Propagation velocity compensated position measurement sensor

摘要

A position sensing system including a waveguide, a magnet movable relative to the waveguide, and a compensator configured to compensate for a change in propagation velocity of the waveguide in determining a position of the magnet relative to the waveguide. The compensator coupled to the waveguide and configured to receive a pulse, an end of line pulse corresponding to the pulse transmitted through the waveguide, and a reflected pulse corresponding to a reflection of the pulse at a point in the waveguide. The compensator configured to determine the point based at least in part on the pulse, the end of line pulse, and/or the reflected pulse.

主权项

1. A position sensing system comprising:
a waveguide configured to receive a pulse at a first end and transmit the pulse through the waveguide resulting in an end of line pulse exiting the waveguide at a second end; a magnet moveable relative to the waveguide, the magnet configured to cause a reflected pulse to be reflected back to the first end of the waveguide from a point of impedance discontinuity in the waveguide proximate the magnet; and a compensator electrically coupled to the waveguide and configured to receive the pulse, the end of line pulse, and the reflected pulse and determine the point of impedance discontinuity based at least in part on the pulse, the end of line pulse and the reflected pulse, wherein the compensator comprises:
a pulse generator configured to generate the pulse; anda position determination module configured to receive the pulse, the reflected pulse, and the end of line pulse and determine the point of impedance discontinuity based on a time between receiving the pulse and the reflected pulse and on a time between receiving the pulse and the end of line pulse.