Electronic sensing screen for measuring projectile parameters

• US 4,864,515 A
• Filed: 03/30/1987
• Issued: 09/05/1989
• Est. Priority Date: 03/30/1987
• Status: Expired due to Fees

• Current Assignee: Alliant Techsystems Incorporated (Northrop Grumman Corporation)
• Original Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Inventors: Deck, Leslie L.
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): Ramirez, Ellis B.
• Application Number:
  US07/031,951
• Time in Patent Office: 890 Days
• Field of Search: 356/4, 356/5, 356/28, 356/285, 356/141, 324/178, 364/516, 364/561, 364/565, 364/900, 250/553, 250/203 R, 250/222.2, 250/225
• US Class Current: 702/142
• CPC Class Codes: G01P 3/685 for projectile velocity measurements

Abstract

A unique electronic sensing screen apparatus for automatically measuring various parameters of moving projectiles. Projectiles pass between an artificial or natural light source and light sensors, resulting in signals from the sensors, which are processed into data showing projectile profiles or photo-like images, shock waves, velocity, angle of attack, and dispersion. The apparatus provides quick turn-around times between parameter measurements, such as those of many projectiles fired in rapid succession, and readily usable results.

Claims

1. An electronic sensing apparatus, for measuring various parameters of moving projectiles, comprising:

detecting means for establishing a field of view and for detecting radiation and said radiation is occluded when said moving projectiles pass between a source of said radiation and said means for detecting said radiation, comprising;

a photocell array; and

a fiber optics assembly connected to said photocell array;

processing means, connected to said detecting means, for processing detection signals, comprising;

converting means, connected to said detecting means, for converting detected radiation into signals indicative of said moving projectiles;

storage means, connected to said converting means, for storing said detection signals;

timing means, connected to said detecting means, to said converting means and to said storage means, for providing a clock signal;

fast trigger logic means, connected to said timing means and to said converting means, for providing a trigger signal; and

computing means, connected to said storage means, for computing said detection signals.

2. Apparatus according to claim 1 wherein said computing means comprises a computer for computing various parameters from said signals, such as speed, dispersion, pitch, yaw, and shape of said moving projectiles, by comparingimage and timing data to a computer-constructed model image of a projectile via a mathematical comparison method.

3. Apparatus according to claim 1 further comprising display means for displaying computed parameters of said moving projectiles.

4. Apparatus according to claim 1 wherein said storage means further comprises a storage memory means for receiving and storing said electronic signals from said first-in-first-out memory means.

5. Apparatus according to claim 1 wherein said source of radiation is the sun.

6. Apparatus according to claim 5 wherein said detecting means comprises:

a first radiation detector; and

a second radiation detector located a distance from said first radiation detector.

7. Apparatus according to claim 5 wherein said detecting means comprises a receptor array means for detecting sunlight from said sun and for converting said detected sunlight into electronic analog signals.

8. Apparatus according to claim 7 wherein said converting means comprises an analog-to-digital converter means for converting said electronic analog signals into electronic digital signals.

9. Apparatus according to claim 8 wherein said electronic digital signals represent only discrete values of black and white.

10. Apparatus according to claim 8 wherein said electronic digital signals represent various shades of gray and discrete values of black and white.

11. Apparatus according to claim 10 wherein said converting means comprises a first-in-first-out memory means for receiving and holding said electronic digital signals from said analog-to-digital converter means.

12. Apparatus according to claim 1 further comprising a source of radiation.

13. Apparatus according to claim 12 wherein said source of radiation emits laser light.

14. Apparatus according to claim 12 wherein said source of radiation comprises a means for collimating light.

15. Apparatus according to claim 12 wherein said source of radiation comprises a light transmitting means for transmitting laser light in two parallel but separate planes having the directions of the light in the respective planes approximately perpendicular to each other.

16. Apparatus according to claim 15 wherein said detecting means comprises receptor means for detecting said laser light from said light transmitting means, and for converting said detected laser light into electronic analog signals.

17. Apparatus according to claim 16 wherein said converting means comprises an amplification and threshold detection means for amplifying and threshold detecting said electronic analog signals from said receptor means for conversion to electronic digital signals.

18. Apparatus according to claim 17, wherein said converting means comprises a logic circuit latch means for temporarily holding said electronic digital signals from said amplification and threshold detection means.

19. Apparatus according to claim 18, wherein said storage means further comprises a first-in-first-out buffer memory means for receiving and holding said electronic digital signals from said logic circuit latch means.

20. Apparatus according to claim 19, wherein said storage means further comprises a storage memory means for receiving and storing said electronic digital signals from said first-in-first-out buffer memory means.

21. Apparatus according to claim 20 wherein said computing means further comprises a computer for receiving electronic digital signals from said storage memory means and computing from said electronic digital signals, various parameters, such as speed, dispersion, pitch, yaw, and shape of said moving projectiles.

22. Apparatus according to claim 20 wherein said processing means comprises a timing means for providing a clock signal to said logic circuit latch means, said first-in-first-out buffer memory means, and said storage memory means.

23. Apparatus according to claim 22 wherein said processing means comprises a fast trigger logic means for providing a trigger start signal to said logic circuit latch means, said first-in-first-out buffer memory means, and a memory enable signal to said storage memory means.

