Tri-axis inertial measurement unit combines seven sensors - Embedded.com

Tri-axis inertial measurement unit combines seven sensors

LONDON — Based on Analog Devices’ iMEMS Motion Signal Processing Technology, the ADIS16355 inertial measurement unit (IMU) provides full-range, multi-axis inertial sensing.

An addition to the iSensor intelligent sensor product family, the IMU combines three axes of angular rate sensing and three axes of acceleration sensing, providing full six-degrees-of-freedom (6DOF) motion measurement to enable the benefits of complex motion analysis in applications such as vehicle-mounted cameras and antennas, commercial aircraft guidance units, robotics, and prosthetics.

Time-consuming motion testing and calibration across temperature and multiple axes is avoided as the ADIS16355 undergoes a comprehensive factory calibration process. The sensor has a programmable interface to ensure it is both precise and ready for integration right out-of-the-box. The ADIS16355 also includes full-temperature-range calibration, versus the room temperature calibration available in the ADIS16350, and provides a superior bias temperature stability of 0.005 deg/sec/°C.

The six-degrees-of-freedom motion sensing is provided by combining a tri-axis gyro (±300°/sec dynamic range) and a tri-axis accelerometer (±10g).

The IMU can compensates for GPS signal loss or vehicle-induced signal irregularities. By detecting tiny shifts in linear acceleration and angular movement, the ADIS16355 provides dead reckoning, allowing vehicles to remain on course until a lost GPS signal is restored.

The ADIS16355 and ADIS16350 are said to provide a 50-times improvement in sensor accuracy compared to other off-the-shelf inertial sensors.

In a form factor smaller than a 1-inch cube, the factory calibration and embedded cross-axial alignment compensation enable designers without sensor expertise to integrate motion sensing technology to their applications. Both the ADIS16355 and ADIS16350 include a programmable serial peripheral interface (SPI) port that provides access for programming features such as filtering, sample-rate, power-management, self-test, and sensor condition status and alarms.

The devices are also fully in-system tunable, allowing designers to debug their system and experiment with different configurations for design optimization.

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