Triaxial Accelerometer

The triaxial accelerometer is a component-level sensor used in computer, electronic, and optical product manufacturing. It is a core element of an Inertial Measurement Unit (IMU), detecting and quantifying linear acceleration in three-dimensional space. This device provides motion data essential for navigation, stabilization, and motion tracking systems. The accelerometer operates on microelectromechanical systems (MEMS) technology, where microscopic mechanical structures deflect under acceleration, causing measurable changes in capacitance, piezoelectric effect, or piezoresistive properties. These changes are converted into electrical signals proportional to acceleration. The sensor is fabricated from silicon, polysilicon, silicon dioxide, and metal electrodes. Key parameters include a measurement range of ±2 to ±16 g (selectable via register, lower range for higher resolution), sensitivity of 0.98 to 7.8 mV/g (depending on range), frequency response of 0 to 1000 Hz (typical for piezo-resistive type), nonlinearity of ±1% FS (full scale best fit straight line), cross-axis sensitivity of ±2% (max error from perpendicular axes), supply voltage of 3.3 to 5.0 V DC (regulated, lower voltage reduces power), current consumption of 0.5 to 1.5 mA (at 3.3V supply), operating temperature of -40 to 85 °C (extended range available on request), shock survival of 10000 g (0.1 ms half-sine pulse), ingress protection of IP65 to IP67 (sealed for industrial environments, per IEC 60529), and weight of 5 to 15 g (without cable). These values are directory reference ranges; verify model-specific values with the manufacturer. The accelerometer is suitable for industrial applications requiring precise motion sensing. When selecting, consider measurement range, sensitivity, frequency response, and environmental ratings. Interfaces typically include digital or analog outputs, but specific interfaces are not listed. Verification questions include checking the calibration certificate, confirming the measurement range and sensitivity for the intended application, and ensuring the ingress protection rating meets the installation environment. Maintenance signals include drift in output, increased noise, or failure to respond to known accelerations. Failure boundaries include exceeding shock survival limits, operating outside temperature range, or exposure to moisture beyond the IP rating.

The triaxial accelerometer uses MEMS technology. Microscopic mechanical structures, typically proof masses, deflect when subjected to acceleration. This deflection alters capacitance, generates a piezoelectric charge, or changes piezoresistive properties. These changes are converted into electrical signals proportional to the applied acceleration. The sensor measures acceleration along three orthogonal axes simultaneously, providing a three-dimensional acceleration vector.