- 6000 to 60 000 g full range
- High resonant frequency
- DC response
- Rugged undamped
- Negligible zero shift after shock
- 0.06 gram weight
The Endevco® model 71 series of subminiature SMT
piezoresistive accelerometers are rugged undamped
accelerometers designed for shock measurements.
Endevco micro-machines the sensing system
of the 71 from a single piece of silicon. This etched silicon
chip includes the inertial mass and strain gages arranged
in an active four-arm Wheatstone bridge circuit complete
with a novel on-chip zero balance network.
The low mass, extremely small size and unique
construction of the element blends an exceptionally high
resonant frequency with characteristics such as low output
impedance, high overrange, and zero damping for no
phase shift. The high resonant frequency of these sensors
permits their survival in the presence of the high frequency
components in a shock pulse that could shatter the seismic
system of accelerometers having lower resonance.
High resonant frequencies and zero damping also allow
the accelerometers to respond accurately to fast rise time,
short duration shock motion. With a frequency response
extending down to dc (steady state accelerations) these
transducers are ideal for measurement of long duration
transients, and permit integration of the accleration data to
obtain velocity and displacement.
