Get IMU acceleration of a direction when tilted

1. How does an IMU know which way is down?
2. Does IMU measure gravity?
3. What does a magnetometer do in an IMU?
4. What is an IMU biomechanics?

How does an IMU know which way is down?

As the name might suggest an IMU is capable of measuring orientation data and to achieve this it uses a combination of three sensors, namely Accelerometer, Gyroscope, and Magnetometer.

Does IMU measure gravity?

An Inertial Measurement Unit, also known as IMU, is an electronic device that measures and reports acceleration, orientation, angular rates, and other gravitational forces.

What does a magnetometer do in an IMU?

Magnetometer: A magnetometer, as the name suggests, measures magnetic fields. It can detect fluctuations in Earth's magnetic field, by measuring the air's magnetic flux density at the sensor's point in space. Through those fluctuations, it finds the vector towards Earth's magnetic North.

What is an IMU biomechanics?

Inertial measurement units (IMUs) offer the ability to measure walking gait through a variety of biomechanical outcomes (e.g., spatiotemporal, kinematics, other). Although many studies have assessed their validity and reliability, there remains no quantitive summary of this vast body of literature.