Hardened data acquisition system

• US 5,317,914 A
• Filed: 05/03/1991
• Issued: 06/07/1994
• Est. Priority Date: 05/03/1991
• Status: Expired due to Fees

• Current Assignee: Government of The United State of America As Represented By The Secretary of The Army
• Original Assignee: The United States Of America As Represented By The Secretary Of The Army
• Inventors: Franco, Raphael A. Jr.
• Primary Examiner(s): Chilcot, Jr., Richard E.
• Assistant Examiner(s): BIEGEL, RONALD L
• Application Number:
  US07/695,138
• Time in Patent Office: 1,131 Days
• Field of Search: 73/12.04, 73/12.05, 73/12.09, 73/12.11, 73/167, 73/178 H, 73/178 R, 73/178 T, 73/12.01, 364/424.06, 364/550, 220/429, 220/468, 206/521
• US Class Current: 73/167
• CPC Class Codes: G01D 11/24 Housings ; Casings for instruments
• CPC Class Codes: G01P 1/127 for acceleration values

Abstract

The hardened data acquisition system (HDAS) of the present invention is a mpact system built to fit within a canister container, which may be inserted in a moving projectile, such as an artillery shell. Any shock level, air pressure or acceleration/deceleration experienced by the HDAS is measured by a transducer as an analog signal. The analog signal, after proper amplification and filtering, is fed to an analog-to-digital converter and converted into a digital signal. The digital signal is in turn fed to a memory where a predetermined amount of the data is recorded. The thus recorded data can be downloaded to the external environment by an interface section. To provide integrity, the different electronic circuit components of the HDAS are encased in plastic instead of ceramic. Moreover, the different electronic components are encapsulated with an epoxy resin, before being inserted into a canister container. After insertion, the container is filled with shock isolation micro-balloon particles to envelop the electronic components. With such a configuration, the HDAS is able to withstand a tremendous amount of force and still be able to accurately record the acquired data. The HDAS is also able to maintain its memory for several months due to the very low power requirement in standby status, thus affording measurements in areas prohibiting immediate re- entry.

Claims

1. A self contained data acquisition apparatus, comprising:

a. at least one transducer means for detecting shock levels effected by an explosive source;

b. signal conditioning means for obtaining an analog signal representative of the detected shock levels from said transducer means;

c. means for converting the analog signal to a corresponding digital signal;

d. memory means for storing the digital signal as data;

e. processing means for controlling the operation of at least said signal conditioning, converting and memory means;

f. container means for enclosing in a given space at least said signal means, converting, memory and processing means;

g. means for encapsulating at least said signal conditioning, converting, memory and processing means; and

h. means within the container means for at least shock isolationally enveloping said signal conditioning, converting, memory and processing means;

wherein said container means and said enveloping and encapsulating means substantially prevent shock forces caused by said explosive source, as well as electrical and magnetic effects outside said container means, from adversely affecting said signal conditioning, converting, memory and processing means.

2. The apparatus according to claim 1, further comprising power means for supplying power to said signal conditioning, converting, memory and processing means;

wherein said power means is enclosed in the given space of said container means and is encapsulated and shock isolationally enveloped by said encapsulating and enveloping means, respectively.

3. The apparatus according to claim 1, further comprising:

a. interface means electrically connected to at least said control and memory means for providing interfacing between said apparatus and external equipment;

b. wherein the data stored in said memory means can be downloaded by said external equipment; and

c. wherein said external equipment can provide signals to at least calibrate and test said apparatus.

4. The apparatus according to claim 1, further comprising switch means situated within the given space of said container means, and electrically connected to said processing means, for automatically triggering said memory means to store the signal representative of the detected shock levels when a predetermined shock level is reached.

5. The apparatus according to claim 1, further comprising optical means situated within the given space of said container means for isolating said apparatus from faulty ground signals transmitted thereto, thereby ensuring that said apparatus operates independently of other data acquisition apparatus.

6. The apparatus according to claim 1,

a. wherein said memory means, once initiated, begins to store data in a wrap-around mode whereby, once said memory means is full, the oldest data in said memory means is continuously being replaced by the newest data;

and

b. wherein said memory means, once triggered to accept the data representative of said detected shock levels, begins to store said detected shock levels data until a predefined substantial portion of said memory means contains said detected shock levels data and a predefined portion of said memory means contains data stored prior to said memory means being triggered to accept said detected shock levels data.

