead angles.

First claim

The invention claimed is:

1. A security inspection equipment comprising:
a ray emitter which comprises a ray source and a space modulator, wherein:
the ray source locates at a center of the ray emitter; and
the space modulator comprises:
a fixed shielding plate located between the ray source and the backscatter detector, which causes the rays emitted by the ray source to emit in a predetermined direction with a predetermined angle, and
a rotary shield around the ray source and the fixed shielding plate, wherein the rotary shield rotates around the ray source at a predetermined rate, and comprises more than one slot and more than one throughhole; and

a radiation detector comprising a forescatter detector, the forescatter detector and the ray emitter located on opposite sides of an object to be detected; wherein the radiation detector further comprises at least one of the following detectors:
a backscatter detector located between the ray emitter and the object to be detected; or
a transmission detector wherein the transmission detector and the ray emitter located on opposite sides of an object to be detected.

2. The security inspection equipment according to claim 1 , wherein the ray emitter is used for emitting a fan beam of rays and a flying spot beam of rays.

3. The security inspection equipment according to claim 1 , wherein the transmission detector comprises a plurality of detector modules, wherein an angle of placement of each of the detector modules is adapted to a ray incident direction depending on a location of the each detector module in the transmission detector.

4. The security inspection equipment according to claim 3 , wherein the angle of placement of the detector module adapted to a ray incident direction comprises: a detection surface of the detector module is perpendicular to the ray incident direction.

5. The security inspection equipment according to claim 3 , wherein,
the transmission detector comprises a plurality of detector units consisting of a predetermined number of detector modules arranged in parallel;
the angle of placement of each of the detector modules adapted to the ray incident direction depending on a different location of each of the detector modules in the transmission detector comprising: depending on a location of each of the detector units in the transmission detector, a direction of the detection surface of the each detector unit is adapted to the ray incident direction.

6. The security inspection equipment according to claim 3 , wherein the transmission detector is of an arc shape protruding toward an opposite side of the object to be detected or of a flat plate shape.

7. The security inspection equipment according to claim 1 , further comprising a transportation facility for carrying and moving the ray emitter and the radiation detector.

8. The security inspection equipment according to claim 7 , further comprising a cantilever, one end of the cantilever connected to the transmission detector and the forescatter detector, and the other end of the cantilever connected to the transportation facility;
wherein, the transportation facility carries the ray emitter inside and a side surface of the transportation facility is connected to the backscatter detector.

9. The security inspection equipment according to claim 8 , wherein the cantilever comprises a folding mechanism and a rotating mechanism for folding and rotating the cantilever.

10. The security inspection equipment according to claim 9 , further comprising a controller configured to control folding and rotation of the cantilever.

11. The security inspection equipment according to claim 1 , further comprising a processor configured to receive detection signals from the forescatter detector, the backscatter detector, and the transmission detector, and analyze the objects to be detected.

12. A ray detection method comprising:
emitting a fan beam of rays and a flying spot beam of rays to an object to be detected by using a ray emitter which comprises a ray source and a space modulator, wherein:
the ray source locates at a center of the ray emitter; and
the space modulator comprises:
a fixed shielding plate, located between the ray source and the backscatter detector, which causes the rays emitted by the ray source to emit in a predetermined direction with a predetermined angle, and
a rotary shield around the ray source and the fixed shielding, wherein the rotary shield rotates around the ray source at a predetermined rate, and comprises more than one slot and more than one throughhole;

acquiring detection data by a radiation detector comprising:
acquiring fore-scattering data of the object to be detected by a forescatter detector; and
at least one of following two steps: acquiring transmission data of the object to be detected by a transmission detector; or acquiring backscattering data of the object to be detected by a backscatter detector; and
acquiring detection information based on the fore-scattering data, and at least one of the backscattering data or the transmission data.

13. The method according to claim 12 , wherein emitting a fan beam of rays and a flying spot beam of rays to an object to be detected by using a ray emitter comprises:
emitting rays to the object to be detected by using a ray emitter which alternately emits a fan beam of rays and a flying spot beam of rays.

14. The method according to claim 13 , further comprising at least one of the following steps:
displaying a detection image according to the detection information; or
marking a prohibited object in the object to be detected or alarming according to the detection information.

Assignees

• Nuctech Co Ltd

Inventors

• Cui Jin
• Lin Dong
• Hu Bin
• Tan Xianshun
• Wang Hong

Classifications

• G01N23/12

  the material being a flowing fluid or a flowing granular solid · CPC title

• G01V5/0041

  Physics · mapped topic

• G01V5/0025 Primary

  Physics · mapped topic

• G01V5/222 Primary

  measuring scattered radiation · CPC title

• G01V5/224

  Multiple energy techniques using one type of radiation, e.g. X-rays of different energies · CPC title