VERFAHREN ZUM ERFASSEN DER ROTATION DES GEHAEUSES EINES BOHRLOCHMESSINSTRUMENTS RELATIV ZU EINER BEZUGSLAGE UND MESSWERTUMFORMER DAFUER

摘要

A transducer for sensing the angular position or rate of change of displacement of a housing of a borehole survey instrument with respect to a reference position includes a rotor magnetically suspended within a stator which is in turn secured to the housing. The rotor is constrained by the magnetic suspension to rotate about a single axis relative to the stator. A frame of reference is established for the transducer, against which subsequent measurements are compared. Optical sensing means are included for sensing the movement of the rotor about the axis of motion to develop an indication of the angular position or rate of change of position of the housing.