Freescale Semiconductor, Inc.
the object from dc to 400Hz. Normally, the peak impact pulse
CONCEPT OF IMPACT MEASUREMENT
is in the order of a few miniseconds. Figure 2 shows a typical
crash waveform of a toy car having a stiff bumper.
During an impact, the accelerometer will be oriented as
showninFigure1tomeasurethedecelerationexperiencedby
50
PEAK IMPACT PULSE
40
30
20
10
0
–10
–20
–30
–40
0
10
20
30
40
50
60
TIME (ms)
Figure 2. Typical Crash Pattern
2–66
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Motorola Sensor Device Data
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