Patent ID: 9322649
Filing Date: 2016-04-26
CPC Classification: E21B,G01C,G01V

Claim Text:
1. A measurement-while-drilling system, comprising: a lower toroid, wherein the lower toroid has a lower toroid winding and is further adapted to receive a signal from one or more sensors; an upper toroid, wherein the upper toroid has a upper toroid winding; and a magnet disposed along a rotating member within one of the lower toroid or the upper toroid; wherein: one of the lower toroid or the upper toroid is further adapted to engage the rotating member; the lower toroid and the upper toroid are disposed so that a signal from the lower toroid is induced in the upper toroid; and the lower toroid winding is non-uniform so that the signal from the lower toroid induced in the upper toroid is indicative of a rotation rate of the rotating member.