X-ray optical system for article inspection, with components disposed on parallel axes

• US 4,297,580 A
• Filed: 09/14/1979
• Issued: 10/27/1981
• Est. Priority Date: 12/27/1977
• Status: Expired due to Term

• Current Assignee: Scan-Tech Security LP (Scan-Tech Security)
• Original Assignee: North American Philips Corp. (Koninklijke Philips N.V.)
• Inventors: Haas, David J., Juner, Adolph
• Primary Examiner(s): Anderson, Bruce C.
• Application Number:
  US06/075,467
• Time in Patent Office: 774 Days
• Field of Search: 250/368, 250/367, 250/363, 250/362, 250/361, 250/490, 250/491, 250/492 R, 250/505, 350/288, 350/299, 350/301, 350/304
• US Class Current: 250/368
• CPC Class Codes: G01V 5/20 Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects

Abstract

An X-ray optical system for examining articles, comprising a source of X-rays directed in a generally downward first direction, fluorescent screen means for converting the X-rays to a light image, such screen means being disposed below said X-ray source, means for receiving the article between the X-ray source and the fluorescent screen means such that X-rays passing through the article reach the screen means to generate thereat a light image of the article, a first light reflecting means disposed generally below the fluorescent screen means so as to receive the light image from the fluorescent screen means, such light image being directed generally in the first direction, second light reflecting means disposed opposite and obliquely to the first light reflecting means, so as to receive the light image reflected from the first light reflecting means and to redirect the light image in a generally upward second direction, and means for viewing the light image, such viewing means being disposed above the second light reflecting means.

Claims

1. An X-ray optical system for examining an inanimate article, comprising:

(a) a source of X-rays directed in a generally downward first direction,

(b) a flourescent screen means for converting said X-rays to a light image, said screen means being disposed below said X-ray source,

(c) means for receiving said article between said X-ray source and said fluorescent screen means such that said X-rays passing through said article reach said screen means to generate thereat a light image of said article,

(d) a first light reflecting means disposed below said flourescent screen means for receiving said light image from said fluorescent screen means, said light image being directed in said first direction,

(e) second light reflecting means disposed opposite and obliquely to said first light reflecting means for receiving said light image reflected from said first light reflecting means and for redirecting said light image in a upward second direction, and

(f) means for viewing said redirected light image, said viewing means being disposed above said second light reflecting means, said viewing means including an image intensifier for receiving said light image from said second light reflecting means.

2. An X-ray optical system for examining an article, as in claim 1, wherein said first and second directions are at least substantially parallel.

3. An X-ray optical system for examining an article, as in claim 1, wherein said article receiving means comprises an X-ray impermeable chamber partially defined by a closable opening by which said article is introduced into said chamber.

4. An X-ray optical system for examining an article, as in claim 1, wherein said first and second light reflecting means comprise mirrors.

5. An X-ray optical system for examining an article, as in claim 1, wherein said X-ray source;

fluorescent screen means, first and second light reflecting means, and viewing means are disposed in a generally U-shaped arrangement.

6. An X-ray optical system for examining an article, as in claim 1, wherein said viewing means includes a mirror element.

7. An X-ray optical system for examining an article, as in claim 6, wherein said mirror element is pivotably mounted.

8. An X-ray optical system for examing an article, as in claim 1, wherein said X-ray source, fluorescent screen means, and first light reflecting means are dispersed substantially on a first axis, and said second light reflecting means and viewing means are disposed substantially on a second axis, said first and second axes being substantially parallel and substantially vertical.

9. An X-ray optical system for examining an article, as in claim 1, wherein said viewing means further includes an optical arrangement having a distant focus of at least three feet from an operator'"'"'s eye position.

10. An X-ray optical system for examining an article, as in claim 1, wherein said viewing means further includes an objective lens and an adjustable mirror element which directs the intensified light image of said article into a third direction, said image intensifier, said objective lens and said mirror element being disposed in said second direction.

11. An X-ray optical system for examining an article, as in claim 3, wherein said fluorescent screen means constitutes the bottom of said chamber, and supports said article.

12. An X-ray optical system for examining an article, as in claim 4, wherein said mirrors of said first and second reflecting means comprise front surface mirrors.

15. An X-ray optical system for examining an article, as in claim 12, wherein said viewing means further includes an objective lens and an adjustable mirror element which directs the intensified light image of said article into a fourth direction, said image intensifier, said objective lens and said mirror element being disposed in said third direction.

13. An X-ray optical system for examining an inanimate article, comprising:

(a) a source of X-ray directed in a first direction,

(b) fluorescent screen means for converting said X-rays to a light image, said screen means being disposed downstream of said X-ray source in said first direction,

(c) means disposed between said X-ray source and said fluorescent screen means for receiving an article such that said X-rays passing through said article reach said screen means to generate thereat a light image of said article,

(d) a first light reflecting means disposed downstream of said fluorescent screen means in said first direction for receiving said light image from said fluorescent screen means and directing said light image into a second direction,

(e) second light reflecting means disposed opposite and obliquely to said first light reflecting means for receiving said light image reflected from said first light reflecting means and for redirecting said light image in a third direction being opposite to said first direction, and

(f) means including an image intensifier disposed downstream of said second light reflecting means in said third direction for viewing said light image.

14. An X-ray optical system for examining an article, as in claim 13, wherein said viewing means further incudes an optical arrangement having a distant focus of at least three feet from an operator'"'"'s eye position.

16. An X-ray optical system for examining an article, as in claim 13, wherein said article receiving means comprises an X-ray impermeable chamber partially defined by a closable opening by which said article is introduced into said chamber.

17. An X-ray optical system for examining an article, as in claim 16, wherein said fluorescent screen means constitutes the bottom of said chamber, and supports said article.

18. An X-ray optical system for examining an article, as in claim 13, wherein said first and second light reflecting mean comprise mirrors.

19. An X-ray optical system for examining an article, as in claim 18, wherein said mirrors of said first and second reflecting means comprise front surface mirrors.

20. An X-ray optical system for examining an article, as in claim 13, wherein said first and third directions are parallel.