Angle sensor using thermal conductivity for a steerable boring tool

摘要

An angle sensor for determining the roll angle of a rotating member is provided. The angle sensor includes an array of paired electrical components, each electrical component having an electrical characteristic which varies as a function of temperature. A fluid responsive to the rotation of the rotating member causes the electrical characteristic of a first one of each pair of electrical components to be different than the electrical characteristic of a second one of each pair of electrical components. A comparator compares the electrical characteristics of the first and second ones of each pair of electrical components to determine the roll angle of the rotatable member.