APPENDIX 1

The high-speed photographic camera used at by R.F. Kinsler at the Army Research Laboratory is frequently operated with a repetition rate of 25 microseconds, a pulse duration of 1 microsecond, and a recording array of 304 by 192 pixels. This would yield a spatial resolution at a moving deformation front of 0.26 mm.1 For a BFD displacement rate of 100 m/s, the surface will move by only 0.1 mm during the 1 microsecond that the “shutter” is open, producing a small smear of the 0.26 mm spatial resolution.

A BFD of 40 mm would occur over approximately 1 millisecond. A repetition rate of 25 microseconds would therefore enable about 40 discrete contours of deformation to be recorded during a given shot with a spatial resolution of 0.26 mm and a velocity resolution of about 1 m/s.

1

Question and answer session between R. Kinsler, ARL, and the committee, March 10, 2010.



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Phase II Report on Review of the Testing of Body 48 Armor Materials for Use by the U.S. Army APPENDIX 1 The high-speed photographic camera used at by R.F. Kinsler at the Army Research Laboratory is frequently operated with a repetition rate of 25 microseconds, a pulse duration of 1 microsecond, and a recording array of 304 by 192 pixels. This would yield a spatial resolution at a moving deformation front of 0.26 mm.1 For a BFD displacement rate of 100 m/s, the surface will move by only 0.1 mm during the 1 microsecond that the “shutter” is open, producing a small smear of the 0.26 mm spatial resolution. A BFD of 40 mm would occur over approximately 1 millisecond. A repetition rate of 25 microseconds would therefore enable about 40 discrete contours of deformation to be recorded during a given shot with a spatial resolution of 0.26 mm and a velocity resolution of about 1 m/s. 1 Question and answer session between R. Kinsler, ARL, and the committee, March 10, 2010.

OCR for page 48
Phase II Report on Review of the Testing of Body 49 Armor Materials for Use by the U.S. Army