Acceleration recorder and playback module

• US 5,576,491 A
• Filed: 07/21/1994
• Issued: 11/19/1996
• Est. Priority Date: 09/03/1992
• Status: Expired due to Fees

• Current Assignee: United States Incorporated, United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
• Original Assignee: United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
• Inventors: Bozeman, Richard J. Jr.
• Primary Examiner(s): Williams, Hezron E.
• Assistant Examiner(s): Moller, Richard A.
• Application Number:
  US08/281,800
• Time in Patent Office: 852 Days
• Field of Search: 360/6, 365/45, 365/46, 365/47, 365/48, 73/491, 73/492
• US Class Current: 73/491
• CPC Class Codes: G11C 27/00 Electric analogue stores, e.g. for storing instantaneous values

Abstract

The present invention is directed to methods and apparatus relating to an accelerometer electrical signal recorder and playback module. The recorder module may be manufactured in lightweight configuration and includes analog memory components to store data. Signal conditioning circuitry is incorporated into the module so that signals may be connected directly from the accelerometer to the recorder module. A battery pack may be included for powering both the module and the accelerometer. Timing circuitry is included to control the time duration within which data is recorded or played back so as to avoid overloading the analog memory components. Multiple accelerometer signal recordings may be taken simultaneously without analog to digital circuits, multiplexing circuitry or software to compensate for the effects of multiplexing the signals.

Claims

1. An acceleration recorder and playback module responsive to an analog signal from an accelerometer transducer, said analog signal having an amplitude that varies responsively to acceleration, comprising:

an accelerometer signal amplitude regulating circuit, said circuit including means for regulating said amplitude of said analog signal said accelerometer signal amplitude regulating circuit comprising an output contact for outputting an amplitude regulated analog accelerometer signal;

a solid state analog signal storage integrated circuit for storing said amplitude regulated analog accelerometer signal, said solid state analog storage device having a storage capacity to store said amplitude regulated analog accelerometer signal for a first predetermined time duration, said solid state analog signal storage integrated circuit having an analog signal input connection for receiving said amplitude regulated analog accelerometer signal, at least one terminal for receiving a playback--record control signal, and at least one activation control terminal for receiving an activation control signal;

a playback--record switching means, said playback-record switching means being operative to provide said playback--record control signal to said at least one terminal for receiving said playback--record control signal; and

a timing circuit including means for producing a timing signal having a second predetermined time duration less than or equal to said first predetermined time duration, said timing circuit having output circuitry connected to said at least one activation control terminal to provide said activation control signal for enabling operation of said solid state analog signal storage integrated circuit for said second predetermined time duration.

2. The apparatus of claim 1, further comprising:

a housing for protectively enclosing said accelerometer signal conditioning circuit, said solid state analog signal storage integrated circuit, said playback--record switching means, and said timing circuit.

3. The apparatus of claim 1, further comprising:

a battery power supply for providing operating power for said solid state analog signal storage integrated circuit and said timing circuit, and

a current regulating diode for said accelerometer signal amplitude regulating circuit, said diode being connected in series with said accelerometer and said battery power supply output, said diode being operable for regulating electrical current from said battery power supply to said accelerometer.

4. The apparatus of claim 1, wherein:

said solid state analog signal storage integrated circuit is mechanically attachable and detachable from said accelerometer record and playback module.

5. The apparatus of claim 1, further comprising:

a plurality of solid state analog signal storage integrated circuits, and

at least one switch to switch between a first state of operation during which each of said plurality of said solid state analog signal storage integrated circuits are sequentially activated, and a second state of simultaneous operation during which each of said plurality of said solid state analog storage integrated circuits are simultaneously activated.

6. The apparatus of claim 5, further comprising:

an end of data control terminal associated with each of said solid state analog signal storage integrated circuits, and

said at least one switch being connected electrically to said end of data control terminal of at least one of said solid state analog signal storage integrated circuits.

7. The apparatus of claim 1, further comprising:

a plurality of accelerometer signal amplitude regulating circuits, and

a plurality of solid state analog signal storage integrated circuits each having an associated analog signal input connection for receiving an amplitude regulated analog accelerometer signal from a respective one of said plurality of accelerometer signal amplitude regulating circuits, said plurality of solid state analog signal storage devices being simultaneously activated.