``Jerk'' is defined as the time derivative of acceleration. Simple methods for designing jerkmeters are briefly discussed. The present design consists of a low‐frequency (20 cps) piezoelectric accelerometer, the output of which is electrically differentiated. The response of the instrument is flat within ±7% from zero‐frequency to 18 cps, at 21°C, but changes in response up to 33% are introduced in the range between 10 and 18 cps at temperatures between 12°C and 32°C. A ballistocardiogram is shown, with simultaneous displacement, velocity, acceleration, and jerk records.
REFERENCES
1.
See, for example, D. P. Eckman, Industrial Instrumentation (John Wiley and Sons, Inc., New York, 1950), p. 213.
2.
3.
4.
P. M. Morse, Vibration and Sound (McGraw‐Hill Book Company, Inc., New York, 1936), p. 119.
5.
Manufactured, for example, by the Gulton Manufacturing Corporation, Metuchen, New Jersey.
6.
Draper, McKay, and Lees, Instrument Engineering (McGraw‐Hill Book Company, Inc., New York, 1953), Fig. 19‐4, p. 257.
7.
Manufactured by Dow Corning Corporation, Midland, Michigan.
8.
Cat. 122C759G, manufactured by the General Electric Company.
9.
C. W. Kissinger, Instr. Soc. of Am. Paper No. 54‐40‐1, September, 1954, reprinted March 1955.
10.
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© 1956 The American Institute of Physics.
1956
The American Institute of Physics
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