Multiple shock event sensing device

• US 7,231,804 B1
• Filed: 12/09/2004
• Issued: 06/19/2007
• Est. Priority Date: 12/09/2004
• Status: Expired due to Fees

• Current Assignee: Chief Of Naval Research Office Of Counsel Atten: Ooccip
• Original Assignee: the united states of america as represented by the secretary of the navy
• Inventors: Jean, Daniel, Babcock, Wade, Smith, Gabriel
• Primary Examiner(s): Cygan; Michael
• Assistant Examiner(s): DAVIS, OCTAVIA L
• Application Number:
  US11/009,847
• Time in Patent Office: 922 Days
• Field of Search: 73/120.2, 73/120.3, 73/120.4, 73/120.5, 73/120.7, 73/120.9
• US Class Current: 73/12.07
• CPC Class Codes: G01P 1/127 for acceleration values
• CPC Class Codes: G01P 15/032 by measuring the displacement of a movable inertial mass
• CPC Class Codes: G01P 15/08 with conversion into electric or magnetic values

Abstract

A non-electric, multiple shock event sensing device has shock sensors coupled to a substrate and arranged in an array defined by a plurality of rows and at least one column. At any given time, only one row of shock sensors is readied for the detection of a shock event. The occurrence of a shock event is detected by the readied row while simultaneously causing a next successive row in the array to be readied for detection.

Claims

1. A multiple shock event sensing device, comprising:

a substrate;

shock sensors coupled to said substrate and arranged in an array defined by a plurality of rows and at least one column, each of said shock sensors having a moveable portion and a restraining portion mechanically coupled to said moveable portion and fixed to said substrate for fixing a position of said moveable portion; and

a moveable bar coupled to said substrate and positioned between adjacent rows from said plurality of rows wherein each of said adjacent rows is defined by a first row and a second row, said moveable bar having a contact portion positioned adjacent said moveable portion of each of said shock sensors in said first row, said moveable bar further having a locking portion mechanically coupled to said moveable portion of each of said shock sensors in said second row for preventing movement thereof while superseding functioning of said restraining portion of each of said shock sensors in said second row, wherein any said restraining portion in said first row failing as a result of a shock event allows a corresponding said moveable portion to experience movement and engage said contact portion of said moveable bar to cause a corresponding movement of said moveable bar that mechanically uncouples each said locking portion of said moveable bar from said moveable portion of each of said shock sensors in said second row, wherein said shock sensors in said second row assume a role equivalent to that of said shock sensors in said first row prior to occurrence of said shock event.

2. A multiple shock event sensing device as in claim 1 wherein said at least one column comprises a plurality of columns, and wherein each said restraining portion associated with a column from of said plurality of columns is constructed to fail at an identical shock event magnitude.

3. A multiple shock event sensing device as in claim 2 wherein each column from of said plurality of columns is associated with a unique shock event magnitude.

4. A multiple shock event sensing device as in claim 1 wherein said shock sensors and each said moveable bar are microelectromechanical systems (MEMS)-type devices.

5. A multiple shock event sensing device as in claim 1 wherein each said moveable portion and each said moveable bar is constructed such that said corresponding movement is approximately transverse to said movement of said moveable portion.

6. A multiple shock event sensing device as in claim 1 wherein said plurality of rows and said at least one column comprise a rectangular matrix.

7. A multiple shock event sensing device as in claim 1 further comprising means for detecting said movement of each said moveable portion and for providing an indication thereof.

8. A multiple shock event sensing device as in claim 1 further comprising means for detecting said corresponding movement of each said moveable bar and for providing an indication thereof.

9. A multiple shock event sensing device as in claim 8 further comprising means for detecting said movement of each said moveable portion and for providing an indication thereof.

10. A multiple shock event sensing device as in claim 1 further comprising locking means coupled to said substrate for fixing a position of each said moveable bar immediately following said corresponding movement thereof.

11. A multiple shock event sensing device, comprising:

a substrate;

microelectromechanical systems (MEMS)-based shock sensors coupled to said substrate and arranged in an array defined by a plurality of rows and at least one column, each of said shock sensors having a moveable portion and a restraining portion mechanically coupled to said moveable portion and fixed to said substrate for fixing a position of said moveable portion;

a MEMS-based moveable bar coupled to said substrate and positioned between adjacent rows from said plurality of rows wherein each of said adjacent rows is defined by a first row and a second row, said moveable bar having a contact portion positioned adjacent said moveable portion of each of said shock sensors in said first row, said moveable bar further having a locking portion mechanically coupled to said moveable portion of each of said shock sensors in said second row for preventing movement thereof while superseding functioning of said restraining portion of each of said shock sensors in said second row, wherein any said restraining portion in said first row failing as a result of a shock event allows a corresponding said moveable portion to experience movement and engage said contact portion of said moveable bar to cause a corresponding movement of said moveable bar that mechanically uncouples each said locking portion of said moveable bar from said moveable portion of each of said shock sensors in said second row, wherein said shock sensors in said second row assume a role equivalent to that of said shock sensors in said first row prior to occurrence of said shock event; and

locking means coupled to said substrate for fixing a position of each said moveable bar immediately following said corresponding movement thereof.

12. A multiple shock event sensing device as in claim 11 wherein said at least one column comprises a plurality of columns, and wherein each said restraining portion associated with a column from of said plurality of columns is constructed to fail at an identical shock event magnitude.

13. A multiple shock event sensing device as in claim 12 wherein each column from of said plurality of columns is associated with a unique shock event magnitude.

14. A multiple shock event sensing device as in claim 11 wherein each said moveable portion and each said moveable bar is constructed such that said corresponding movement is approximately transverse to said movement of said moveable portion.

15. A multiple shock event sensing device as in claim 11 wherein said plurality of rows and said at least one column comprise a rectangular matrix.

16. A multiple shock event sensing device as in claim 11 further comprising means for detecting said movement of each said moveable portion and for providing an indication thereof.

17. A multiple shock event sensing device as in claim 11 further comprising means for detecting said corresponding movement of each said moveable bar and for providing an indication thereof.

18. A multiple shock event sensing device as in claim 17 further comprising means for detecting said movement of each said moveable portion and for providing an indication thereof.