Rotational Motion Measurement by Integrating Gyroscopes and Accelerometers

Direct measurement of diurnal polar motion by ring laser gyroscopes

[1] We report the first direct measurements of the very small effect of forced diurnal polar motion, successfully observed on three of our large ring lasers, which now measure the instantaneous direction of Earth’s rotation axis to a precision of 1 part in 10 when averaged over a time interval of several hours. Ring laser gyroscopes provide a new viable technique for directly and continuously m...

Rejecting Rotational Disturbances on Small Disk Drives Using Rotational Accelerometers

Small disk drives are inherently designed for portable applications and thus must be able to reject external shock and vibration. This paper expands on previous efforts at using the signal from a rotational accelerometer to minimize the the effects of these disturbances by dealing with several issues that come up: accelerometer beam resonances, low sample rate of the embedded servo on the disk ...

Motion pattern and posture: correctly assessed by calibrated accelerometers.

Basic motion patterns and posture can be distinguished by multichannel accelerometry, as recently shown. A refinement of this method appeared to be desirable to further increase its effectiveness, especially to distinguish walking and climbing stairs, and body rotation during sleep. Recordings were made of 31 subjects, according to a standard protocol comprising 13 motions and postures. This re...

Rotational Motion

Rotational Motion