Random pattern tracking acceleration tolerance tester

• US 4,619,506 A
• Filed: 08/29/1984
• Issued: 10/28/1986
• Est. Priority Date: 08/29/1984
• Status: Expired due to Fees

• Current Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Original Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Inventors: Repperger, Daniel W., Ratino, David A., Jennings, Thomas J.
• Primary Examiner(s): Bovernick, Rodney B.
• Assistant Examiner(s): DZIERZYNSKI, PAUL M
• Application Number:
  US06/645,390
• Time in Patent Office: 790 Days
• Field of Search: 351/243, 351/244, 351/224, 351/225, 351/226
• US Class Current: 351/243
• CPC Class Codes: A61B 3/024 for determining the visual field, e.g. perimeter types
• CPC Class Codes: A61B 5/18 for vehicle drivers or machine operators

Abstract

A G force acceleration effects monitoring apparatus involving a pair of LED or other visual stimulus arrays, one randomly patterned by an electronic driving apparatus and one patterned by the manipulation of a G force test subject. The electronic driving apparatus preferably includes a sum of sines algorithm and the test subject manipulations are received preferably from a joystick controller. Mounting of the apparatus in a centrifuge gondola and also in off-line training stations and use of the invention by animals are also disclosed.

Claims

1. G force response measuring apparatus comprising the combination of:

a first array of visual stimulus elements dispersed around the preripheral view area of a test subject;

means for energizing said first array elements to a visual stimulating state thereof according to a first random time pattern;

a second array of visual stimulus elements dispersed around the peripheral view area of said test subject, each second array element being located adjacent a first array element;

means for energizing said second array elements to a visual stimulating state thereof in a second test subject controlled pattern tracking said first pattern to the best degree attainable by said test subject; and

means for determining the difference error between said first and second patterns.

2. The apparatus of claim 1 wherein said means for determining the difference error between said first and second patterns is responsive to both first to second pattern displacement differences and first to second pattern time delay differences.

3. The apparatus of claim 1 wherein said first and second patterns comprise a moving transition between energized and nonenergized stimulus elements.

4. The apparatus of claim 3 wherein each said first and second patterns comprise energization of a single array element at one time.

5. The apparatus of claim 4 wherein said visual stimuli array elements are comprised of light emitting diodes.

6. The apparatus of claim 5 wherein said first array and second array elements emit light of two different colors.

7. The apparatus of claim 6 wherein said two different colors are red and green.

8. The apparatus of claim 7 further including an arraycenter visual stimulus element of contrasting color and full time energization.

9. The apparatus of claim 8 wherein said light emitting diodes are located at one and one-half degree arcuate intervals around the peripheral view of said test subject and wherein said contrasting color element comprises a white light element located in the array center position of each array.

10. The apparatus of claim 1 further including scoring means responsive to differences between said first and second patterns.

11. The apparatus of claim 10 wherein said scoring means includes a root means square evaluation of time and amplitude differences between said first and second patterns.

12. The apparatus of claim 1 wherein said first pattern includes a sum of sines pseudo-random algorithm.

13. The apparatus of claim 12 wherein said sum of sines algorithm includes at least five non-integral related sine waves.

14. The apparatus of claim 1 wherein said test subject is a human.

15. The apparatus of claim 14 wherein said visual stimulus elements are located in a semicircular, movably mounted light bar extending around the peripheral view of said human test subject.

16. The apparatus of claim 12 wherein said means controlled by said test subject includes a joystick control element.

17. The apparatus of claim 1 wherein said means for determining difference error includes a chart recorder capable of simultaneous recording of first and second pattern events.

18. A method of determining the endurance limit of a human test subject to acceleration G forces comprising the steps of:

moving a first visual stimulus randomly about the peripheral extending view field of said test subject;

tracking the position of said first visual stimulus with a test subject-controlled simultaneously observed second visual stimulus that is position movable into and out of coincidence with said first visual stimulus in response to said test subject control; and

sensing the loss of stimulus tracking ability in the test subject peripheral view field with G force exposure.

19. Apparatus for measuring the G force response of a test subject comprising:

first visual stimulus means movable in location around the peripheral view field of said test subject;

means for moving said first visual stimulus means randomly about said peripheral view field;

second visual stimulus means movable in location around said peripheral view field in response to control by said test subject for tracking the position of said first visual stimulus means in response to control by said test subject; and

means for sensing the G force-induced loss of stimuli tracking capability in far peripheral view field areas of said test subject.

20. The apparatus of claim 19 wherein said means for moving randomly includes a sum of sines movement algorithm.

21. The apparatus of claim 20 wherein said visual stimuli comprise light emitting diode elements.

22. The apparatus of claim 21 further including additional first and second stimulus light emitting diode element arrays located remote said first and second visual stimulus means.

23. The apparatus of claim 22 further including hinged mounting means for removably positioning said visual stimulus means with respect to a test subject.