7. The apparatus according to claim 1, wherein said signal conditioning means comprises:

a. first amplifier means for receiving the analog signal;

filter means for filtering from the analog signal frequencies above a chosen predetermined upper limit; and

b. second amplifier means for amplifying the filtered analog signal.

8. The apparatus according to claim 1, wherein said converting means comprises a flash type analog to digital converter for converting the analog signal t the digital signal.

9. The apparatus according to claim 1, wherein said processing means comprises:

a. first circuit means for providing different commands to said memory means; and

b. second circuit means for addressing and selecting particular portions of said memory means to store data representative of said detected shock levels.

10. The apparatus according to claim 9, wherein said first circuit means comprise:

a. a timer circuit for providing timing to said processing means;

b. an initiating circuit for initiating said memory means to begin storing data in a wrap-around mode; and

c. a trigger circuit for triggering said memory means to store data representative of said detected shock level until a predefined substantial portion of said memory means contains said detected shock level data.

11. The apparatus according to claim 1, wherein said encapsulating means comprises STYCAST.

12. The apparatus according to claim 1, wherein said enveloping means comprises silicon micro-balloon particles.

13. The apparatus according to claim 1, wherein said converting means and said processing means are packaged in plastic.

25. The apparatus according to claim 1, wherein said converting means and said processing means are packaged in plastic.

14. A self contained data acquisition apparatus to be carried by a projectile, comprising:

a. at least one transducer means for detecting impact levels encountered by said projectile from the time it is launched to when it lands;

b. signal conditioning means for obtaining an analog signal representative of the detected impact levels from said transducer means;

c. means for converting the analog signal to a corresponding digital signal;

d. memory means for storing the digital signal as data;

processing means for controlling the operation of said signal conditioning, converting and memory means;

e. container means for enclosing in a given space at least said signal conditioning, converting, memory and processing means;

f. means for encapsulating at least said signal conditioning, converting, memory and processing means; and

g. means within the container means for shock isolationally enveloping at least said signal conditioning, converting, memory and processing means;

h. wherein said container means and said enveloping and encapsulating means substantially prevent shock forces caused by impacts encountered by said projectile, as well as electrical and magnetic effects outside said container means, from adversely affecting said signal conditioning, converting, memory and processing means.

15. The apparatus according to claim 14, further comprising:

a. power means for supplying power to said signal conditioning, converting, memory and processing means; and

b. wherein said power means is enclosed in the given space of said container means and is encapsulated and shock isolationally enveloped by said encapsulating and enveloping means, respectively.

16. The apparatus according to claim 14, further comprising:

a. interface means electrically connected to at least said control and memory means for providing interfacing between said apparatus and external equipment;

b. wherein the data stored in said memory means can be downloaded by said external equipment; and

c. wherein said external equipment can provide signals to at least calibrate and test said apparatus.

17. The apparatus according to claim 14, further comprising switch means situated within the given space of said container means, and electrically connected to said processing means, for automatically triggering said memory means to store the signal representative of the detected shock levels when a predetermined shock level is reached.

18. The apparatus according to claim 14, wherein said memory means, once initiated, begins to store data in a wrap-around mode whereby, once said memory means is full, the oldest data in said memory means is continuously being replaced by the newest data;

and

wherein said memory means, once triggered to accept the data representative of said detected shock levels, begins to store said detected shock levels data until a predefined substantial portion of said memory means contains said detected shock levels data and a predefined small portion of said memory means contains data stored prior to said memory means being triggered to accept said detected shock levels data.

19. The apparatus according to claim 14, wherein said signal conditioning means comprises:

a. first amplifier means for receiving the analog signal;

b. filter means for filtering from the analog signal frequencies above a chosen predetermined upper limit; and

c. second amplifier means for amplifying the filtered analog signal.

20. The apparatus according to claim 14, wherein said converting means comprises a flash type analog to digital converter for converting the analog signal to the digital signal.

