Subminiature SMT Accelerometers Introduced


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SAN JUAN CAPISTRANO, Calif. Endevco Corporation introduced the model 71 series surface mount piezoresistive accelerometer as a subminiature addition to their existing line of high shock sensors for aerospace and test-and-measurement applications. The model 71 was created by the company's transducer engineering and MEMS manufacturing teams.

The model 71 series features an undamped design for shock measurements from 6,000 60,000g and sensitivities from 3 30 uV/g. An internal sensing system is micro-machined from one piece of silicon. It includes inertial mass and strain gages arranged in an active, four-arm, Wheatstone bridge circuit, with an on-chip zero-balance network. The product combines high resonant frequency with low output impedance, high over range, and zero damping for no phase shift. Acceleration data can be integrated to obtain velocity and displacement measurements.

High resonant frequency permits survival in the presence of the high frequency components in a shock pulse, which could shatter the seismic system of a surface mount accelerometer. With resonant frequencies from 180 700kHz and zero damping, the subminiature series is said to respond accurately to the fast-rise-time, short-duration shock events typical of munitions fusing, kinetic impact testing, and high shock component test applications.

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