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US 2006/0186876 A1Published application
Linear variable differential transformers for high precision position measurements
AssigneeAsylum Research Corporation
InventorsRoger Proksch, Jason Cleveland, Dan Bocek
Life of this patent
Estimating the term…
Abstract
A linear variable transformer (LVDT) for use in a transducer. The LVDT has a non-ferromagnetic core which may eliminate Barkhausen noise and thereby improve the sensitivity of the resulting measurements. In one aspect, this system may be used in an atomic force microscope.
Claims15
A position sensor, comprising:
- a moving coil part, having a first coil form that is constructed of a non ferromagnetic material, and a coil element having an electrical connection part, formed around said first coil form, said moving coil part constrained to move in a linear direction, and said moving coil part including a connection element adapted for connection to a moving object of interest;
- a stationary coil part, having a second coil form also constructed of a non ferromagnetic material, and a second coil element wound on said second coil form, with said second coil element having at least first and second electrical connections which produce an output signal indicative of a moving relationship between said moving coil part and said stationary coil part, said stationary coil part sufficiently close to said moving coil part such that magnetic flux from said moving coil part is induced into said stationary coil part, wherein said first and second coil forms are formed of solid, non-ferromagnetic material.
A position sensor, comprising:
- a moving coil part, having a first coil form formed of a non ferromagnetic solid material, and a coil element having an electrical connection part, formed around said first coil form, said moving coil part constrained to move in a linear direction, and said moving coil part including a connection element adapted for connection to a moving object of interest;
- and
- a stationary coil part, having a second coil form, also formed of a non ferromagnetic solid material, and a second coil element wound on said second coil form, with said second coil element having at least first and second electrical connections which produce an output signal indicative of a moving relationship between said moving coil part and said stationary coil part, said stationary coil part sufficiently close to said moving coil part such that magnetic flux from said moving coil part induces a current in said stationary coil part.
Dependencies are inferred from the claim text.