![]() The typical two-axis accelerometer gives users a direction of gravity in an aircraft, smartphone, car or other device. In comparison, the accelerometer measures linear acceleration based on vibration. Using the key principles of angular momentum, the gyroscope helps indicate orientation. ![]() When gauging the rate of rotation around the roll axis of an aircraft, it identifies an actual value until the object stabilizes out. The gyroscope maintains its level of effectiveness by being able to measure the rate of rotation around a particular axis. If you were to consider this handicap when used in an aircraft, the accelerometer quickly loses much of its appeal. When accelerating in a particular direction, the accelerometer is unable to distinguish between that and the acceleration provided through Earth's gravitational pull. ![]() In a way, the accelerometer can gauge the orientation of a stationary item with relation to Earth's surface. The main difference between the two devices is simple: one can sense rotation, whereas the other cannot. The first accelerometer was called the Atwood machine and was invented by the English physicist George Atwood in 1783, according to the book "Practical MEMS," by Ville Kaajakari. ![]()
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