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SpotSee Impact Indicator Technical Data
IMPACT INDICATOR ACTIVATION BASICS
Two components comprise an impact – amplitude of
acceleration (G) and duration of impact (msec). These
components are illustrated in the graph below. The
area under the curve represents the change in
velocity (Δv).
ShockWatch impact indicator shock response curves are based on a half-sine shock pulse (shown above). A time, acceleration
point on the half-sine curve can be correlated to the same point on the impact indicator activation response curves.
The vertical axis of each ShockWatch impact indicator activation curve shows a linear scale and is titled “G” or “G-level.” This
value is the acceleration scale. A “G” is a multiple of the acceleration due to gravity (32.2ft/s2 or 9.8m/s2). The horizontal axis
of the graph shows a linear scale titled “t” and represents the time duration. The unit of measure for this scale is milliseconds.
The most critical thing to observe from the curve is that as duration decreases, acceleration increases. Each SpotSee
impact indicator has a minimum G-threshold that must be exceeded before it will activate. The minimum G-level for each
impact indicator is the leftmost G-value on the curve (the G-value where the shock curve intersects the left acceleration
scale). If this minimum G-value is not exceeded, regardless of the duration or the Δv, the device will not activate.
Response curves are measured with a drop system filtering at 3 kHz. Use of a different frequency filter will change the
response curve.
If you have any questions or are unsure of how to interpret SpotSee products, please contact SpotSee or your local
distributor for assistance.