24. An electronic sensing apparatus, for measuring various parameters of moving projectiles, comprising:

a first laser light means for emitting a first laser light;

a first light transmitting means for transmitting said first laser light in a first thin plane approximately orthogonal to direction of said moving projectiles;

a second laser light means for emitting a second laser light;

a second light transmitting means for transmitting said second laser light in a second thin plane approximately orthogonal to direction of said moving projectiles and approximately parallel to and proximate to said first thin plane and having said second laser light in a direction approximately perpendicular to the direction of said laser light;

a first receptor array means for detecting said first laser light from said first light transmitting means and converting said detected first laser light into a first set of electronic analog signals;

a second receptor array means for detecting said second laser light from said second light transmitting means and converting said detected second laser light into a second set of electronic analog signals;

a first amplification and threshold detection means for amplifying and threshold detecting said first set of electronic analog signals from said first receptor array means, for conversion into a first set of electronic digital signals, and a second amplification and threshold detecting means for amplifying and threshold detecting said second set of electronic analog signals from said second receptor array means, for conversion into a second set of electronic digital signals;

a first logic circuit latch means for temporarily holding said first set of electronic digital signals from said first amplification and threshold detection means, and a second logic circuit latch means for temporarily holding said second set of electronic digital signals from said second amplification and threshold detection means;

a first-in-first-out buffer memory means for receiving and holding said first and second sets of electronic digital signals from said first and second logic circuit latch means;

a storage memory means for receiving and storing said first and second sets of electronic digital signals from said first-in-first-out buffer memory means;

an oscillator and timer means for providing a clock signal to said first and second logic circuit latch means, said first-in-first-out buffer memory means, and said storage memory means; and

a fast trigger logic means for providing a trigger start signal to said first and second logic circuit latch means, said first-in-first-out buffer memory means, and a memory enable signal to said storage memory means.

25. Apparatus according to claim 24 wherein said electronic digital signals represent only discrete values of black and white.

26. Apparatus according to claim 24 wherein said electronic digital signals represent various shades of gray and discrete values of black and white.

27. Apparatus according to claim 26 further comprising:

a computer means for receiving said first and second sets of electronic digital signals from said storage memory means and for computing various parameters, such as speed, dispersion, pitch, yaw and shape of said moving projectiles.

28. Apparatus according to claim 24 wherein said first receptor array means comprises a fiber optics assembly.

29. Apparatus according to claim 28 wherein said second receptor array means comprises a fiber optics assembly.

30. A method for measuring various parameters of moving projectiles, comprising:

detecting radiation and said radiation is occluded when said moving projectiles pass by;

converting detected radiation into electronic signals;

providing a fast trigger signal when said radiation is first occluded;

storing, upon receipt of the fast trigger signal, said electronic signals in a first-in-first-out manner;

computing from said electronic signals, various parameters of said moving projectiles; and

displaying said various parameters of said moving projectiles.

31. Method according to claim 30 further comprising a step of providing said radiation.

32. Method according to claim 31 wherein said step for providing radiation further comprises collimating said radiation.

33. An electronic sensing apparatus, for measuring various parameters of moving projectiles, utilizing natural or ambient radiation, comprising:

first detector means, having a first field of view located at a first position, for detecting said radiation and detecting occulusions of said radiation in said first field of view wherein said occlusions are caused by said moving projectiles passing through said first field of view;

second detector means, having a second field of view located at a second position, for detecting said radiation and detecting occlusions of said radiation in said second field of view wherein said occlusions are caused by said moving projectiles passing through said second field of view; and

processing means, connected to said first and second detector means, for processing information from said first and second detectors into at least one parameter, such as speed, dispersion, pitch, yaw, or shape, of said moving projectiles.

34. Apparatus of claim 33 wherein:

said first detector means outputs a first set of electronic analog signals containing information about detecting said radiation and detecting occlusions of said radiation;

said second detector means outputs a second set of electronic analog signals containing information about detecting said radiation and detecting occlusions of said radiation;

said first field of view has an approximate form of a plane approximately perpendicular to a direction of said moving projectiles; and

said second field of view has an approximate form of a plane approximately perpendicular to the direction of said moving projectiles.

35. Apparatus of claim 34 wherein said processing means comprises:

first amplification and threshold detection means for amplifying and threshold detecting said first set of electronic analog signals from said first detector means, for conversion into a first set of electronic digital signals, and a second amplification and threshold detecting means for amplifying and threshold detecting said second set of electronic analog signals from said second detector means, for conversion into a second set of electronic digital signals;

first logic circuit latch means for temporarily holding said first set of electronic digital signals from said first amplification and threshold detection means, and a second logic circuit latch means for temporarily holding said second set of electronic digital signals from said second amplification and threshold detection means;

first-in-first-out buffer memory means for receiving and holding said first and second sets of electronic digital signals from said first and second logic circuit latch means;

storage memory means for receiving and storing said first and second sets of electronic digital signals from said first-in-first-out buffer memory means;

oscillator and timer means for providing a clock signal to said first and second logic circuit latch means, said first-in-first-out buffer memory means, and said storage memory means;

fast trigger logic means for providing a trigger start signal to said first and second logic circuit latch means, said first-in-first-out buffer memory means, and a memory enable signal to said storage memory means; and

computer means for receiving said first and second sets of electronic digital signals from said storage memory means and for computing various parameters, such as speed, dispersion, pitch, yaw and shape of said moving projectiles.