21. The apparatus according to claim 14, wherein said processing means comprises:

a. first circuit means for providing different commands to said memory means; and

b. second circuit means for addressing and selecting particular portions of said memory means to store data representative of said detected shock levels.

22. The apparatus according to claim 14, wherein said first circuit means comprise:

a. a timer circuit for providing timing to said processing means;

b. an initiating circuit for initiating said memory means to begin storing data in a wrap-around mode; and

c. a trigger circuit for triggering said memory means to store data representative of said detected shock level until a predefined substantial portion of said memory means contains said detected shock level data.

23. The apparatus according to claim 14, wherein said encapsulating means comprises STYCAST.

24. The apparatus according to claim 14, wherein said enveloping means comprises silicon micro-balloon particles.

26. The apparatus according to claim 14, wherein said container means comprises a canister to be inserted in said projectile.

27. A self contained data acquisition apparatus to be carried by a projectile, comprising:

a. at least one transducer means for detecting motions of said projectile during flight;

b. signal conditioning means for obtaining an analog signal representative of the detected motions from said transducer means;

c. means for converting the analog signal to a corresponding digital signal;

d. memory means for storing the digital signal as data;

e. processing means for controlling the operation of at least said signal conditioning, converting and memory means;

f. container means for enclosing in a given space at least said signal conditioning, converting, memory and processing means;

g. means for encapsulating at least said signal conditioning, converting, memory and processing means; and

h. means within the container means for at least shock isolationally enveloping said signal conditioning, converting, memory and processing means;

wherein said container means and said enveloping and encapsulating means substantially prevent forces encountered by said projectile during flight, as well as electrical and magnetic effects outside said container means, from adversely affecting said signal conditioning, converting, memory and processing means.

28. The apparatus according to claim 27, further comprising:

a. power means for supplying power to said signal conditioning, converting, memory and processing means;

b. wherein said power means is enclosed in the given space of said container means and is encapsulated and shock isolationally enveloped by said encapsulating and enveloping means, respectively.

29. The apparatus according to claim 27, further comprising:

a. interface means electrically connected to at least said control and memory means for providing interfacing between said apparatus and external equipment;

b. wherein the data stored in said memory means can be downloaded by said external equipment; and

c. wherein said external equipment can provide signals to at least calibrate and test said apparatus.

30. The apparatus according to claim 27, further comprising switch means situated within the given space of said container means, and electrically connected to said processing means, for automatically triggering said memory means to store the signal representative of the detected shock levels when a predetermined shock level is reached.

31. The apparatus according to claim 27, wherein said memory means, once initiated, begins to store data in a wrap-around mode whereby, once said memory means is full, the oldest data in said memory means is continuously being replaced by the newest data;

and

wherein said memory means, once triggered to accept the data representative of said detected shock levels, begins to store said detected shock levels data until a predefined substantial portion of said memory means contains said detected shock levels data and a predefined small portion of said memory means contains data stored prior to said memory means being triggered to accept said detected shock levels data.

32. The apparatus according to claim 27 wherein said signal conditioning means comprises:

a. first amplifier means for receiving the analog signal;

b. filter means for filtering from the analog signal frequencies above a chosen predetermined upper limit; and

c. second amplifier means for amplifying the filtered analog signal.

33. The apparatus according to claim 27, wherein said converting means comprises a flash type analog to digital converter for converting the analog signal to the digital signal.

34. The apparatus according to claim 27, wherein said processing means comprises:

a. first circuit means for providing different commands to said memory means; and

b. second circuit means for addressing and selecting particular portions of said memory means to store data representative of said detected shock levels.

35. The apparatus according to claim 27, wherein said first circuit means comprise:

a. a timer circuit for providing timing to said processing means;

b. an initiating circuit for initiating said memory means to begin storing data in a wrap-around mode; and

c. a trigger circuit for triggering said memory means to store data representative of said detected shock level until a predefined substantial portion of said memory means contains said detected shock level data.

36. The apparatus according to claim 27, wherein said encapsulating means comprises STYCAST.

37. The apparatus according to claim 27, wherein said enveloping means comprises silicon micro-balloon particles.

38. The apparatus according to claim 27, wherein said transducer means comprises an accelerometer for measuring the acceleration of said projectile.