Inertial measurement devices

2 February 2011 Analogue, Mixed Signal, LSI

Analog Devices is helping industrial and medical equipment manufacturers more easily implement motion capture and control features by adding two highly integrated precision MEMS (micro electromechanical system) inertial sensors to its iSensor motion sensor product portfolio.

The new ADIS16334 and ADIS16375 IMUs (inertial measurement units) achieve the accuracy and ease-of-use required to quickly embed navigation, tracking, guidance, instrument control, platform stabilisation and other six-degree-of-freedom sensing functions in equipment ranging from industrial process controls to precision medical instrumentation. The ADIS16334 is 40% smaller than previous-generation IMUs and is optimised for high-density, space-limited applications, while the ADIS16375 is AD’s highest performance IMU with 0,003°/sec gyro stability. The devices require no additional integration, test or calibration. Only power and an industry standard SPI interface are needed to deliver accurate data out-of-the-box.

Gyro bias stability of 12°/hour and accelerometer bias stability of 0,13 mG provide enhanced sensor stability, simplifying system kalman filtering and improving accuracy. A full 330 Hz of bandwidth, coupled with a sample rate up to 2460 Sps, improves overall system response. The devices also feature continuous bias estimation, user selectable decimation filters, user-configurable FIR filter banks, and delta theta and delta velocity outputs. They are complete inertial systems that include a tri-axis gyroscope with ±300°/sec dynamic range, and a tri-axis accelerometer ±18 G (ADIS16375) or ±5 G (ADIS16334).

Factory calibration optimises each sensor for sensitivity, bias, alignment, temperature and linear acceleration stability. As a result, each sensor has its own dynamic compensation formulas that provide accurate sensor measurements over a temperature range of up to -40°C to +105°C. All necessary motion testing and calibration are part of the factory production process to reduce system integration time. Tight orthogonal alignment across all sensors simplifies inertial frame alignment in navigation systems, and an improved SPI interface and register structure provide fast data collection and configuration control.

For more information contact Stella Homan, Avnet Kopp, +27 (0)11 809 6100, [email protected], www.avnet.co.za

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