Subminiature surface mountable shock accelerometers
This etched silicon chip includes both 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 element is housed within a low-profile, miniature, epoxy sealed subminiature surface mountable package, weighing just 0.06 gram, for minimized mass loading effects. The low mass, small size and unique construction of the MEMS sensing element allows for high resonance frequency, low output impedance, 3x over-range, and zero damping for minimal phase shift over its useful frequency range.
The high resonance frequency of the Endevco 71M series permits their survival in the presence of high-frequency components, in a shock pulse that could otherwise shatter the seismic system of accelerometers having lower resonance frequencies. Because they are undamped, the accelerometers can also accurately respond to fast rise times and short duration shock motion. With a frequency response extending down to dc (steady state), they are ideal for measuring long duration transient shocks while integrating critical acceleration data for velocity and displacement.
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