The Readout Axis Stability Of Elastic Nearly Spherical Gyro Rotors
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The Readout-axis Stability of Elastic Nearly Spherical Gyro Rotors
Precision autocollimator readout of nearly spherical free-rotor gyroscopes, using a reflecting optical flat, requires that the normal to the flat be aligned with the rotor axis of maximum inertia and that the alignment remains stable during gyro operation. The normal to the flat is defined as the readout axis of the instrument; angular misalignments between the normal and the axis of maximum inertia are called 'flat position errors.' In previous research, initial alignment to within 2 arcseconds has been achieved; however, rotor flat-position errors were found to vary significantly when the gyro spin speed or temperature was changed. This investigation studies the variations as elastic phenomena so that the accuracy and stability of readout-axis orientation in arbitrary free-rotor gyroscopes can be understood. (Author).