Miniature Inertial Measurement Unit (IMU)

The new 3DM-GX3-15 miniature Inertial Measurement Unit (IMU), is a lower cost introduction to the LORD MicroStrain 3DM-GX3 range of inertial sensors, and incorporates triaxial accelerometers and triaxial gyros, but without magnetometers. This unit has a USB or RS232 interface as standard.

The main feature of this new system is the small size and weight. Excluding the mounting tabs this sensor is 44mm long, 24mm wide and 11mm high, and weighs just 18 grams. Output modes from this system include acceleration, angular rate, delta angle and velocity, Euler angles and rotation matrix. All quantities are fully temperature compensated and corrected for sensor misalignment.

The 3DM-GX3-15 offers improved performance under vibration, as sensors are sampled at 30kHz and digitally filtered and scaled into physical units. They have a user adjustable data rate up to 1000Hz, and a filter to eliminate gyro drift in the IMU output. A ±5g accelerometer range and ±300deg/sec gyro range are standard, but there are options for other ranges. A lower cost and smaller OEM version is available with a USB or TTL interface, and a smaller connector.

Applications for this device would include inertial aiding of GPS, robotics, platform stabilisation, antenna and camera pointing, and biomechanics. The 3DM-GX3-15 is initially sold as a starter kit consisting of an IMU module, RS-232 or USB communication and power cable, software CD, user manual, and quick start guide.


June 2014

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