Angular rate and position transducer for borehole survey...

Details Angular rate and position transducer for borehole survey... Angular rate and position transducer for borehole survey...

G - Physics

01

C

33/96, 340/135.8

G01C 17/02 (2006.01) E21B 47/022 (2006.01) G01D 11/02 (2006.01) G01P 3/486 (2006.01)

Patent

CA 1196183

Angular Rate and Position Transducer For Borehole Survey Instrument Abstract A transducer for sensing the angular position or rate of change of displacement of a housing of a bore- hole survey instrument with respect to a reference posi- tion 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 indica- tion of the angular position or rate of change of posi- tion of the housing.

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