Inductive spool displacement sensor

Details Inductive spool displacement sensor Inductive spool displacement sensor

1998-12-28

2000-07-04

Pihulic, Daniel T.

Electricity: measuring and testing

Magnetic

Displacement

G01B 714

Patent

active

H00018546

ABSTRACT:
An inductive spool displacement sensor for determining the position or displacement of a spool within a particular hydraulic valve including a sensor housing having a cavity formed therein adapted for mounting within the hydraulic valve, the sensor housing being positioned such that at least a portion of the valve spool is disposed to enter the sensor cavity during certain operations of the valve. The sensor further includes a sensing coil wound about the housing cavity and a reference coil wound about the housing and spaced from the sensing coil, the inductance of the sensing coil being responsive to movement of the spool within the cavity and the inductance of the reference coil being responsive to the temperature of the fluid passing through the hydraulic valve. Based upon eddy current principles and because eddy currents are a function of material conductivity, the sensing coil, when energized, generates a signal indicative of that portion of the spool present within the housing cavity. Electronic circuitry, including a microprocessor, are coupled to the coils for receiving signals therefrom, the microprocessor determining the position of the spool relative to the cavity, or some other predetermined reference point, and outputting a signal proportional to the position or displacement of the spool within the hydraulic valve. The reference coil is provided to compensate for changing inductance values due to changing fluid temperature.

REFERENCES:
patent: 5244002 (1993-09-01), Frederick
patent: 5502378 (1996-03-01), Atteberry et al.
patent: 5518015 (1996-05-01), Berget et al.
patent: 5711507 (1998-01-01), Berget et al.

Affiliated with

Also associated with

Rating

Inductive spool displacement sensor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Inductive spool displacement sensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inductive spool displacement sensor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1474018