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MEMS accelerometer offers 2k hours stability

21 Aug 2013  | Graham Prophet

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The model 1521 surface mount accelerometer series from Silicon Designs is extremely durable. Due to the company's own development and fabrication of MEMS chips, the resulting MEMS variable capacitance accelerometer offers up to 2,000 hours of measurement stability with 6,000g shock survivability and zero signal degradation in temperatures as high as 175 °C.

Designed as a high-performance, pin-compatible drop-in replacement for the company's model 1210 and 1221 series, the model 1521 series features non-ferrous construction and a highly durable nitrogen-damped MEMS sensing element, housed within a miniature hermetically sealed gold ceramic 20-pin LCC or JLCC package. All Silicon Designs accelerometers feature a custom integrated circuit with onboard sending amplifier and differential output stage, with a 0.5 to 4.5V single-ended or ±4V differential output, proportional to the amount of measured acceleration. Series units can respond to either DC or AC acceleration. Each accelerometer is fully calibrated and traceable.

The model 1521 series is available in standard measuring ranges from ±2g to ±200g, with nominal frequency response, either from 0 to 400Hz (±2g) or 0 to 3000Hz (±200g). The model 1521 series is also insensitive to temperature changes and gradients, with signal output unaffected by electromagnetic interference, and requiring no warm-up period. The ±2g version of this series is further offered with very low noise floor, in direct support of seismic and other low-frequency vibration measurements.

The series offers improved long-term measurement stability and repeatability, making it suitable for extended-use shock and vibration measurement applications, particularly within harsh environments. Supported applications include oil and gas downhole monitoring; UAV inertial measurements; tilt and position measurements for antennas, solar panels, wind turbines, hydroelectric spillway doors, and elevators; civil structure seismic monitoring; industrial vibration monitoring and analysis; robotics; and machinery control.

Model 1521 MEMS accelerometer datasheet (PDF)

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