Device for examining luggage by means of X-rays

• US 4,139,771 A
• Filed: 01/16/1976
• Issued: 02/13/1979
• Est. Priority Date: 07/18/1975
• Status: Expired due to Term

• Current Assignee: Heimann GmbH
• Original Assignee: Heimann GmbH
• Inventors: Dennhoven, Manfred, Kunze, Claus, Kuehn, Rainhard
• Primary Examiner(s): Dixon, Harold A.
• Application Number:
  US05/649,662
• Time in Patent Office: 1,124 Days
• Field of Search: 250/409, 250/408, 250/460
• US Class Current: 378/57
• CPC Class Codes: G01V 5/22 Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
• CPC Class Codes: H05G 1/38 Exposure time time switches in general H01H43/00 and subgroups
• CPC Class Codes: H05G 1/64 Circuit arrangements for X-ray apparatus incorporating image intensifiers

Abstract

A luggage inspection apparatus utilizing fluoroscopic examination in conjunction with an X-ray generator, with the fluoroscopic picture being received by a TV camera, the video signals of which are supplied to an intermediate store for ultimate supply to a TV monitor, the camera containing an AC line-coupled pulse generator for synchronizing the camera and the X-ray flash generator, which pulse generator is electrically interconnected with a synchronizing unit which, upon the initiating of a starting pulse, thus likewise synchronously triggers the X-ray flash generator with respect to the AC supply line.

Claims

1. In a device for the inspection of objects, particularly luggage by means of X-rays emanating from an X-ray flash generator and passing through the object to be examined, to produce a shadow image on a fluorescent screen, which is received by a TV camera feeding an intermediate store, from which the stored video signals from the TV camera may be supplied to a TV monitor, and in which the X-ray flash generator, TV camera and intermediate store are interconnected by a control unit, the combination of the TV camera containing a pulse generator synchronized with the power supply line alternating current voltage, and the control unit being a synchronizing-unit rigidly coupling the line voltage to the TV camera and the X-ray flash generator, which synchronizing-unit, upon triggering of a start pulse initially prepares the intermediate store and thereafter triggers the X-ray flash synchronously with the supply line alternating current voltage.

2. A device according to claim 1, comprising in further combination, an X-ray detector disposed in the beam path of the X-ray flash generator, which X-ray detector triggers means for switching off the high voltage to the X-ray flash generator in the event the intensity and/or duration of the X-ray flash exceeds a predetermined value.

3. A device according to claim 2, wherein the X-ray detector 27 is a photo-conductive cell provided with a layer of X-ray-sensitive laminescent material, which photo-conductive cell is disposed at the beam outlet opening of the X-ray flash generator.

4. A device according to claim 1, wherein the inspection space is provided with a floor which slopes downwardly toward the fluorescent screen.

5. A device according to claim 4, wherein the slope of said floor coincides approximately with the corresponding beam dispersion angle of the X-radiation emitted by the X-ray flash generator.

6. A device according to claim 1, comprising a housing, shielding surrounding the environment from X-radiation and having an inspection space for receiving the inspection object, and a movable shielding hood for completely enclosing the inspection space during the time the inspection object is being fluoroscoped with X-rays.

7. A device according to claim 6, wherein the inspection space is provided with a floor which slopes downwardly toward the fluorescent screen.

8. A device according to claim 7, wherein the slope of said floor coincides approximately with the corresponding beam dispersion angle of the X-radiation emitted by the X-ray flash generator.

9. A device according to claim 4, wherein the housing is provided with at least one proximity switch, disposed for actuation by the movement of the shielding hood, which proximity switch is arranged to set the control unit into operation only when the shielding hood is in a fully closed position.

10. A device according to claim 9, wherein the inspection space is provided with a floor which slops downwardly toward the fluorescent screen.

11. A device according to claim 10, wherein the slope of said floor coincides approximately with the corresponding beam dispersion angle of the X-radiation emitted by the X-ray flash generator.

12. A device according to claim 4, wherein the housing is provided with a first proximity switch which is actuated by closing motion of the shielding hood to trigger a starting pulse at the moment of complete closure of the hood, and a second proximity switch operative to control the high voltage generator for the X-ray flash generator whereby the X-ray flash generator will be inoperative until immediately prior to the final closure of the shielding hood.

13. A device according to claim 12, wherein the inspection space is provided with a floor which slopes downwardly toward the fluorescent screen.

14. A device acording to claim 13, wherein the slope of said floor coincides approximately with the corresponding beam dispersion angle of the X-radiation emitted by the X-ray flash generator.